diff --git a/backend/app/api/v1/aes.py b/backend/app/api/v1/aes.py
index 4b661710..e7fccb54 100644
--- a/backend/app/api/v1/aes.py
+++ b/backend/app/api/v1/aes.py
@@ -44,6 +44,15 @@ def _is_overdue(ae: AERead) -> bool:
     return bool(ae.report_due_date and date.today() > ae.report_due_date and ae.status != "CLOSED")
 
 
+def _ae_audit_name(ae) -> str:
+    return str(getattr(ae, "term", "") or "").strip() or "AE 记录"
+
+
+def _ae_audit_detail(action: str, ae) -> str:
+    name = _ae_audit_name(ae)
+    return json.dumps({"targetName": name, "description": f"{action}AE“{name}”"}, ensure_ascii=False)
+
+
 @router.post(
     "/",
     response_model=AERead,
@@ -77,7 +86,7 @@ async def create_ae(
         entity_type="ae",
         entity_id=ae.id,
         action="CREATE_AE",
-        detail=f"AE {ae.id} 已创建",
+        detail=_ae_audit_detail("创建", ae),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -247,7 +256,16 @@ async def update_ae(
         entity_type="ae",
         entity_id=ae_id,
         action=action,
-        detail=json.dumps({"before": detail_before, "after": detail_after}, ensure_ascii=False, default=str),
+        detail=json.dumps(
+            {
+                "targetName": _ae_audit_name(updated),
+                "description": f"{'变更' if action == 'AE_STATUS_CHANGE' else '更新'}AE“{_ae_audit_name(updated)}”",
+                "before": detail_before,
+                "after": detail_after,
+            },
+            ensure_ascii=False,
+            default=str,
+        ),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -272,6 +290,7 @@ async def delete_ae(
     if not ae or ae.study_id != study_id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="AE 不存在")
     await _ensure_ae_visible(db, study_id, AERead.model_validate(ae))
+    ae_detail = _ae_audit_detail("删除", ae)
     await ae_crud.delete_ae(db, ae)
     await audit_crud.log_action(
         db,
@@ -279,7 +298,7 @@ async def delete_ae(
         entity_type="ae",
         entity_id=ae_id,
         action="DELETE_AE",
-        detail=f"AE {ae_id} 已删除",
+        detail=ae_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/audit_logs.py b/backend/app/api/v1/audit_logs.py
index 51cd39a3..dc6526ae 100644
--- a/backend/app/api/v1/audit_logs.py
+++ b/backend/app/api/v1/audit_logs.py
@@ -1,15 +1,34 @@
+import json
 import uuid
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.core.deps import get_operator_role_label, get_current_user, get_db_session, require_roles, require_api_permission
+from app.core.deps import get_operator_role_label, get_current_user, get_db_session, require_api_permission
 from app.crud import audit as audit_crud
+from app.crud import study as study_crud
 from app.schemas.audit import AuditEventCreate, AuditLogRead
 
 router = APIRouter()
 
 
+async def _build_export_audit_detail(db: AsyncSession, study_id: uuid.UUID, action: str) -> str:
+    study = await study_crud.get(db, study_id)
+    if not study:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="项目不存在")
+    scope = "system" if action == "AUDIT_EXPORT_SYSTEM" else "project"
+    description = "导出了系统审计日志" if scope == "system" else f"导出了项目审计日志：{study.name}"
+    return json.dumps(
+        {
+            "targetName": "系统审计日志" if scope == "system" else study.name,
+            "scope": scope,
+            "description": description,
+            "result": "SUCCESS",
+        },
+        ensure_ascii=False,
+    )
+
+
 @router.get(
     "/",
     response_model=list[AuditLogRead],
@@ -38,22 +57,6 @@ async def list_audit_logs(
     return list(logs)
 
 
-@router.delete(
-    "/{log_id}",
-    status_code=status.HTTP_204_NO_CONTENT,
-    dependencies=[Depends(require_roles(["ADMIN"]))],
-)
-async def delete_audit_log(
-    study_id: uuid.UUID,
-    log_id: uuid.UUID,
-    db: AsyncSession = Depends(get_db_session),
-):
-    log = await audit_crud.get_log(db, log_id)
-    if not log or log.study_id != study_id:
-        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="审计日志不存在")
-    await audit_crud.delete_log(db, log)
-
-
 @router.post(
     "/events",
     status_code=status.HTTP_201_CREATED,
@@ -71,10 +74,10 @@ async def create_audit_event(
     await audit_crud.log_action(
         db,
         study_id=study_id,
-        entity_type=payload.entity_type or "audit_log",
-        entity_id=payload.entity_id,
+        entity_type="audit_log",
+        entity_id=None,
         action=payload.action,
-        detail=payload.detail,
+        detail=await _build_export_audit_detail(db, study_id, payload.action),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/drug_shipments.py b/backend/app/api/v1/drug_shipments.py
index f38fca80..9604478d 100644
--- a/backend/app/api/v1/drug_shipments.py
+++ b/backend/app/api/v1/drug_shipments.py
@@ -23,6 +23,11 @@ def _shipment_audit_name(shipment) -> str:
     return shipment.tracking_no or shipment.batch_no or shipment.site_name or "药品运输记录"
 
 
+def _shipment_audit_description(action: str, shipment) -> str:
+    name = _shipment_audit_name(shipment)
+    return f"{action}药品流向“{name}”"
+
+
 async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
     study = await study_crud.get(db, study_id)
     if not study:
@@ -65,7 +70,7 @@ async def create_shipment(
         entity_id=shipment.id,
         action="CREATE_DRUG_SHIPMENT",
         detail=json.dumps(
-            {"targetName": _shipment_audit_name(shipment), "description": f"药品运输 {_shipment_audit_name(shipment)} 已创建"},
+            {"targetName": _shipment_audit_name(shipment), "description": _shipment_audit_description("创建", shipment)},
             ensure_ascii=False,
         ),
         operator_id=current_user.id,
@@ -178,7 +183,7 @@ async def update_shipment(
         entity_id=shipment_id,
         action="UPDATE_DRUG_SHIPMENT",
         detail=json.dumps(
-            {"targetName": _shipment_audit_name(shipment), "description": f"药品运输 {_shipment_audit_name(shipment)} 已更新"},
+            {"targetName": _shipment_audit_name(shipment), "description": _shipment_audit_description("更新", shipment)},
             ensure_ascii=False,
         ),
         operator_id=current_user.id,
@@ -214,7 +219,7 @@ async def delete_shipment(
         entity_type="drug_shipment",
         entity_id=shipment_id,
         action="DELETE_DRUG_SHIPMENT",
-        detail=json.dumps({"targetName": shipment_name, "description": f"药品运输 {shipment_name} 已删除"}, ensure_ascii=False),
+        detail=json.dumps({"targetName": shipment_name, "description": f"删除药品流向“{shipment_name}”"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/faq_categories.py b/backend/app/api/v1/faq_categories.py
index 4523beaa..355058bf 100644
--- a/backend/app/api/v1/faq_categories.py
+++ b/backend/app/api/v1/faq_categories.py
@@ -53,7 +53,7 @@ async def create_category(
         entity_type="faq_category",
         entity_id=category.id,
         action="CREATE_FAQ_CATEGORY",
-        detail=json.dumps({"targetName": category.name, "description": f"FAQ 分类 {category.name} 已创建"}, ensure_ascii=False),
+        detail=json.dumps({"targetName": category.name, "description": f"创建“{category.name}”分类"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, payload.study_id, current_user),
     )
@@ -118,7 +118,7 @@ async def update_category(
         entity_type="faq_category",
         entity_id=category_id,
         action="UPDATE_FAQ_CATEGORY",
-        detail=json.dumps({"targetName": updated.name, "description": f"FAQ 分类 {updated.name} 已更新"}, ensure_ascii=False),
+        detail=json.dumps({"targetName": updated.name, "description": f"更新“{updated.name}”分类"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, updated.study_id, current_user),
     )
@@ -157,7 +157,7 @@ async def delete_category(
         entity_type="faq_category",
         entity_id=category_id,
         action="DELETE_FAQ_CATEGORY",
-        detail=json.dumps({"targetName": category_name, "description": f"FAQ 分类 {category_name} 已删除"}, ensure_ascii=False),
+        detail=json.dumps({"targetName": category_name, "description": f"删除“{category_name}”分类"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, category.study_id, current_user),
     )
diff --git a/backend/app/api/v1/faqs.py b/backend/app/api/v1/faqs.py
index b36f1c49..6f7f72af 100644
--- a/backend/app/api/v1/faqs.py
+++ b/backend/app/api/v1/faqs.py
@@ -1,3 +1,4 @@
+import json
 import uuid
 
 from fastapi import APIRouter, Depends, HTTPException, status
@@ -30,6 +31,13 @@ def _is_system_admin(current_user) -> bool:
     return is_system_admin(current_user)
 
 
+def _compact_text(value: str | None, max_length: int = 40) -> str:
+    text = " ".join(str(value or "").split())
+    if len(text) <= max_length:
+        return text
+    return f"{text[:max_length]}..."
+
+
 @router.post(
     "/",
     response_model=FaqRead,
@@ -66,13 +74,14 @@ async def create_faq(
             reply_in=FaqReplyCreate(content=payload.answer),
         )
         await faq_crud.set_status(db, item.id, "PROCESSING")
+    question_name = _compact_text(item.question)
     await audit_crud.log_action(
         db,
         study_id=payload.study_id,
         entity_type="faq_item",
         entity_id=item.id,
         action="CREATE_FAQ_ITEM",
-        detail="FAQ 已创建",
+        detail=json.dumps({"targetName": question_name, "description": f"创建医学咨询问题“{question_name}”"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, payload.study_id, current_user),
     )
@@ -170,7 +179,8 @@ async def update_faq(
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="FAQ 不存在")
     updated = await faq_crud.update_item(db, item, payload)
     action = "UPDATE_FAQ_ITEM"
-    detail = "FAQ updated"
+    question_name = _compact_text(updated.question)
+    detail = json.dumps({"targetName": question_name, "description": f"更新医学咨询问题“{question_name}”"}, ensure_ascii=False)
     await audit_crud.log_action(
         db,
         study_id=item.study_id,
@@ -327,13 +337,14 @@ async def create_reply(
     if item.status != "RESOLVED":
         await faq_crud.set_status(db, item.id, "PROCESSING")
     await faq_crud.touch_item(db, item.id)
+    question_name = _compact_text(item.question)
     await audit_crud.log_action(
         db,
         study_id=item.study_id,
         entity_type="faq_reply",
         entity_id=reply.id,
         action="CREATE_FAQ_REPLY",
-        detail="FAQ 已回复",
+        detail=json.dumps({"targetName": question_name, "description": f"回复医学咨询问题“{question_name}”"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, item.study_id, current_user),
     )
@@ -369,6 +380,7 @@ async def delete_faq(
     item = await faq_crud.get_item(db, item_id)
     if not item:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="FAQ 不存在")
+    question_name = _compact_text(item.question)
     await reply_crud.delete_replies_by_faq_id(db, item.id)
     await db.delete(item)
     await db.commit()
@@ -378,7 +390,7 @@ async def delete_faq(
         entity_type="faq_item",
         entity_id=item_id,
         action="DELETE_FAQ_ITEM",
-        detail="FAQ 已删除",
+        detail=json.dumps({"targetName": question_name, "description": f"删除医学咨询问题“{question_name}”"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, item.study_id, current_user),
     )
@@ -403,6 +415,7 @@ async def delete_reply(
     item = await faq_crud.get_item(db, item_id)
     if not item:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="FAQ 不存在")
+    question_name = _compact_text(item.question)
     reply = await reply_crud.get_reply(db, reply_id)
     if not reply or reply.faq_id != item.id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="回复不存在")
@@ -431,7 +444,7 @@ async def delete_reply(
         entity_type="faq_reply",
         entity_id=reply_id,
         action="DELETE_FAQ_REPLY",
-        detail="FAQ 回复已删除",
+        detail=json.dumps({"targetName": question_name, "description": f"删除医学咨询问题“{question_name}”的回复"}, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, item.study_id, current_user),
     )
diff --git a/backend/app/api/v1/fees_contracts.py b/backend/app/api/v1/fees_contracts.py
index ddbb12a1..5924dd56 100644
--- a/backend/app/api/v1/fees_contracts.py
+++ b/backend/app/api/v1/fees_contracts.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 from decimal import Decimal
 from typing import Any
 
@@ -52,6 +53,34 @@ async def _ensure_center_active(db: AsyncSession, study_id: uuid.UUID, center_id
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="中心已停用")
 
 
+async def _contract_audit_name(db: AsyncSession, contract) -> str:
+    site = await site_crud.get_site(db, contract.center_id)
+    center_name = site.name if site else "中心"
+    contract_no = str(contract.contract_no or "").strip()
+    return f"{center_name} / {contract_no}" if contract_no else center_name
+
+
+async def _contract_audit_detail(db: AsyncSession, action: str, contract) -> str:
+    name = await _contract_audit_name(db, contract)
+    return json.dumps({"targetName": name, "description": f"{action}合同费用“{name}”"}, ensure_ascii=False)
+
+
+async def _payment_audit_name(db: AsyncSession, contract, payment) -> str:
+    contract_name = await _contract_audit_name(db, contract)
+    seq = getattr(payment, "seq", None)
+    amount = getattr(payment, "amount", None)
+    if seq:
+        return f"{contract_name} / 第{seq}期"
+    if amount is not None:
+        return f"{contract_name} / {amount}"
+    return contract_name
+
+
+async def _payment_audit_detail(db: AsyncSession, action: str, contract, payment) -> str:
+    name = await _payment_audit_name(db, contract, payment)
+    return json.dumps({"targetName": name, "description": f"{action}合同费用分期“{name}”"}, ensure_ascii=False)
+
+
 def _parse_optional_uuid(value: str | None, detail: str) -> uuid.UUID | None:
     if not value:
         return None
@@ -261,7 +290,7 @@ async def create_contract_fee(
         entity_type="contract_fee",
         entity_id=contract.id,
         action="CREATE_CONTRACT_FEE",
-        detail="合同费用已创建",
+        detail=await _contract_audit_detail(db, "创建", contract),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
@@ -291,7 +320,7 @@ async def update_contract_fee(
         entity_type="contract_fee",
         entity_id=contract_id,
         action="UPDATE_CONTRACT_FEE",
-        detail="合同费用已更新",
+        detail=await _contract_audit_detail(db, "更新", contract),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
@@ -313,6 +342,7 @@ async def delete_contract_fee(
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="合同费用不存在")
     await _ensure_study_access(db, contract.study_id, current_user, "fees_contracts:delete")
     await _ensure_center_active(db, contract.study_id, contract.center_id)
+    contract_detail = await _contract_audit_detail(db, "删除", contract)
     await contract_fee_crud.delete_contract_fee(db, contract)
     await audit_crud.log_action(
         db,
@@ -320,7 +350,7 @@ async def delete_contract_fee(
         entity_type="contract_fee",
         entity_id=contract_id,
         action="DELETE_CONTRACT_FEE",
-        detail="合同费用已删除",
+        detail=contract_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
@@ -350,7 +380,7 @@ async def create_contract_payment(
         entity_type="contract_fee_payment",
         entity_id=payment.id,
         action="CREATE_CONTRACT_FEE_PAYMENT",
-        detail="合同费用分期已创建",
+        detail=await _payment_audit_detail(db, "创建", contract, payment),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
@@ -391,7 +421,7 @@ async def update_contract_payment(
         entity_type="contract_fee_payment",
         entity_id=payment_id,
         action="UPDATE_CONTRACT_FEE_PAYMENT",
-        detail="合同费用分期已更新",
+        detail=await _payment_audit_detail(db, "更新", contract, payment),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
@@ -415,6 +445,7 @@ async def delete_contract_payment(
     if not contract:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="合同费用不存在")
     await _ensure_study_access(db, contract.study_id, current_user, "fees_contracts:update")
+    payment_detail = await _payment_audit_detail(db, "删除", contract, payment)
     await payment_crud.delete_payment(db, payment)
     await payment_crud.resequence_payments(db, contract.id)
     await audit_crud.log_action(
@@ -423,7 +454,7 @@ async def delete_contract_payment(
         entity_type="contract_fee_payment",
         entity_id=payment_id,
         action="DELETE_CONTRACT_FEE_PAYMENT",
-        detail="合同费用分期已删除",
+        detail=payment_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, contract.study_id, current_user),
     )
diff --git a/backend/app/api/v1/material_equipments.py b/backend/app/api/v1/material_equipments.py
index 7a8b87e0..ab9df610 100644
--- a/backend/app/api/v1/material_equipments.py
+++ b/backend/app/api/v1/material_equipments.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -24,6 +25,18 @@ def _validate_calibration(need_calibration: bool, calibration_cycle_days: int |
         raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail="需要校准时校准周期必须大于0")
 
 
+def _equipment_audit_name(item) -> str:
+    parts = [item.name, item.spec_model, item.brand]
+    return " / ".join(str(part).strip() for part in parts if str(part or "").strip()) or "设备记录"
+
+
+def _equipment_audit_detail(action: str, item) -> str:
+    return json.dumps(
+        {"targetName": _equipment_audit_name(item), "description": f"{action}设备“{_equipment_audit_name(item)}”"},
+        ensure_ascii=False,
+    )
+
+
 @router.post(
     "/equipment",
     response_model=MaterialEquipmentRead,
@@ -47,7 +60,7 @@ async def create_equipment(
         entity_type="material_equipment",
         entity_id=item.id,
         action="CREATE_MATERIAL_EQUIPMENT",
-        detail=f"设备 {item.id} 已创建",
+        detail=_equipment_audit_detail("创建", item),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -118,7 +131,7 @@ async def update_equipment(
         entity_type="material_equipment",
         entity_id=equipment_id,
         action="UPDATE_MATERIAL_EQUIPMENT",
-        detail=f"设备 {equipment_id} 已更新",
+        detail=_equipment_audit_detail("更新", item),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -140,6 +153,7 @@ async def delete_equipment(
     item = await equipment_crud.get_equipment(db, equipment_id)
     if not item or item.study_id != study_id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="设备记录不存在")
+    equipment_detail = _equipment_audit_detail("删除", item)
     await equipment_crud.delete_equipment(db, item)
     await audit_crud.log_action(
         db,
@@ -147,7 +161,7 @@ async def delete_equipment(
         entity_type="material_equipment",
         entity_id=equipment_id,
         action="DELETE_MATERIAL_EQUIPMENT",
-        detail=f"设备 {equipment_id} 已删除",
+        detail=equipment_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/members.py b/backend/app/api/v1/members.py
index e4de7b0f..1fe0a0b5 100644
--- a/backend/app/api/v1/members.py
+++ b/backend/app/api/v1/members.py
@@ -43,6 +43,20 @@ def _role_rank(role: str | None) -> int:
     return PROJECT_ROLE_RANK.get(role or "", 0)
 
 
+def _user_audit_name(user, user_id: uuid.UUID) -> str:
+    if user:
+        for attr in ("full_name", "username", "email"):
+            value = getattr(user, attr, None)
+            if value:
+                return str(value)
+    return str(user_id)
+
+
+async def _member_audit_name(db: AsyncSession, user_id: uuid.UUID) -> str:
+    user = await user_crud.get_by_id(db, user_id)
+    return _user_audit_name(user, user_id)
+
+
 async def _ensure_member_mutation_allowed(
     db: AsyncSession,
     study_id: uuid.UUID,
@@ -116,7 +130,7 @@ async def add_member(
                 entity_id=updated.id,
                 action="PROJECT_MEMBER_UPDATED",
                 detail=json.dumps({
-                    "targetName": str(updated.user_id),
+                    "targetName": await _member_audit_name(db, updated.user_id),
                     "before": {"is_active": existing.is_active, "role_in_study": existing.role_in_study},
                     "after": {"is_active": updated.is_active, "role_in_study": updated.role_in_study},
                 }, ensure_ascii=False),
@@ -132,7 +146,10 @@ async def add_member(
         entity_type="study_member",
         entity_id=member.id,
         action="PROJECT_MEMBER_ADDED",
-        detail=json.dumps({"targetName": str(member.user_id), "after": {"role_in_study": member.role_in_study, "is_active": member.is_active}}, ensure_ascii=False),
+        detail=json.dumps({
+            "targetName": await _member_audit_name(db, member.user_id),
+            "after": {"role_in_study": member.role_in_study, "is_active": member.is_active},
+        }, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await _operator_project_role(db, study_id, current_user),
     )
@@ -247,7 +264,11 @@ async def update_member(
         entity_type="study_member",
         entity_id=updated.id,
         action="PROJECT_MEMBER_UPDATED",
-        detail=json.dumps({"targetName": str(updated.user_id), "before": before_data, "after": after_data}, ensure_ascii=False),
+        detail=json.dumps({
+            "targetName": await _member_audit_name(db, updated.user_id),
+            "before": before_data,
+            "after": after_data,
+        }, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await _operator_project_role(db, study_id, current_user),
     )
@@ -288,7 +309,11 @@ async def remove_member(
         entity_type="study_member",
         entity_id=removed.id,
         action="PROJECT_MEMBER_REMOVED",
-        detail=json.dumps({"targetName": str(removed.user_id), "before": before_data, "after": {"is_active": removed.is_active}}, ensure_ascii=False),
+        detail=json.dumps({
+            "targetName": _user_audit_name(target_user, removed.user_id),
+            "before": before_data,
+            "after": {"is_active": removed.is_active},
+        }, ensure_ascii=False),
         operator_id=current_user.id,
         operator_role=await _operator_project_role(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/precautions.py b/backend/app/api/v1/precautions.py
index 3c06770f..38ed964b 100644
--- a/backend/app/api/v1/precautions.py
+++ b/backend/app/api/v1/precautions.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -28,6 +29,11 @@ async def _ensure_site_name_active(db: AsyncSession, study_id: uuid.UUID, site_n
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="中心已停用")
 
 
+def _precaution_audit_detail(action: str, precaution) -> str:
+    title = str(precaution.title or "").strip() or "注意事项"
+    return json.dumps({"targetName": title, "description": f"{action}注意事项“{title}”"}, ensure_ascii=False)
+
+
 @router.post(
     "/precautions",
     response_model=PrecautionRead,
@@ -49,7 +55,7 @@ async def create_precaution(
         entity_type="precaution",
         entity_id=precaution.id,
         action="CREATE_PRECAUTION",
-        detail=f"注意事项 {precaution.title} 已创建",
+        detail=_precaution_audit_detail("创建", precaution),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -115,7 +121,7 @@ async def update_precaution(
         entity_type="precaution",
         entity_id=precaution_id,
         action="UPDATE_PRECAUTION",
-        detail=f"注意事项 {precaution_id} 已更新",
+        detail=_precaution_audit_detail("更新", precaution),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -138,6 +144,7 @@ async def delete_precaution(
     if not precaution or precaution.study_id != study_id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="注意事项不存在")
     await _ensure_site_name_active(db, study_id, precaution.site_name)
+    precaution_detail = _precaution_audit_detail("删除", precaution)
     await precaution_crud.delete_precaution(db, precaution)
     await audit_crud.log_action(
         db,
@@ -145,7 +152,7 @@ async def delete_precaution(
         entity_type="precaution",
         entity_id=precaution_id,
         action="DELETE_PRECAUTION",
-        detail=f"注意事项 {precaution_id} 已删除",
+        detail=precaution_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/startup.py b/backend/app/api/v1/startup.py
index dc145e04..6a9ff7ee 100644
--- a/backend/app/api/v1/startup.py
+++ b/backend/app/api/v1/startup.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -49,6 +50,41 @@ async def _ensure_site_active(db: AsyncSession, site_id: uuid.UUID | None):
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="中心已停用")
 
 
+async def _site_label(db: AsyncSession, site_id: uuid.UUID | None, fallback: str = "项目级") -> str:
+    if not site_id:
+        return fallback
+    site = await site_crud.get_site(db, site_id)
+    return site.name if site else fallback
+
+
+async def _feasibility_audit_detail(db: AsyncSession, action: str, record) -> str:
+    site_name = await _site_label(db, record.site_id)
+    project_no = str(record.project_no or "").strip()
+    name = f"{site_name} / {project_no}" if project_no else site_name
+    return json.dumps({"targetName": name, "description": f"{action}立项记录“{name}”"}, ensure_ascii=False)
+
+
+async def _ethics_audit_detail(db: AsyncSession, action: str, record) -> str:
+    site_name = await _site_label(db, record.site_id)
+    approval_no = str(record.approval_no or "").strip()
+    name = f"{site_name} / {approval_no}" if approval_no else site_name
+    return json.dumps({"targetName": name, "description": f"{action}伦理记录“{name}”"}, ensure_ascii=False)
+
+
+async def _kickoff_audit_detail(db: AsyncSession, action: str, meeting) -> str:
+    site_name = await _site_label(db, meeting.site_id)
+    date_text = meeting.kickoff_date.isoformat() if meeting.kickoff_date else ""
+    name = f"{site_name} / {date_text}" if date_text else site_name
+    return json.dumps({"targetName": name, "description": f"{action}启动会记录“{name}”"}, ensure_ascii=False)
+
+
+def _training_audit_detail(action: str, record) -> str:
+    name = str(record.name or "").strip() or "培训授权人员"
+    site_name = str(record.site_name or "").strip()
+    target_name = f"{name} / {site_name}" if site_name else name
+    return json.dumps({"targetName": target_name, "description": f"{action}培训授权人员“{target_name}”"}, ensure_ascii=False)
+
+
 @router.post(
     "/feasibility",
     response_model=StartupFeasibilityRead,
@@ -73,7 +109,7 @@ async def create_feasibility(
         entity_type="startup_feasibility",
         entity_id=record.id,
         action="CREATE_STARTUP_FEASIBILITY",
-        detail="立项记录已创建",
+        detail=await _feasibility_audit_detail(db, "创建", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -147,7 +183,7 @@ async def update_feasibility(
         entity_type="startup_feasibility",
         entity_id=record_id,
         action="UPDATE_STARTUP_FEASIBILITY",
-        detail="立项记录已更新",
+        detail=await _feasibility_audit_detail(db, "更新", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -173,6 +209,7 @@ async def delete_feasibility(
     if cra_scope and record.site_id not in cra_scope[0]:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
     await _ensure_site_active(db, record.site_id)
+    record_detail = await _feasibility_audit_detail(db, "删除", record)
     await startup_crud.delete_feasibility(db, record)
     await audit_crud.log_action(
         db,
@@ -180,7 +217,7 @@ async def delete_feasibility(
         entity_type="startup_feasibility",
         entity_id=record_id,
         action="DELETE_STARTUP_FEASIBILITY",
-        detail="立项记录已删除",
+        detail=record_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -210,7 +247,7 @@ async def create_ethics(
         entity_type="startup_ethics",
         entity_id=record.id,
         action="CREATE_STARTUP_ETHICS",
-        detail="伦理记录已创建",
+        detail=await _ethics_audit_detail(db, "创建", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -284,7 +321,7 @@ async def update_ethics(
         entity_type="startup_ethics",
         entity_id=record_id,
         action="UPDATE_STARTUP_ETHICS",
-        detail="伦理记录已更新",
+        detail=await _ethics_audit_detail(db, "更新", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -310,6 +347,7 @@ async def delete_ethics(
     if cra_scope and record.site_id not in cra_scope[0]:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
     await _ensure_site_active(db, record.site_id)
+    record_detail = await _ethics_audit_detail(db, "删除", record)
     await startup_crud.delete_ethics(db, record)
     await audit_crud.log_action(
         db,
@@ -317,7 +355,7 @@ async def delete_ethics(
         entity_type="startup_ethics",
         entity_id=record_id,
         action="DELETE_STARTUP_ETHICS",
-        detail="伦理记录已删除",
+        detail=record_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -347,7 +385,7 @@ async def create_kickoff(
         entity_type="startup_kickoff",
         entity_id=meeting.id,
         action="CREATE_KICKOFF_MEETING",
-        detail="启动会记录已创建",
+        detail=await _kickoff_audit_detail(db, "创建", meeting),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -421,7 +459,7 @@ async def update_kickoff(
         entity_type="startup_kickoff",
         entity_id=meeting_id,
         action="UPDATE_KICKOFF_MEETING",
-        detail="启动会记录已更新",
+        detail=await _kickoff_audit_detail(db, "更新", meeting),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -452,7 +490,7 @@ async def create_training_authorization(
         entity_type="training_authorization",
         entity_id=record.id,
         action="CREATE_TRAINING_AUTH",
-        detail="培训授权人员已创建",
+        detail=_training_audit_detail("创建", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -527,7 +565,7 @@ async def update_training_authorization(
         entity_type="training_authorization",
         entity_id=record_id,
         action="UPDATE_TRAINING_AUTH",
-        detail="培训授权人员已更新",
+        detail=_training_audit_detail("更新", record),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -553,6 +591,7 @@ async def delete_training_authorization(
     if cra_scope and record.site_name not in cra_scope[1]:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
     await _ensure_site_name_active(db, study_id, record.site_name)
+    record_detail = _training_audit_detail("删除", record)
     await startup_crud.delete_training_authorization(db, record)
     await audit_crud.log_action(
         db,
@@ -560,7 +599,7 @@ async def delete_training_authorization(
         entity_type="training_authorization",
         entity_id=record_id,
         action="DELETE_TRAINING_AUTH",
-        detail="培训授权人员已删除",
+        detail=record_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/studies.py b/backend/app/api/v1/studies.py
index e0bba359..491c097e 100644
--- a/backend/app/api/v1/studies.py
+++ b/backend/app/api/v1/studies.py
@@ -610,7 +610,6 @@ _SETUP_MODULE_LABELS = {
 }
 
 _SETUP_FIELD_LABELS = {
-    "id": "ID",
     "name": "名称",
     "milestone": "里程碑",
     "planDate": "计划日期",
@@ -634,6 +633,8 @@ _SETUP_FIELD_LABELS = {
     "confirmDate": "确认日期",
 }
 
+_SETUP_TECHNICAL_FIELDS = {"id"}
+
 
 def _setup_value_text(value: Any) -> str:
     if value is None:
@@ -690,6 +691,8 @@ def _setup_collect_diff_lines(
         new_dict = new_value if isinstance(new_value, dict) else {}
         keys = sorted(set(old_dict.keys()) | set(new_dict.keys()))
         for key in keys:
+            if key in _SETUP_TECHNICAL_FIELDS:
+                continue
             _setup_collect_diff_lines(module_key, old_dict.get(key), new_dict.get(key), [*path, key], lines)
         return
 
@@ -718,11 +721,7 @@ def _top_level_diff_summary(old: dict | None, new: dict | None) -> str:
     if not detail_lines:
         return module_summary
 
-    max_lines = 20
-    visible_lines = detail_lines[:max_lines]
-    if len(detail_lines) > max_lines:
-        visible_lines.append(f"其余 {len(detail_lines) - max_lines} 项变更已省略")
-    return f"{module_summary}; 变更明细：" + "；".join(visible_lines)
+    return f"{module_summary}; 变更明细：" + "；".join(detail_lines)
 
 
 @router.post("/", response_model=StudyRead, status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_roles(["ADMIN"]))])
diff --git a/backend/app/api/v1/subject_histories.py b/backend/app/api/v1/subject_histories.py
index 33ad91f0..fd51fa60 100644
--- a/backend/app/api/v1/subject_histories.py
+++ b/backend/app/api/v1/subject_histories.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -14,6 +15,26 @@ from app.schemas.subject_history import SubjectHistoryCreate, SubjectHistoryRead
 router = APIRouter()
 
 
+def _compact_text(value: str | None, max_length: int = 30) -> str:
+    text = " ".join(str(value or "").split())
+    if len(text) <= max_length:
+        return text
+    return f"{text[:max_length]}..."
+
+
+def _history_audit_name(subject, history) -> str:
+    subject_no = getattr(subject, "subject_no", None) or "参与者"
+    record_date = getattr(history, "record_date", None)
+    content = _compact_text(getattr(history, "content", None))
+    suffix = record_date.isoformat() if record_date else content
+    return f"{subject_no} / {suffix}" if suffix else subject_no
+
+
+def _history_audit_detail(action: str, subject, history) -> str:
+    name = _history_audit_name(subject, history)
+    return json.dumps({"targetName": name, "description": f"{action}病史记录“{name}”"}, ensure_ascii=False)
+
+
 async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
     study = await study_crud.get(db, study_id)
     if not study:
@@ -56,7 +77,7 @@ async def create_history(
         entity_type="subject_history",
         entity_id=history.id,
         action="CREATE_SUBJECT_HISTORY",
-        detail="病史记录已创建",
+        detail=_history_audit_detail("创建", subject, history),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -131,7 +152,7 @@ async def update_history(
         entity_type="subject_history",
         entity_id=history_id,
         action="UPDATE_SUBJECT_HISTORY",
-        detail="病史记录已更新",
+        detail=_history_audit_detail("更新", subject, history),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -157,6 +178,7 @@ async def delete_history(
     history = await history_crud.get_history(db, history_id)
     if not history or history.study_id != study_id or history.subject_id != subject_id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="病史记录不存在")
+    history_detail = _history_audit_detail("删除", subject, history)
     await history_crud.delete_history(db, history)
     await audit_crud.log_action(
         db,
@@ -164,7 +186,7 @@ async def delete_history(
         entity_type="subject_history",
         entity_id=history_id,
         action="DELETE_SUBJECT_HISTORY",
-        detail="病史记录已删除",
+        detail=history_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/subjects.py b/backend/app/api/v1/subjects.py
index 57cac496..33c9381f 100644
--- a/backend/app/api/v1/subjects.py
+++ b/backend/app/api/v1/subjects.py
@@ -1,3 +1,4 @@
+import json
 import uuid
 
 from fastapi import APIRouter, Depends, HTTPException, status
@@ -15,6 +16,29 @@ from app.schemas.subject import SubjectCreate, SubjectRead, SubjectUpdate
 router = APIRouter()
 
 
+def _format_date(value):
+    return value.isoformat() if value else None
+
+
+async def _subject_audit_snapshot(db: AsyncSession, subject) -> dict:
+    site_name = None
+    if subject.site_id:
+        site = await site_crud.get_site(db, subject.site_id)
+        site_name = site.name if site else None
+    return {
+        "subject_no": subject.subject_no,
+        "site_name": site_name,
+        "status": subject.status,
+        "screening_date": _format_date(subject.screening_date),
+        "consent_date": _format_date(subject.consent_date),
+        "enrollment_date": _format_date(subject.enrollment_date),
+        "baseline_date": _format_date(subject.baseline_date),
+        "completion_date": _format_date(subject.completion_date),
+        "actual_medication_count": subject.actual_medication_count,
+        "drop_reason": subject.drop_reason,
+    }
+
+
 async def _ensure_study_exists(db: AsyncSession, study_id: uuid.UUID):
     study = await study_crud.get(db, study_id)
     if not study:
@@ -50,13 +74,22 @@ async def create_subject(
         subject = await subject_crud.create_subject(db, study_id, subject_in)
     except ValueError as exc:
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(exc)) from exc
+    after_snapshot = await _subject_audit_snapshot(db, subject)
     await audit_crud.log_action(
         db,
         study_id=study_id,
         entity_type="subject",
         entity_id=subject.id,
         action="CREATE_SUBJECT",
-        detail=f"参与者 {subject.subject_no} 已创建",
+        detail=json.dumps(
+            {
+                "targetName": subject.subject_no,
+                "description": f"创建参与者 {subject.subject_no}",
+                "before": None,
+                "after": after_snapshot,
+            },
+            ensure_ascii=False,
+        ),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -172,21 +205,29 @@ async def update_subject(
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
     await _ensure_subject_active(db, subject)
     old_status = subject.status
+    before_snapshot = await _subject_audit_snapshot(db, subject)
     updated = await subject_crud.update_subject(db, subject, subject_in)
     # 基线/治疗日期是访视计划的唯一推算基准，不能用入组日期替代。
     if updated.baseline_date:
         await subject_crud.sync_visits_from_baseline(db, updated)
         updated = await subject_crud.sync_subject_status(db, updated)
-    detail = None
-    if updated.status != old_status:
-        detail = f"参与者 {updated.subject_no} 状态 {old_status} -> {updated.status}"
+    after_snapshot = await _subject_audit_snapshot(db, updated)
+    description = f"变更参与者 {updated.subject_no} 状态" if updated.status != old_status else f"更新参与者 {updated.subject_no}"
     await audit_crud.log_action(
         db,
         study_id=study_id,
         entity_type="subject",
         entity_id=subject_id,
-        action="SUBJECT_STATUS_CHANGE" if detail else "UPDATE_SUBJECT",
-        detail=detail or "参与者已更新",
+        action="SUBJECT_STATUS_CHANGE" if updated.status != old_status else "UPDATE_SUBJECT",
+        detail=json.dumps(
+            {
+                "targetName": updated.subject_no,
+                "description": description,
+                "before": before_snapshot,
+                "after": after_snapshot,
+            },
+            ensure_ascii=False,
+        ),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -211,6 +252,8 @@ async def delete_subject(
     cra_scope = await get_cra_site_scope(db, study_id, current_user)
     if cra_scope and subject.site_id not in cra_scope[0]:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="权限不足")
+    before_snapshot = await _subject_audit_snapshot(db, subject)
+    target_name = subject.subject_no
     await subject_crud.delete_subject(db, subject)
     await audit_crud.log_action(
         db,
@@ -218,7 +261,15 @@ async def delete_subject(
         entity_type="subject",
         entity_id=subject_id,
         action="DELETE_SUBJECT",
-        detail=f"参与者 {subject_id} 已删除",
+        detail=json.dumps(
+            {
+                "targetName": target_name,
+                "description": f"删除参与者 {target_name}",
+                "before": before_snapshot,
+                "after": None,
+            },
+            ensure_ascii=False,
+        ),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/api/v1/visits.py b/backend/app/api/v1/visits.py
index 78f1c12c..553f1d70 100644
--- a/backend/app/api/v1/visits.py
+++ b/backend/app/api/v1/visits.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 
 from fastapi import APIRouter, Depends, HTTPException, status
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -15,6 +16,17 @@ from app.schemas.visit import EarlyTerminationCreate, VisitCreate, VisitRead, Vi
 router = APIRouter()
 
 
+def _visit_audit_name(subject, visit) -> str:
+    subject_no = getattr(subject, "subject_no", None) or "参与者"
+    visit_code = getattr(visit, "visit_code", None) or "访视"
+    return f"{subject_no} / {visit_code}"
+
+
+def _visit_audit_detail(action: str, subject, visit) -> str:
+    name = _visit_audit_name(subject, visit)
+    return json.dumps({"targetName": name, "description": f"{action}访视“{name}”"}, ensure_ascii=False)
+
+
 async def _ensure_subject(db: AsyncSession, study_id: uuid.UUID, subject_id: uuid.UUID):
     subject = await subject_crud.get_subject(db, subject_id)
     if not subject or subject.study_id != study_id:
@@ -105,7 +117,7 @@ async def create_visit(
         entity_type="visit",
         entity_id=visit.id,
         action="CREATE_VISIT",
-        detail=f"访视 {visit.visit_code} 已创建",
+        detail=_visit_audit_detail("创建", subject, visit),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -158,7 +170,10 @@ async def create_early_termination(
         entity_type="visit",
         entity_id=visit.id,
         action="CREATE_EARLY_TERMINATION",
-        detail=f"参与者 {subject.subject_no} 已提前终止",
+        detail=json.dumps(
+            {"targetName": subject.subject_no, "description": f"创建参与者 {subject.subject_no} 提前终止访视"},
+            ensure_ascii=False,
+        ),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -191,18 +206,27 @@ async def update_visit(
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="实际访视日期不能早于访视窗口开始日期")
     if visit_in.actual_date and visit.window_end and visit_in.actual_date > visit.window_end:
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="实际访视日期不能晚于访视窗口结束日期")
+    old_status = visit.status
     updated = await visit_crud.update_visit(db, visit, visit_in)
     await subject_crud.sync_subject_status(db, subject)
     detail = None
     if visit_in.status:
-        detail = f"访视 {visit.visit_code} {visit.status} -> {visit_in.status}"
+        detail = json.dumps(
+            {
+                "targetName": _visit_audit_name(subject, updated),
+                "description": f"变更访视“{_visit_audit_name(subject, updated)}”状态",
+                "before": {"status": old_status},
+                "after": {"status": visit_in.status},
+            },
+            ensure_ascii=False,
+        )
     await audit_crud.log_action(
         db,
         study_id=study_id,
         entity_type="visit",
         entity_id=visit_id,
         action="VISIT_STATUS_CHANGE" if detail else "UPDATE_VISIT",
-        detail=detail or "访视已更新",
+        detail=detail or _visit_audit_detail("更新", subject, updated),
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
@@ -226,6 +250,7 @@ async def delete_visit(
     visit = await visit_crud.get_visit(db, visit_id)
     if not visit or visit.subject_id != subject_id or visit.study_id != study_id:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="访视不存在")
+    visit_detail = _visit_audit_detail("删除", subject, visit)
     await visit_crud.delete_visit(db, visit)
     await subject_crud.sync_subject_status(db, subject)
     await audit_crud.log_action(
@@ -234,7 +259,7 @@ async def delete_visit(
         entity_type="visit",
         entity_id=visit_id,
         action="DELETE_VISIT",
-        detail=f"访视 {visit_id} 已删除",
+        detail=visit_detail,
         operator_id=current_user.id,
         operator_role=await get_operator_role_label(db, study_id, current_user),
     )
diff --git a/backend/app/crud/audit.py b/backend/app/crud/audit.py
index 6f71dc02..4581098e 100644
--- a/backend/app/crud/audit.py
+++ b/backend/app/crud/audit.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import uuid
 from typing import Sequence
 
@@ -65,8 +67,3 @@ async def list_logs(
 async def get_log(db: AsyncSession, log_id: uuid.UUID) -> AuditLog | None:
     result = await db.execute(select(AuditLog).where(AuditLog.id == log_id))
     return result.scalar_one_or_none()
-
-
-async def delete_log(db: AsyncSession, log: AuditLog) -> None:
-    await db.delete(log)
-    await db.commit()
diff --git a/backend/app/crud/study.py b/backend/app/crud/study.py
index e8cae9ee..6acc093a 100644
--- a/backend/app/crud/study.py
+++ b/backend/app/crud/study.py
@@ -121,11 +121,10 @@ async def delete(db: AsyncSession, study_id: uuid.UUID) -> None:
     from app.models.study_monitoring_strategy import StudyMonitoringStrategy
     from app.models.study_center_confirm import StudyCenterConfirm
     
-    # 按依赖关系顺序删除关联数据
-    # 1. 删除审计日志
-    await db.execute(sa_delete(AuditLog).where(AuditLog.study_id == study_id))
+    # 按依赖关系顺序删除关联数据。审计日志必须保留，只解除项目外键，避免硬删除项目时破坏审计链。
+    await db.execute(sa_update(AuditLog).where(AuditLog.study_id == study_id).values(study_id=None))
     
-    # 2. 删除FAQ相关（可能有依赖关系）
+    # 1. 删除FAQ相关（可能有依赖关系）
     await db.execute(sa_delete(FaqReply).where(FaqReply.study_id == study_id))
     await db.execute(sa_delete(FaqItem).where(FaqItem.study_id == study_id))
     await db.execute(sa_delete(FaqCategory).where(FaqCategory.study_id == study_id))
diff --git a/backend/app/services/document_service.py b/backend/app/services/document_service.py
index 4d8c71ca..8c459631 100644
--- a/backend/app/services/document_service.py
+++ b/backend/app/services/document_service.py
@@ -56,23 +56,25 @@ def _audit_detail(before: dict | None, after: dict | None) -> str:
 
 
 def _doc_snapshot(doc: Document) -> dict:
+    status = doc.status.value if hasattr(doc.status, "value") else str(doc.status)
     return {
         "id": str(doc.id),
         "trial_id": str(doc.trial_id),
         "site_id": str(doc.site_id) if doc.site_id else None,
         "etmf_node_id": str(doc.etmf_node_id) if doc.etmf_node_id else None,
         "doc_no": doc.doc_no,
-        "status": str(doc.status),
+        "status": status,
         "current_effective_version_id": str(doc.current_effective_version_id) if doc.current_effective_version_id else None,
     }
 
 
 def _version_snapshot(version: DocumentVersion) -> dict:
+    status = version.status.value if hasattr(version.status, "value") else str(version.status)
     return {
         "id": str(version.id),
         "document_id": str(version.document_id),
         "version_no": version.version_no,
-        "status": str(version.status),
+        "status": status,
         "file_hash": version.file_hash,
     }
 
diff --git a/backend/app/services/etmf_service.py b/backend/app/services/etmf_service.py
index 704b9cd1..9cfb4e59 100644
--- a/backend/app/services/etmf_service.py
+++ b/backend/app/services/etmf_service.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import uuid
+import json
 from collections import defaultdict
 from typing import Iterable
 
@@ -18,6 +19,17 @@ from app.schemas.document import DocumentCreate, DocumentSummary
 from app.schemas.etmf import EtmfNodeCreate, EtmfNodeRead, EtmfNodeStatus, EtmfTreeNode, EtmfNodeUpdate
 
 
+def _node_audit_snapshot(node: EtmfNode) -> dict[str, object | None]:
+    return {
+        "code": node.code,
+        "name": node.name,
+        "parent_id": str(node.parent_id) if node.parent_id else None,
+        "scope_type": node.scope_type,
+        "required": node.required,
+        "is_active": node.is_active,
+    }
+
+
 def calculate_node_status(node: EtmfNode, documents: Iterable[Document]) -> EtmfNodeStatus:
     docs = list(documents)
     if not node.is_active:
@@ -102,7 +114,10 @@ async def create_node(db: AsyncSession, payload: EtmfNodeCreate, current_user) -
             entity_type="ETMF_NODE",
             entity_id=node.id,
             action="ETMF_NODE_CREATED",
-            detail=f'{{"code":"{node.code}","name":"{node.name}"}}',
+            detail=json.dumps(
+                {"targetName": node.name, "after": _node_audit_snapshot(node)},
+                ensure_ascii=False,
+            ),
             operator_id=current_user.id,
             operator_role=await get_operator_role_label(db, payload.study_id, current_user),
         )
@@ -124,14 +139,20 @@ async def update_node(db: AsyncSession, node_id: uuid.UUID, payload: EtmfNodeUpd
         parent = await etmf_crud.get_node(db, values["parent_id"])
         if not parent or parent.study_id != node.study_id or parent.id == node.id:
             raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="父级eTMF目录不合法")
+    before = _node_audit_snapshot(node)
     await etmf_crud.update_node(db, node_id, values, commit=False)
+    updated_snapshot = {**before, **{key: value for key, value in values.items() if key in before}}
     db.add(
         AuditLog(
             study_id=node.study_id,
             entity_type="ETMF_NODE",
             entity_id=node.id,
             action="ETMF_NODE_UPDATED",
-            detail="{}",
+            detail=json.dumps(
+                {"targetName": updated_snapshot.get("name") or before.get("name"), "before": before, "after": updated_snapshot},
+                ensure_ascii=False,
+                default=str,
+            ),
             operator_id=current_user.id,
             operator_role=await get_operator_role_label(db, node.study_id, current_user),
         )
diff --git a/backend/tests/test_admin_pm_permissions.py b/backend/tests/test_admin_pm_permissions.py
index 1733fd7e..dc0e444d 100644
--- a/backend/tests/test_admin_pm_permissions.py
+++ b/backend/tests/test_admin_pm_permissions.py
@@ -1,4 +1,5 @@
 import uuid
+import json
 from dataclasses import dataclass
 
 import pytest
@@ -7,11 +8,11 @@ from sqlalchemy import text
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.api.v1.api_permissions import get_my_study_api_permissions, update_study_api_permissions
-from app.api.v1.members import update_member
+from app.api.v1.members import add_member, update_member
 from app.api.v1.permission_monitoring import resolve_monitoring_scope
 from app.api.v1.system_permissions import list_system_permissions
 from app.core.deps import require_admin_or_any_project_pm, require_system_permission
-from app.schemas.member import StudyMemberUpdate
+from app.schemas.member import StudyMemberCreate, StudyMemberUpdate
 
 
 @dataclass
@@ -40,6 +41,26 @@ async def _seed_user(db: AsyncSession, user_id: uuid.UUID, *, is_admin: bool = F
     )
 
 
+async def _seed_named_user(db: AsyncSession, user_id: uuid.UUID, full_name: str, *, is_admin: bool = False) -> None:
+    await db.execute(
+        text(
+            """
+            INSERT INTO users (id, email, password_hash, full_name, clinical_department, is_admin, status)
+            VALUES (:id, :email, :password_hash, :full_name, :clinical_department, :is_admin, :status)
+            """
+        ),
+        {
+            "id": str(user_id),
+            "email": f"{user_id.hex}@example.com",
+            "password_hash": "hash",
+            "full_name": full_name,
+            "clinical_department": "Clinical",
+            "is_admin": is_admin,
+            "status": "ACTIVE",
+        },
+    )
+
+
 async def _seed_study(db: AsyncSession, study_id: uuid.UUID, code: str) -> None:
     await db.execute(
         text(
@@ -289,3 +310,77 @@ async def test_project_pm_cannot_grant_peer_pm_role(db_session: AsyncSession):
         )
 
     assert exc_info.value.status_code == 403
+
+
+@pytest.mark.asyncio
+async def test_project_member_add_audit_uses_member_display_name(db_session: AsyncSession):
+    study_id = uuid.uuid4()
+    admin_id = uuid.uuid4()
+    target_user_id = uuid.uuid4()
+    await _seed_study(db_session, study_id, "MEMBER-AUDIT-NAME")
+    await _seed_user(db_session, admin_id, is_admin=True)
+    await _seed_named_user(db_session, target_user_id, "张三")
+    await db_session.commit()
+
+    await add_member(
+        study_id=study_id,
+        member_in=StudyMemberCreate(user_id=target_user_id, role_in_study="CRA"),
+        current_user=UserStub(id=admin_id, is_admin=True),
+        db=db_session,
+    )
+
+    row = (
+        await db_session.execute(
+            text(
+                """
+                SELECT detail
+                FROM audit_logs
+                WHERE study_id = :study_id AND action = 'PROJECT_MEMBER_ADDED'
+                ORDER BY created_at DESC
+                LIMIT 1
+                """
+            ),
+            {"study_id": str(study_id)},
+        )
+    ).one()
+    detail = json.loads(row.detail)
+    assert detail["targetName"] == "张三"
+    assert str(target_user_id) not in detail["targetName"]
+
+
+@pytest.mark.asyncio
+async def test_project_member_update_audit_uses_member_display_name(db_session: AsyncSession):
+    study_id = uuid.uuid4()
+    admin_id = uuid.uuid4()
+    target_user_id = uuid.uuid4()
+    await _seed_study(db_session, study_id, "MEMBER-UPDATE-AUDIT-NAME")
+    await _seed_user(db_session, admin_id, is_admin=True)
+    await _seed_named_user(db_session, target_user_id, "李四")
+    member_id = await _seed_member_return_id(db_session, study_id, target_user_id, "CRA")
+    await db_session.commit()
+
+    await update_member(
+        study_id=study_id,
+        member_id=member_id,
+        member_in=StudyMemberUpdate(role_in_study="CTA"),
+        current_user=UserStub(id=admin_id, is_admin=True),
+        db=db_session,
+    )
+
+    row = (
+        await db_session.execute(
+            text(
+                """
+                SELECT detail
+                FROM audit_logs
+                WHERE study_id = :study_id AND action = 'PROJECT_MEMBER_UPDATED'
+                ORDER BY created_at DESC
+                LIMIT 1
+                """
+            ),
+            {"study_id": str(study_id)},
+        )
+    ).one()
+    detail = json.loads(row.detail)
+    assert detail["targetName"] == "李四"
+    assert str(target_user_id) not in detail["targetName"]
diff --git a/backend/tests/test_api_permissions.py b/backend/tests/test_api_permissions.py
index e8da4d92..0ded8ed5 100644
--- a/backend/tests/test_api_permissions.py
+++ b/backend/tests/test_api_permissions.py
@@ -588,6 +588,155 @@ def test_audit_export_event_uses_export_permission():
     assert "require_study_member()" not in event_chunk
 
 
+def test_audit_export_event_does_not_trust_client_detail():
+    """导出审计事件的业务描述应由后端生成，不能信任客户端 detail。"""
+    route_path = Path(__file__).resolve().parents[1] / "app" / "api" / "v1" / "audit_logs.py"
+    source = route_path.read_text()
+    event_chunk = source[source.index("async def create_audit_event") :]
+
+    assert "detail=payload.detail" not in event_chunk
+    assert "entity_type=payload.entity_type" not in event_chunk
+    assert "entity_id=payload.entity_id" not in event_chunk
+    assert "_build_export_audit_detail" in event_chunk
+
+
+def test_audit_logs_do_not_expose_delete_endpoint():
+    """审计日志不能提供单条删除接口，避免破坏审计不可篡改性。"""
+    route_path = Path(__file__).resolve().parents[1] / "app" / "api" / "v1" / "audit_logs.py"
+    source = route_path.read_text()
+
+    assert "@router.delete" not in source
+    assert "delete_audit_log" not in source
+
+
+def test_etmf_audit_details_are_structured_json():
+    """eTMF 审计详情不能手拼 JSON 或写空对象。"""
+    service_path = Path(__file__).resolve().parents[1] / "app" / "services" / "etmf_service.py"
+    source = service_path.read_text()
+
+    assert "json.dumps" in source
+    assert "detail=f'{{" not in source
+    assert 'detail="{}"' not in source
+
+
+def test_setup_config_diff_summary_keeps_all_business_changes_and_skips_ids():
+    """立项配置审计明细应完整保留业务字段，跳过行内技术 ID。"""
+    route_path = Path(__file__).resolve().parents[1] / "app" / "api" / "v1" / "studies.py"
+    source = route_path.read_text()
+    summary_chunk = source[source.index("def _setup_collect_diff_lines") : source.index("@router.post")]
+
+    assert '_SETUP_TECHNICAL_FIELDS = {"id"}' in source
+    assert "if key in _SETUP_TECHNICAL_FIELDS:" in summary_chunk
+    assert "已省略" not in summary_chunk
+    assert "max_lines" not in summary_chunk
+
+
+def test_subject_audit_uses_structured_business_snapshot():
+    """参与者审计应把编号放入对象，把业务变化放入详情。"""
+    route_path = Path(__file__).resolve().parents[1] / "app" / "api" / "v1" / "subjects.py"
+    source = route_path.read_text()
+    create_subject_source = source[source.index("async def create_subject") : source.index("@router.get")]
+    update_subject_source = source[source.index("async def update_subject") : source.index("@router.delete")]
+    delete_subject_source = source[source.index("async def delete_subject") :]
+
+    assert "_subject_audit_snapshot" in source
+    assert '"targetName": subject.subject_no' in create_subject_source
+    assert '"description": f"创建参与者 {subject.subject_no}"' in create_subject_source
+    assert '"targetName": updated.subject_no' in update_subject_source
+    assert '"description": description' in update_subject_source
+    assert '"targetName": target_name' in delete_subject_source
+    assert '"description": f"删除参与者 {target_name}"' in delete_subject_source
+    assert '"before": before_snapshot' in delete_subject_source
+    assert 'detail=f"参与者 {subject.subject_no} 已创建"' not in source
+    assert 'f"参与者 {updated.subject_no} 状态' not in source
+    assert 'detail=f"参与者 {subject_id} 已删除"' not in delete_subject_source
+
+
+def test_faq_audit_uses_business_descriptions():
+    """医学咨询审计详情应使用业务描述，避免 FAQ 技术文案。"""
+    api_dir = Path(__file__).resolve().parents[1] / "app" / "api" / "v1"
+    category_source = (api_dir / "faq_categories.py").read_text()
+    item_source = (api_dir / "faqs.py").read_text()
+
+    assert 'description": f"创建“{category.name}”分类"' in category_source
+    assert 'description": f"更新“{updated.name}”分类"' in category_source
+    assert 'description": f"删除“{category_name}”分类"' in category_source
+    assert 'f"创建医学咨询问题“{question_name}”"' in item_source
+    assert 'f"更新医学咨询问题“{question_name}”"' in item_source
+    assert 'f"回复医学咨询问题“{question_name}”"' in item_source
+    assert 'f"删除医学咨询问题“{question_name}”"' in item_source
+    assert 'f"删除医学咨询问题“{question_name}”的回复"' in item_source
+    assert "FAQ 分类 {category.name} 已创建" not in category_source
+    assert 'detail="FAQ 已创建"' not in item_source
+    assert 'detail = "FAQ updated"' not in item_source
+    assert '"description": "创建医学咨询问题"' not in item_source
+
+
+def test_domain_audits_use_business_object_names():
+    """药品、设备、访视、AE、费用、立项等审计应记录具体业务对象。"""
+    api_dir = Path(__file__).resolve().parents[1] / "app" / "api" / "v1"
+    sources = {
+        name: (api_dir / name).read_text()
+        for name in [
+            "drug_shipments.py",
+            "material_equipments.py",
+            "visits.py",
+            "aes.py",
+            "precautions.py",
+            "fees_contracts.py",
+            "startup.py",
+            "subject_histories.py",
+        ]
+    }
+
+    assert "_shipment_audit_description" in sources["drug_shipments.py"]
+    assert "_equipment_audit_detail" in sources["material_equipments.py"]
+    assert "_visit_audit_detail" in sources["visits.py"]
+    assert "_ae_audit_detail" in sources["aes.py"]
+    assert "_precaution_audit_detail" in sources["precautions.py"]
+    assert "_contract_audit_detail" in sources["fees_contracts.py"]
+    assert "_payment_audit_detail" in sources["fees_contracts.py"]
+    assert "_feasibility_audit_detail" in sources["startup.py"]
+    assert "_ethics_audit_detail" in sources["startup.py"]
+    assert "_kickoff_audit_detail" in sources["startup.py"]
+    assert "_training_audit_detail" in sources["startup.py"]
+    assert "_history_audit_detail" in sources["subject_histories.py"]
+
+    forbidden_fragments = [
+        'detail=f"访视 {visit_id} 已删除"',
+        'detail=f"AE {ae.id} 已创建"',
+        'detail=f"AE {ae_id} 已删除"',
+        'detail=f"设备 {item.id} 已创建"',
+        'detail=f"设备 {equipment_id} 已更新"',
+        'detail=f"设备 {equipment_id} 已删除"',
+        'detail=f"注意事项 {precaution_id} 已更新"',
+        'detail=f"注意事项 {precaution_id} 已删除"',
+        'detail="合同费用已创建"',
+        'detail="合同费用已更新"',
+        'detail="合同费用已删除"',
+        'detail="合同费用分期已创建"',
+        'detail="合同费用分期已更新"',
+        'detail="合同费用分期已删除"',
+        'detail="立项记录已创建"',
+        'detail="立项记录已更新"',
+        'detail="立项记录已删除"',
+        'detail="伦理记录已创建"',
+        'detail="伦理记录已更新"',
+        'detail="伦理记录已删除"',
+        'detail="启动会记录已创建"',
+        'detail="启动会记录已更新"',
+        'detail="培训授权人员已创建"',
+        'detail="培训授权人员已更新"',
+        'detail="培训授权人员已删除"',
+        'detail="病史记录已创建"',
+        'detail="病史记录已更新"',
+        'detail="病史记录已删除"',
+    ]
+    combined_source = "\n".join(sources.values())
+    for fragment in forbidden_fragments:
+        assert fragment not in combined_source
+
+
 def test_user_role_contains_current_project_roles():
     assert {"QA", "CTA"} <= set(PROJECT_PERMISSION_ROLES)
 
diff --git a/backend/tests/test_study_delete.py b/backend/tests/test_study_delete.py
index 370de375..118d1712 100644
--- a/backend/tests/test_study_delete.py
+++ b/backend/tests/test_study_delete.py
@@ -8,12 +8,14 @@ from app.crud import study as study_crud
 class _FakeDb:
     def __init__(self):
         self.tables = []
+        self.operations = []
         self.committed = False
 
     async def execute(self, stmt):
         table = getattr(getattr(stmt, "table", None), "name", None)
         if table:
             self.tables.append(table)
+            self.operations.append((getattr(stmt, "__visit_name__", ""), table))
 
     async def commit(self):
         self.committed = True
@@ -29,3 +31,13 @@ async def test_delete_study_removes_contract_fee_payments_before_contract_fees()
     assert "contract_fees" in db.tables
     assert db.tables.index("contract_fee_payments") < db.tables.index("contract_fees")
     assert db.committed is True
+
+
+@pytest.mark.asyncio
+async def test_delete_study_preserves_audit_logs():
+    db = _FakeDb()
+
+    await study_crud.delete(db, uuid.uuid4())
+
+    assert ("delete", "audit_logs") not in db.operations
+    assert ("update", "audit_logs") in db.operations
diff --git a/frontend/src/api/auditLogs.ts b/frontend/src/api/auditLogs.ts
index 7fc8488d..411c04b2 100644
--- a/frontend/src/api/auditLogs.ts
+++ b/frontend/src/api/auditLogs.ts
@@ -1,11 +1,8 @@
-import { apiDelete, apiGet, apiPost } from "./axios";
+import { apiGet, apiPost } from "./axios";
 import type { ApiListResponse } from "../types/api";
 
 export const fetchAuditLogs = (studyId: string, params?: Record<string, any>) =>
   apiGet<ApiListResponse<any>>(`/api/v1/studies/${studyId}/audit-logs/`, { params });
 
-export const deleteAuditLog = (studyId: string, logId: string) =>
-  apiDelete(`/api/v1/studies/${studyId}/audit-logs/${logId}`);
-
 export const createAuditEvent = (studyId: string, payload: Record<string, any>) =>
   apiPost(`/api/v1/studies/${studyId}/audit-logs/events`, payload);
diff --git a/frontend/src/audit/auditNormalize.test.ts b/frontend/src/audit/auditNormalize.test.ts
index 2d46559c..0bf889a0 100644
--- a/frontend/src/audit/auditNormalize.test.ts
+++ b/frontend/src/audit/auditNormalize.test.ts
@@ -16,10 +16,34 @@ describe("normalizeAuditEvent", () => {
       {}
     );
 
-    expect(event.diffText).toEqual(["FAQ 分类已删除"]);
+    expect(event.diffText).toEqual(["删除分类（历史日志未记录分类名称）"]);
     expect(event.targetName).toBe("");
   });
 
+  it("renders legacy FAQ category actions as business descriptions", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "CREATE_FAQ_CATEGORY",
+        detail: JSON.stringify({
+          targetName: "入排标准",
+          description: "FAQ 分类 入排标准 已创建",
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "faq_category",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T11:16:04Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("新增医学咨询分类");
+    expect(event.targetTypeLabel).toBe("医学咨询分类");
+    expect(event.targetName).toBe("入排标准");
+    expect(event.diffText).toEqual(["创建“入排标准”分类"]);
+    expect(event.actionText).toBe("创建“入排标准”分类");
+  });
+
   it("keeps readable shipment identifiers but hides UUID-only shipment identifiers", () => {
     const event = normalizeAuditEvent(
       {
@@ -34,7 +58,436 @@ describe("normalizeAuditEvent", () => {
       {}
     );
 
-    expect(event.diffText).toEqual(["药品运输已创建"]);
+    expect(event.diffText).toEqual(["创建药品流向（历史日志未记录对象信息）"]);
     expect(event.targetName).toBe("");
   });
+
+  it("moves legacy subject numbers into the target column", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "CREATE_SUBJECT",
+        detail: "参与者 S001 已创建",
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "subject",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-08T15:44:48Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("新增参与者");
+    expect(event.targetTypeLabel).toBe("参与者");
+    expect(event.targetName).toBe("S001");
+    expect(event.diffText).toEqual(["创建参与者 S001"]);
+    expect(event.actionText).toBe("创建参与者 S001");
+  });
+
+
+  it("maps legacy project member target UUIDs to user display names", () => {
+    const userId = "169ede81-f2cb-4b44-84c5-c11111111111";
+    const event = normalizeAuditEvent(
+      {
+        action: "PROJECT_MEMBER_UPDATED",
+        detail: JSON.stringify({
+          targetName: userId,
+          before: { role_in_study: "CRA" },
+          after: { role_in_study: "PM" },
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "study_member",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      { [userId]: "张三" }
+    );
+
+    expect(event.targetName).toBe("张三");
+    expect(event.targetName).not.toContain(userId);
+  });
+
+  it("maps user UUIDs inside audit detail lines to display names", () => {
+    const userId = "94dccdc4-5592-4e59-b743-c33333333333";
+    const event = normalizeAuditEvent(
+      {
+        action: "SITE_UPDATED",
+        detail: JSON.stringify({
+          targetName: "重庆市璧山区人民医院",
+          before: { contact: userId },
+          after: { contact: "汤成泳" },
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "site",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      { [userId]: "李四" }
+    );
+
+    expect(event.diffText).toEqual(["负责人：李四 -> 汤成泳"]);
+  });
+
+  it("does not expose unmapped UUID-only target names", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "PROJECT_MEMBER_ADDED",
+        detail: JSON.stringify({
+          targetName: "307e9a37-530c-4894-8d19-f22222222222",
+          after: { role_in_study: "PM" },
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "study_member",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+
+    expect(event.targetName).toBe("");
+  });
+
+  it("translates unknown CRUD action names into readable Chinese labels", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "CREATE_FAQ_ITEM",
+        detail: JSON.stringify({ targetName: "药物保存咨询" }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "faq_item",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("新增医学咨询问题");
+    expect(event.actionText).toBe("新增了医学咨询问题");
+    expect(event.eventLabel).not.toContain("CREATE_FAQ_ITEM");
+    expect(event.actionText).not.toContain("CREATE_FAQ_ITEM");
+  });
+
+  it("uses FAQ question titles in generic structured FAQ descriptions", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "CREATE_FAQ_ITEM",
+        detail: JSON.stringify({
+          targetName: "试验期间是否允许接种疫苗？",
+          description: "创建医学咨询问题",
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "faq_item",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-09T08:55:44Z",
+      },
+      {}
+    );
+
+    expect(event.targetName).toBe("试验期间是否允许接种疫苗？");
+    expect(event.diffText).toEqual(["创建医学咨询问题“试验期间是否允许接种疫苗？”"]);
+    expect(event.actionText).toBe("创建医学咨询问题“试验期间是否允许接种疫苗？”");
+  });
+
+  it("keeps action text focused on the business operation when target names exist", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "CREATE_FAQ_ITEM",
+        detail: JSON.stringify({ targetName: "药物保存咨询" }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "faq_item",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("新增医学咨询问题");
+    expect(event.actionText).toBe("新增了医学咨询问题");
+    expect(event.targetName).toBe("药物保存咨询");
+  });
+
+  it("uses changed fields as action text when the target name duplicates the operation", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "UPDATE_FAQ_CATEGORY",
+        detail: JSON.stringify({
+          targetName: "医学咨询分类",
+          before: { name: "旧分类" },
+          after: { name: "新分类" },
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "faq_category",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("更新医学咨询分类");
+    expect(event.actionText).toBe("名称：旧分类 -> 新分类");
+  });
+
+  it("keeps setup module summary out of change detail lines", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "SAVE_STUDY_SETUP_CONFIG",
+        detail: JSON.stringify({
+          description:
+            "变更模块：项目里程碑; 变更明细：项目里程碑 / 参研中心调研+方案讨论会 / 耗时（天）：30 -> 28；项目里程碑 / 参研中心调研+方案讨论会 / 计划日期：2026-06-01 -> 2026-06-03；项目里程碑 / 参研中心调研+方案讨论会 / 开始日期：2026-06-01 -> 2026-06-03",
+        }),
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "study_setup_config",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-28T09:15:23Z",
+      },
+      {}
+    );
+
+    expect(event.actionText).toBe("变更模块：项目里程碑");
+    expect(event.diffText).toEqual([
+      "项目里程碑 / 参研中心调研+方案讨论会 / 耗时（天）：30 -> 28",
+      "项目里程碑 / 参研中心调研+方案讨论会 / 计划日期：2026-06-01 -> 2026-06-03",
+      "项目里程碑 / 参研中心调研+方案讨论会 / 开始日期：2026-06-01 -> 2026-06-03",
+    ]);
+  });
+
+  it("hides legacy setup technical ID lines and omission placeholders", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "UPDATE_SETUP_CONFIG",
+        detail:
+          "变更模块：项目里程碑; 变更明细：项目里程碑 / 参研中心调研+方案讨论会 / ID：未填写 -> 1778477970865_08roj；项目里程碑 / 参研中心调研+方案讨论会 / 名称：未填写 -> 参研中心调研+方案讨论会；其余 115 项变更已省略",
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "study_setup_config",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-28T09:15:23Z",
+      },
+      {}
+    );
+
+    expect(event.diffText).toEqual([
+      "项目里程碑 / 参研中心调研+方案讨论会 / 名称：未填写 -> 参研中心调研+方案讨论会",
+    ]);
+    expect((event.diffText || []).join(" ")).not.toContain("ID");
+    expect((event.diffText || []).join(" ")).not.toContain("已省略");
+  });
+
+  it("renders document version audit details in business language", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "VERSION_CREATED",
+        detail: JSON.stringify({
+          before: null,
+          after: {
+            id: "307e9a37-530c-4894-8d19-f22222222222",
+            document_id: "169ede81-f2cb-4b44-84c5-c11111111111",
+            version_no: "1.0",
+            status: "EFFECTIVE",
+            file_hash: "95ac0061c81793d533906155921871182076c2dd5bbdd1be0b0e09ebdff17894",
+          },
+        }),
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "DOCUMENT_VERSION",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:42:21Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("新增文档版本");
+    expect(event.targetTypeLabel).toBe("文档版本");
+    expect(event.actionText).toBe("记录标识：未填写 -> 已生成");
+    expect(event.diffText).toEqual([
+      "记录标识：未填写 -> 已生成",
+      "所属文档：未填写 -> 已关联文档",
+      "版本号：未填写 -> V1.0",
+      "版本状态：未填写 -> 已生效",
+      "文件校验值：未填写 -> 已记录校验值",
+    ]);
+    const detailText = (event.diffText || []).join(" ");
+    expect(detailText).not.toContain("字段（id）");
+    expect(detailText).not.toContain("未识别对象");
+    expect(detailText).not.toContain("DocumentVersionStatus");
+    expect(detailText).not.toContain("95ac0061");
+  });
+
+  it("renders enum class-prefixed document version statuses in business language", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "VERSION_CREATED",
+        detail: JSON.stringify({
+          before: null,
+          after: {
+            status: "DocumentVersionStatus.EFFECTIVE",
+          },
+        }),
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "DOCUMENT_VERSION",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:42:21Z",
+      },
+      {}
+    );
+
+    expect(event.diffText).toEqual(["版本状态：未填写 -> 已生效"]);
+    expect((event.diffText || []).join(" ")).not.toContain("DocumentVersionStatus");
+  });
+
+  it("renders structured subject delete audits with subject business context", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "DELETE_SUBJECT",
+        detail: JSON.stringify({
+          targetName: "SUBJ-001",
+          description: "删除参与者 SUBJ-001",
+          before: {
+            subject_no: "SUBJ-001",
+            site_name: "北京协和医院",
+            status: "SCREENING",
+            consent_date: "2026-05-01",
+            baseline_date: null,
+          },
+          after: null,
+        }),
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "subject",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:42:21Z",
+      },
+      {}
+    );
+
+    expect(event.eventLabel).toBe("删除参与者");
+    expect(event.targetName).toBe("SUBJ-001");
+    expect(event.actionText).toBe("删除参与者 SUBJ-001");
+    expect(event.diffText).toContain("参与者编号：SUBJ-001 -> 未填写");
+    expect(event.diffText).toContain("中心名称：北京协和医院 -> 未填写");
+    expect(event.diffText).toContain("知情同意日期：2026-05-01 -> 未填写");
+    expect((event.diffText || []).join(" ")).not.toContain("字段（subject_no）");
+  });
+
+  it("explains legacy subject delete logs that only stored UUIDs", () => {
+    const event = normalizeAuditEvent(
+      {
+        action: "DELETE_SUBJECT",
+        detail: "参与者 307e9a37-530c-4894-8d19-f22222222222 已删除",
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "subject",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:42:21Z",
+      },
+      {}
+    );
+
+    expect(event.diffText).toEqual(["删除参与者（历史日志未记录参与者编号）"]);
+    expect(event.actionText).toBe("删除参与者（历史日志未记录参与者编号）");
+  });
+
+  it("renders legacy drug and equipment audit details with business context", () => {
+    const shipmentEvent = normalizeAuditEvent(
+      {
+        action: "CREATE_DRUG_SHIPMENT",
+        detail: JSON.stringify({
+          targetName: "TRACK-001",
+          description: "药品运输 TRACK-001 已创建",
+        }),
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "drug_shipment",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:37:58Z",
+      },
+      {}
+    );
+    const equipmentEvent = normalizeAuditEvent(
+      {
+        action: "CREATE_MATERIAL_EQUIPMENT",
+        detail: "设备 307e9a37-530c-4894-8d19-f22222222222 已创建",
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "material_equipment",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:36:19Z",
+      },
+      {}
+    );
+
+    expect(shipmentEvent.targetName).toBe("TRACK-001");
+    expect(shipmentEvent.actionText).toBe("创建药品流向“TRACK-001”");
+    expect(equipmentEvent.actionText).toBe("创建设备（历史日志未记录设备名称）");
+    expect(equipmentEvent.targetName).toBe("");
+  });
+
+  it("marks generic legacy fee and startup audit details as missing object context", () => {
+    const feeEvent = normalizeAuditEvent(
+      {
+        action: "CREATE_CONTRACT_FEE",
+        detail: "合同费用已创建",
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "contract_fee",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:36:19Z",
+      },
+      {}
+    );
+    const startupEvent = normalizeAuditEvent(
+      {
+        action: "UPDATE_STARTUP_FEASIBILITY",
+        detail: "立项记录已更新",
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "startup_feasibility",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-05-26T09:33:41Z",
+      },
+      {}
+    );
+
+    expect(feeEvent.actionText).toBe("创建合同费用（历史日志未记录对象信息）");
+    expect(startupEvent.actionText).toBe("更新立项记录（历史日志未记录对象信息）");
+  });
+
+  it("renders high-value non-CRUD setup and lock actions in business language", () => {
+    const lockEvent = normalizeAuditEvent(
+      {
+        action: "LOCK_STUDY",
+        detail: "项目已锁定：真实世界研究 (RWS-001)",
+        operator_id: "operator-1",
+        operator_role: "ADMIN",
+        entity_type: "study",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+    const rollbackEvent = normalizeAuditEvent(
+      {
+        action: "ROLLBACK_SETUP_CONFIG",
+        detail: "立项配置已回滚并替换当前发布为 v3，草稿分支已切换到对应分支基线",
+        operator_id: "operator-1",
+        operator_role: "PM",
+        entity_type: "study_setup_config",
+        entity_id: "307e9a37-530c-4894-8d19-f22222222222",
+        created_at: "2026-06-04T10:27:02Z",
+      },
+      {}
+    );
+
+    expect(lockEvent.eventLabel).toBe("锁定项目");
+    expect(lockEvent.actionText).toBe("锁定了项目");
+    expect(rollbackEvent.eventLabel).toBe("回滚立项配置");
+    expect(rollbackEvent.actionText).toBe("回滚了立项配置");
+  });
 });
diff --git a/frontend/src/audit/export/auditExportFormatter.test.ts b/frontend/src/audit/export/auditExportFormatter.test.ts
new file mode 100644
index 00000000..65848d67
--- /dev/null
+++ b/frontend/src/audit/export/auditExportFormatter.test.ts
@@ -0,0 +1,28 @@
+import { describe, expect, it } from "vitest";
+import { formatAuditRow } from "./auditExportFormatter";
+import type { AuditEvent } from "..";
+
+const baseEvent: AuditEvent = {
+  eventType: "DOCUMENT_UPDATED",
+  eventLabel: "更新文档",
+  actorId: "operator-1",
+  actorName: "张三",
+  actorRole: "PM",
+  actorRoleLabel: "项目经理",
+  targetType: "DOCUMENT",
+  targetTypeLabel: "文档",
+  targetId: "doc-001",
+  actionText: "更新了文档",
+  result: "SUCCESS",
+  resultLabel: "成功",
+  timestamp: "2026-06-04T10:27:02Z",
+};
+
+describe("formatAuditRow", () => {
+  it("keeps target identifiers inside a complete Chinese parenthesis pair", () => {
+    const row = formatAuditRow(baseEvent);
+
+    expect(row.description).toContain("对象：文档（doc-001）");
+    expect(row.description).not.toContain("doc-001)");
+  });
+});
diff --git a/frontend/src/audit/export/auditExportFormatter.ts b/frontend/src/audit/export/auditExportFormatter.ts
index 15d07792..50de3ca9 100644
--- a/frontend/src/audit/export/auditExportFormatter.ts
+++ b/frontend/src/audit/export/auditExportFormatter.ts
@@ -19,9 +19,11 @@ export const formatAuditRow = (event: AuditEvent): AuditExportRow => {
   const descriptionParts: string[] = [];
   descriptionParts.push(`${event.actorName} ${event.actionText}`);
   if (event.targetTypeLabel || event.targetName || event.targetId) {
+    const targetIdentifier = event.targetName || event.targetId;
     descriptionParts.push(
       `${TEXT.audit.objectLabel}${event.targetTypeLabel || ""}${
-        event.targetName ? `（${event.targetName}）` : `（${event.targetId}`})`
+        targetIdentifier ? `（${targetIdentifier}）` : ""
+      }`
     );
   }
   if (event.diffText?.length) {
diff --git a/frontend/src/audit/index.ts b/frontend/src/audit/index.ts
index c71448ea..a7755c8f 100644
--- a/frontend/src/audit/index.ts
+++ b/frontend/src/audit/index.ts
@@ -1,4 +1,4 @@
-import { auditDict } from "./auditDict";
+import { auditDict as localizedAuditDict } from "./auditDict";
 import { roleDict, getDictLabel, statusDict } from "../dictionaries";
 import { TEXT } from "../locales";
 
@@ -45,6 +45,94 @@ const entityTypeLabelMap: Record<string, string> = {
   DOCUMENT_VERSION: "文档版本",
   DISTRIBUTION: "文档分发",
   ACKNOWLEDGEMENT: "文档签收",
+  ETMF_NODE: "eTMF 目录",
+};
+
+const auditActionVerbMap: Record<string, { labelPrefix: string; actionPrefix: string }> = {
+  CREATE: { labelPrefix: "新增", actionPrefix: "新增了" },
+  UPDATE: { labelPrefix: "更新", actionPrefix: "更新了" },
+  DELETE: { labelPrefix: "删除", actionPrefix: "删除了" },
+};
+
+const auditActionTargetMap: Record<string, string> = {
+  FAQ_CATEGORY: "医学咨询分类",
+  FAQ_ITEM: "医学咨询问题",
+  FAQ_REPLY: "医学咨询回复",
+  PRECAUTION: "注意事项",
+  STARTUP_FEASIBILITY: "立项记录",
+  STARTUP_ETHICS: "伦理记录",
+  KICKOFF_MEETING: "启动会",
+  TRAINING_AUTH: "培训授权",
+  SITE: "中心",
+  SUBJECT: "参与者",
+  VISIT: "访视",
+  AE: "不良事件",
+  SUBJECT_PD: "PD 记录",
+  SUBJECT_HISTORY: "病史记录",
+  DRUG_SHIPMENT: "药品流向",
+  MATERIAL_EQUIPMENT: "设备",
+  MONITORING_VISIT_ISSUE: "监查访视问题",
+  CONTRACT_FEE: "合同费用条目",
+  CONTRACT_FEE_PAYMENT: "合同费用回款",
+  ATTACHMENT: "附件",
+  SETUP_CONFIG_VERSION: "立项配置版本",
+  PROJECT_MILESTONE: "项目里程碑",
+  DOCUMENT: "文档",
+  DOCUMENT_VERSION: "文档版本",
+  DISTRIBUTION: "文档分发",
+  ACKNOWLEDGEMENT: "文档签收",
+};
+
+const explicitAuditActionMap: Record<string, { label: string; actionText: string; targetLabel: string }> = {
+  LOCK_STUDY: { label: "锁定项目", actionText: "锁定了项目", targetLabel: "项目" },
+  UNLOCK_STUDY: { label: "解锁项目", actionText: "解锁了项目", targetLabel: "项目" },
+  ROLLBACK_SETUP_CONFIG: { label: "回滚立项配置", actionText: "回滚了立项配置", targetLabel: "立项配置" },
+  CHECKOUT_SETUP_CONFIG_BRANCH_DRAFT: { label: "切换立项配置草稿分支", actionText: "切换了立项配置草稿分支", targetLabel: "立项配置" },
+  CLEAR_SETUP_CONFIG_DRAFT: { label: "清空立项配置草稿", actionText: "清空了立项配置草稿", targetLabel: "立项配置" },
+  REFILL_SETUP_CONFIG_DRAFT: { label: "回填立项配置草稿", actionText: "从当前发布版本回填了立项配置草稿", targetLabel: "立项配置" },
+  MERGE_SETUP_CONFIG_TO_MAIN: { label: "合并立项配置主版本", actionText: "合并了立项配置主版本", targetLabel: "立项配置" },
+  DELETE_SETUP_CONFIG_VERSION: { label: "删除立项配置版本", actionText: "删除了立项配置版本", targetLabel: "立项配置版本" },
+  CREATE_EARLY_TERMINATION: { label: "创建提前终止访视", actionText: "创建了提前终止访视", targetLabel: "访视" },
+  VISIT_STATUS_CHANGE: { label: "访视状态变更", actionText: "变更了访视状态", targetLabel: "访视" },
+  SUBJECT_STATUS_CHANGE: { label: "参与者状态变更", actionText: "变更了参与者状态", targetLabel: "参与者" },
+  AE_STATUS_CHANGE: { label: "AE 状态变更", actionText: "变更了 AE 状态", targetLabel: "不良事件" },
+  SITE_STATUS_CHANGED: { label: "中心状态变更", actionText: "变更了中心状态", targetLabel: "中心" },
+  UPLOAD_FILE: { label: "上传附件", actionText: "上传了附件", targetLabel: "附件" },
+  IMPORT_MONITORING_VISIT_ISSUE: { label: "导入监查访视问题", actionText: "导入了监查访视问题", targetLabel: "监查访视问题" },
+  DOCUMENT_CREATED: { label: "新增文档", actionText: "新增了文档", targetLabel: "文档" },
+  DOCUMENT_UPDATED: { label: "更新文档", actionText: "更新了文档", targetLabel: "文档" },
+  DOCUMENT_ARCHIVED: { label: "归档文档", actionText: "归档了文档", targetLabel: "文档" },
+  VERSION_CREATED: { label: "新增文档版本", actionText: "新增了文档版本", targetLabel: "文档版本" },
+  VERSION_DELETED: { label: "删除文档版本", actionText: "删除了文档版本", targetLabel: "文档版本" },
+  DISTRIBUTION_CREATED: { label: "发起文档分发", actionText: "发起了文档分发", targetLabel: "文档分发" },
+  ACK_CREATED: { label: "提交文档回执", actionText: "提交了文档回执", targetLabel: "文档签收" },
+  ETMF_NODE_CREATED: { label: "新增 eTMF 目录", actionText: "新增了 eTMF 目录", targetLabel: "eTMF 目录" },
+  ETMF_NODE_UPDATED: { label: "更新 eTMF 目录", actionText: "更新了 eTMF 目录", targetLabel: "eTMF 目录" },
+};
+
+export const auditDict: Record<string, { label: string; actionText: string; targetLabel: string }> = {
+  ...localizedAuditDict,
+  ...explicitAuditActionMap,
+};
+
+const buildReadableAuditDict = (action?: string, entityType?: string) => {
+  const actionKey = String(action || "").trim();
+  if (explicitAuditActionMap[actionKey]) return explicitAuditActionMap[actionKey];
+  const match = actionKey.match(/^(CREATE|UPDATE|DELETE)_(.+)$/);
+  if (match) {
+    const verb = auditActionVerbMap[match[1]];
+    const target = auditActionTargetMap[match[2]] || toReadableEntityType(entityType);
+    return {
+      label: `${verb.labelPrefix}${target}`,
+      actionText: `${verb.actionPrefix}${target}`,
+      targetLabel: target,
+    };
+  }
+  return {
+    label: actionKey ? TEXT.audit.eventFallback : TEXT.audit.eventFallback,
+    actionText: TEXT.audit.actionFallback,
+    targetLabel: toReadableEntityType(entityType),
+  };
 };
 
 const setupModuleLabelMap: Record<string, string> = {
@@ -75,6 +163,86 @@ const normalizeSetupModuleText = (raw: string): string => {
 const normalizeLegacyDetailLine = (line: string): string => {
   const text = String(line || "").trim();
   if (!text) return "";
+  if (/^其余\s+\d+\s+项变更已省略$/.test(text)) return "";
+  if (/\/\s*ID[:：]/.test(text) || /^ID[:：]/.test(text)) return "";
+  const legacyFaqCategoryActionMatch = text.match(/^FAQ\s*分类\s+(.+?)\s+已(创建|更新|删除)$/i);
+  if (legacyFaqCategoryActionMatch) {
+    const categoryName = legacyFaqCategoryActionMatch[1].trim();
+    const verb = legacyFaqCategoryActionMatch[2];
+    const actionVerb = verb === "创建" ? "创建" : verb === "更新" ? "更新" : "删除";
+    return isUuidText(categoryName) ? `${actionVerb}分类（历史日志未记录分类名称）` : `${actionVerb}“${categoryName}”分类`;
+  }
+  if (/^FAQ\s*已创建$/i.test(text)) return "创建医学咨询问题";
+  if (/^FAQ\s*updated$/i.test(text) || /^FAQ\s*已更新$/i.test(text)) return "更新医学咨询问题";
+  if (/^FAQ\s*已删除$/i.test(text)) return "删除医学咨询问题";
+  if (/^FAQ\s*已回复$/i.test(text)) return "回复医学咨询问题";
+  if (/^FAQ\s*回复已删除$/i.test(text)) return "删除医学咨询回复";
+  const legacyDrugShipmentMatch = text.match(/^药品运输\s+(.+?)\s+已(创建|更新|删除)$/);
+  if (legacyDrugShipmentMatch) {
+    const name = legacyDrugShipmentMatch[1].trim();
+    const verb = legacyDrugShipmentMatch[2];
+    return isUuidText(name) ? `${verb}药品流向（历史日志未记录对象信息）` : `${verb}药品流向“${name}”`;
+  }
+  const legacyEquipmentMatch = text.match(/^设备\s+(.+?)\s+已(创建|更新|删除)$/);
+  if (legacyEquipmentMatch) {
+    const name = legacyEquipmentMatch[1].trim();
+    const verb = legacyEquipmentMatch[2];
+    return isUuidText(name) ? `${verb}设备（历史日志未记录设备名称）` : `${verb}设备“${name}”`;
+  }
+  const legacyPrecautionMatch = text.match(/^注意事项\s+(.+?)\s+已(创建|更新|删除)$/);
+  if (legacyPrecautionMatch) {
+    const name = legacyPrecautionMatch[1].trim();
+    const verb = legacyPrecautionMatch[2];
+    return isUuidText(name) ? `${verb}注意事项（历史日志未记录标题）` : `${verb}注意事项“${name}”`;
+  }
+  const legacyVisitMatch = text.match(/^访视\s+(.+?)\s+已(创建|更新|删除)$/);
+  if (legacyVisitMatch) {
+    const name = legacyVisitMatch[1].trim();
+    const verb = legacyVisitMatch[2];
+    return isUuidText(name) ? `${verb}访视（历史日志未记录访视号）` : `${verb}访视“${name}”`;
+  }
+  const legacyAeMatch = text.match(/^AE\s+(.+?)\s+已(创建|删除)$/i);
+  if (legacyAeMatch) {
+    const name = legacyAeMatch[1].trim();
+    const verb = legacyAeMatch[2];
+    return isUuidText(name) ? `${verb}AE（历史日志未记录 AE 术语）` : `${verb}AE“${name}”`;
+  }
+  const genericLegacyActionMap: Record<string, string> = {
+    药品运输已创建: "创建药品流向（历史日志未记录对象信息）",
+    药品运输已更新: "更新药品流向（历史日志未记录对象信息）",
+    药品运输已删除: "删除药品流向（历史日志未记录对象信息）",
+    设备已创建: "创建设备（历史日志未记录设备名称）",
+    设备已更新: "更新设备（历史日志未记录设备名称）",
+    设备已删除: "删除设备（历史日志未记录设备名称）",
+    合同费用已创建: "创建合同费用（历史日志未记录对象信息）",
+    合同费用已更新: "更新合同费用（历史日志未记录对象信息）",
+    合同费用已删除: "删除合同费用（历史日志未记录对象信息）",
+    合同费用分期已创建: "创建合同费用分期（历史日志未记录对象信息）",
+    合同费用分期已更新: "更新合同费用分期（历史日志未记录对象信息）",
+    合同费用分期已删除: "删除合同费用分期（历史日志未记录对象信息）",
+    立项记录已创建: "创建立项记录（历史日志未记录对象信息）",
+    立项记录已更新: "更新立项记录（历史日志未记录对象信息）",
+    立项记录已删除: "删除立项记录（历史日志未记录对象信息）",
+    伦理记录已创建: "创建伦理记录（历史日志未记录对象信息）",
+    伦理记录已更新: "更新伦理记录（历史日志未记录对象信息）",
+    伦理记录已删除: "删除伦理记录（历史日志未记录对象信息）",
+    启动会记录已创建: "创建启动会记录（历史日志未记录对象信息）",
+    启动会记录已更新: "更新启动会记录（历史日志未记录对象信息）",
+    培训授权人员已创建: "创建培训授权人员（历史日志未记录人员姓名）",
+    培训授权人员已更新: "更新培训授权人员（历史日志未记录人员姓名）",
+    培训授权人员已删除: "删除培训授权人员（历史日志未记录人员姓名）",
+    病史记录已创建: "创建病史记录（历史日志未记录参与者）",
+    病史记录已更新: "更新病史记录（历史日志未记录参与者）",
+    病史记录已删除: "删除病史记录（历史日志未记录参与者）",
+    访视已更新: "更新访视（历史日志未记录访视号）",
+  };
+  if (genericLegacyActionMap[text]) return genericLegacyActionMap[text];
+  const legacySubjectActionMatch = text.match(/^参与者\s+(.+?)\s+已(创建|更新|删除)$/);
+  if (legacySubjectActionMatch) {
+    const subjectNo = legacySubjectActionMatch[1].trim();
+    const verb = legacySubjectActionMatch[2];
+    return isUuidText(subjectNo) ? `${verb}参与者（历史日志未记录参与者编号）` : `${verb}参与者 ${subjectNo}`;
+  }
   const projectionStatusMatch = text.match(/^projection_status=(.+)$/i);
   if (projectionStatusMatch) {
     const status = projectionStatusMatch[1].trim().toLowerCase();
@@ -107,7 +275,7 @@ const normalizeLegacyDetailLine = (line: string): string => {
   const detailMatch = text.match(/^变更明细[:：]\s*(.*)$/);
   if (detailMatch) {
     const detailText = detailMatch[1].trim();
-    return `变更明细：${detailText || "无"}`;
+    return detailText;
   }
   if (text === "立项配置已发布") return "立项配置已发布";
   if (text.includes("siteEnrollmentPlans")) return text.replaceAll("siteEnrollmentPlans", "中心入组计划");
@@ -124,6 +292,89 @@ const isUuidText = (value: unknown): boolean => {
   return new RegExp(`^${uuidTextPattern}$`).test(String(value || "").trim());
 };
 
+const replaceUuidReferences = (text: string, userMap: Record<string, string>): string => {
+  return String(text || "").replace(new RegExp(uuidTextPattern, "g"), (uuid) => userMap[uuid] || "未识别对象");
+};
+
+const extractLegacySubjectTargetName = (description: string): string => {
+  const match = String(description || "").trim().match(/^参与者\s+(.+?)\s+已(?:创建|更新|删除)$/);
+  if (!match) return "";
+  const subjectNo = match[1].trim();
+  return isUuidText(subjectNo) ? "" : subjectNo;
+};
+
+const extractLegacyFaqCategoryTargetName = (description: string): string => {
+  const match = String(description || "").trim().match(/^FAQ\s*分类\s+(.+?)\s+已(?:创建|更新|删除)$/i);
+  if (!match) return "";
+  const categoryName = match[1].trim();
+  return isUuidText(categoryName) ? "" : categoryName;
+};
+
+const enrichStructuredDescription = (action: string, description: string, targetName: string): string => {
+  const desc = String(description || "").trim();
+  const target = String(targetName || "").trim();
+  if (!desc || !target || desc.includes("“")) return desc;
+  if (action === "CREATE_FAQ_ITEM" && desc === "创建医学咨询问题") return `创建医学咨询问题“${target}”`;
+  if (action === "UPDATE_FAQ_ITEM" && desc === "更新医学咨询问题") return `更新医学咨询问题“${target}”`;
+  if (action === "DELETE_FAQ_ITEM" && desc === "删除医学咨询问题") return `删除医学咨询问题“${target}”`;
+  if (action === "CREATE_FAQ_REPLY" && desc === "回复医学咨询问题") return `回复医学咨询问题“${target}”`;
+  if (action === "DELETE_FAQ_REPLY" && desc === "删除医学咨询回复") return `删除医学咨询问题“${target}”的回复`;
+  const genericStructuredActionMap: Record<string, string> = {
+    CREATE_DRUG_SHIPMENT: "创建药品流向",
+    UPDATE_DRUG_SHIPMENT: "更新药品流向",
+    DELETE_DRUG_SHIPMENT: "删除药品流向",
+    CREATE_MATERIAL_EQUIPMENT: "创建设备",
+    UPDATE_MATERIAL_EQUIPMENT: "更新设备",
+    DELETE_MATERIAL_EQUIPMENT: "删除设备",
+    CREATE_PRECAUTION: "创建注意事项",
+    UPDATE_PRECAUTION: "更新注意事项",
+    DELETE_PRECAUTION: "删除注意事项",
+    CREATE_VISIT: "创建访视",
+    UPDATE_VISIT: "更新访视",
+    DELETE_VISIT: "删除访视",
+    CREATE_AE: "创建AE",
+    UPDATE_AE: "更新AE",
+    DELETE_AE: "删除AE",
+    CREATE_CONTRACT_FEE: "创建合同费用",
+    UPDATE_CONTRACT_FEE: "更新合同费用",
+    DELETE_CONTRACT_FEE: "删除合同费用",
+    CREATE_CONTRACT_FEE_PAYMENT: "创建合同费用分期",
+    UPDATE_CONTRACT_FEE_PAYMENT: "更新合同费用分期",
+    DELETE_CONTRACT_FEE_PAYMENT: "删除合同费用分期",
+    CREATE_STARTUP_FEASIBILITY: "创建立项记录",
+    UPDATE_STARTUP_FEASIBILITY: "更新立项记录",
+    DELETE_STARTUP_FEASIBILITY: "删除立项记录",
+    CREATE_STARTUP_ETHICS: "创建伦理记录",
+    UPDATE_STARTUP_ETHICS: "更新伦理记录",
+    DELETE_STARTUP_ETHICS: "删除伦理记录",
+    CREATE_KICKOFF_MEETING: "创建启动会记录",
+    UPDATE_KICKOFF_MEETING: "更新启动会记录",
+    CREATE_TRAINING_AUTH: "创建培训授权人员",
+    UPDATE_TRAINING_AUTH: "更新培训授权人员",
+    DELETE_TRAINING_AUTH: "删除培训授权人员",
+    CREATE_SUBJECT_HISTORY: "创建病史记录",
+    UPDATE_SUBJECT_HISTORY: "更新病史记录",
+    DELETE_SUBJECT_HISTORY: "删除病史记录",
+  };
+  const structuredPrefix = genericStructuredActionMap[action];
+  if (structuredPrefix && desc === structuredPrefix) return `${structuredPrefix}“${target}”`;
+  return desc;
+};
+
+const isSetupModuleSummaryLine = (line: string): boolean => /^变更模块[:：]/.test(String(line || "").trim());
+
+const buildActionText = (
+  dictActionText: string,
+  diffLines: string[],
+  summaryText = "",
+  preferDictAction = false
+): string => {
+  if (summaryText) return summaryText;
+  if (preferDictAction) return dictActionText;
+  if (diffLines.length > 0) return diffLines[0];
+  return dictActionText;
+};
+
 const splitAuditDetailSegments = (line: string): string[] => {
   const text = String(line || "").trim();
   if (!text) return [];
@@ -134,6 +385,19 @@ const splitAuditDetailSegments = (line: string): string[] => {
 };
 
 const auditFieldLabelMap: Record<string, string> = {
+  id: "记录标识",
+  trial_id: "所属项目",
+  study_id: "所属项目",
+  document_id: "所属文档",
+  version_id: "文档版本",
+  distribution_id: "分发记录",
+  target_id: "分发对象",
+  site_id: "中心",
+  etmf_node_id: "eTMF 目录",
+  current_effective_version_id: "当前生效版本",
+  parent_version_id: "上一版本",
+  derived_from_version_id: "来源版本",
+  owner_id: "负责人",
   issue_no: "问题编号",
   source: "问题来源",
   monitor_type: "监查类型",
@@ -142,6 +406,7 @@ const auditFieldLabelMap: Record<string, string> = {
   recommendation: "建议措施",
   subject_name: "受试者",
   subject_code: "受试者缩写号",
+  subject_no: "参与者编号",
   description: "问题描述",
   action_taken: "采取措施",
   follow_up_progress: "跟进计划及进展",
@@ -166,8 +431,75 @@ const auditFieldLabelMap: Record<string, string> = {
   city: "城市",
   contact: "负责人",
   phone: "电话",
+  doc_no: "文档编号",
+  doc_type: "文档类型",
+  title: "文档标题",
+  scope_type: "文档范围",
+  version_no: "版本号",
+  file_hash: "文件校验值",
+  file_uri: "文件位置",
+  file_size: "文件大小",
+  mime_type: "文件类型",
+  change_summary: "变更说明",
+  effective_at: "生效时间",
+  superseded_at: "替代时间",
+  submitted_at: "提交时间",
+  approved_at: "批准时间",
+  withdrawn_at: "撤回时间",
+  created_at: "创建时间",
+  created_by: "创建人",
+  target_type: "分发范围",
+  ack_type: "回执类型",
+  acked_at: "回执时间",
+  note: "备注",
   plan_start_date: "计划开始日期",
   plan_end_date: "计划结束日期",
+  screening_date: "筛选日期",
+  consent_date: "知情同意日期",
+  enrollment_date: "入组日期",
+  baseline_date: "基线日期",
+  completion_date: "完成日期",
+  actual_medication_count: "实际给药次数",
+  drop_reason: "脱落原因",
+};
+
+const documentVersionStatusLabelMap: Record<string, string> = {
+  DRAFT: "草稿",
+  SUBMITTED: "已提交",
+  APPROVED: "已批准",
+  EFFECTIVE: "已生效",
+  SUPERSEDED: "已被替代",
+  ARCHIVED: "已归档",
+  WITHDRAWN: "已撤回",
+};
+
+const documentStatusLabelMap: Record<string, string> = {
+  ACTIVE: "使用中",
+  ARCHIVED: "已归档",
+};
+
+const documentScopeTypeLabelMap: Record<string, string> = {
+  GLOBAL: "项目级文档",
+  SITE: "中心级文档",
+  DERIVED: "派生文档",
+};
+
+const distributionTargetTypeLabelMap: Record<string, string> = {
+  SITE: "中心",
+  ROLE: "角色",
+  USER: "指定人员",
+};
+
+const acknowledgementTypeLabelMap: Record<string, string> = {
+  RECEIVED: "已接收",
+  READ: "已阅读",
+  TRAINED: "已培训",
+};
+
+const normalizeEnumToken = (text: string): string => {
+  const trimmed = String(text || "").trim();
+  const parts = trimmed.split(".");
+  return parts[parts.length - 1] || trimmed;
 };
 
 const stableSerialize = (value: any): string => {
@@ -202,14 +534,44 @@ const compactObjectValue = (value: Record<string, any>): string => {
   return entries.length > 3 ? `${rendered} 等${entries.length}项` : rendered;
 };
 
-const toReadableFieldLabel = (key: string): string => {
+const toReadableFieldLabel = (key: string, entityType = ""): string => {
   const normalized = String(key || "").trim();
   if (!normalized) return "字段";
+  if (normalized === "status" && entityType === "DOCUMENT_VERSION") return "版本状态";
+  if (normalized === "status" && entityType === "DOCUMENT") return "文档状态";
+  if (normalized === "due_at" && (entityType === "DISTRIBUTION" || entityType === "ACKNOWLEDGEMENT")) return "截止日期";
   if (auditFieldLabelMap[normalized]) return auditFieldLabelMap[normalized];
   return `字段（${normalized}）`;
 };
 
-const toReadableValue = (key: string, value: any): string => {
+const readableUuidPlaceholder = (key: string): string => {
+  const normalized = String(key || "").trim();
+  if (normalized === "id") return "已生成";
+  if (normalized === "trial_id" || normalized === "study_id") return "已关联项目";
+  if (normalized === "document_id") return "已关联文档";
+  if (normalized === "version_id" || normalized.endsWith("_version_id")) return "已关联版本";
+  if (normalized === "distribution_id") return "已关联分发记录";
+  if (normalized === "site_id") return "已关联中心";
+  if (normalized === "owner_id" || normalized === "created_by" || normalized.endsWith("_user_id")) return "已关联人员";
+  if (normalized.endsWith("_id")) return "已关联对象";
+  return "系统记录";
+};
+
+const toReadableEnumValue = (key: string, text: string): string => {
+  const normalizedText = normalizeEnumToken(text);
+  if (key === "status") {
+    return documentVersionStatusLabelMap[normalizedText] || documentStatusLabelMap[normalizedText] || getDictLabel(statusDict, normalizedText) || text;
+  }
+  if (key === "scope_type") return documentScopeTypeLabelMap[normalizedText] || text;
+  if (key === "target_type") return distributionTargetTypeLabelMap[normalizedText] || text;
+  if (key === "ack_type") return acknowledgementTypeLabelMap[normalizedText] || text;
+  if (key.toLowerCase().includes("status")) {
+    return documentVersionStatusLabelMap[normalizedText] || documentStatusLabelMap[normalizedText] || getDictLabel(statusDict, normalizedText) || text;
+  }
+  return text;
+};
+
+const toReadableValue = (key: string, value: any, userMap: Record<string, string>): string => {
   if (value === null || value === undefined || value === "") return "未填写";
   if (typeof value === "boolean") {
     if (key === "is_active") return value ? "启用" : "停用";
@@ -219,14 +581,14 @@ const toReadableValue = (key: string, value: any): string => {
   if (typeof value === "string") {
     const text = value.trim();
     if (!text) return "未填写";
-    if (key.toLowerCase().includes("status")) {
-      return getDictLabel(statusDict, text) || text;
-    }
-    return text;
+    if (key === "file_hash") return "已记录校验值";
+    if (isUuidText(text)) return userMap[text] || readableUuidPlaceholder(key);
+    if (key === "version_no") return text.startsWith("V") ? text : `V${text}`;
+    return toReadableEnumValue(key, text);
   }
   if (Array.isArray(value)) {
     if (value.length === 0) return "未填写";
-    const rendered = value.slice(0, 3).map((item) => toReadableValue(key, item)).join("、");
+    const rendered = value.slice(0, 3).map((item) => toReadableValue(key, item, userMap)).join("、");
     return value.length > 3 ? `${rendered} 等${value.length}项` : rendered;
   }
   if (typeof value === "object") {
@@ -235,7 +597,12 @@ const toReadableValue = (key: string, value: any): string => {
   return String(value);
 };
 
-const buildDiffText = (before?: Record<string, any>, after?: Record<string, any>) => {
+const buildDiffText = (
+  before: Record<string, any> | undefined,
+  after: Record<string, any> | undefined,
+  userMap: Record<string, string>,
+  entityType = ""
+) => {
   if (!before && !after) return [];
   const lines: string[] = [];
   const prevObj = before || {};
@@ -244,20 +611,16 @@ const buildDiffText = (before?: Record<string, any>, after?: Record<string, any>
     const prev = prevObj[key];
     const next = nextObj[key];
     if (isSameValue(prev, next)) return;
-    const label = toReadableFieldLabel(key);
-    const prevText = toReadableValue(key, prev);
-    const nextText = toReadableValue(key, next);
+    const label = toReadableFieldLabel(key, entityType);
+    const prevText = toReadableValue(key, prev, userMap);
+    const nextText = toReadableValue(key, next, userMap);
     lines.push(`${label}：${prevText} -> ${nextText}`);
   });
   return lines;
 };
 
 export const normalizeAuditEvent = (raw: any, userMap: Record<string, string>): AuditEvent => {
-  const dict = auditDict[raw.action] || {
-    label: raw.action ? `${TEXT.audit.eventFallback}（${raw.action}）` : TEXT.audit.eventFallback,
-    actionText: raw.action ? `执行了${raw.action}` : TEXT.audit.actionFallback,
-    targetLabel: toReadableEntityType(raw.entity_type),
-  };
+  const dict = auditDict[raw.action] || buildReadableAuditDict(raw.action, raw.entity_type);
   let detailObj: any = {};
   if (raw.detail) {
     try {
@@ -268,18 +631,39 @@ export const normalizeAuditEvent = (raw: any, userMap: Record<string, string>):
   }
   const before = detailObj.before;
   const after = detailObj.after;
-  const fallbackDescription = typeof detailObj.description === "string" ? detailObj.description.trim() : "";
-  let diffText = detailObj.diffText || buildDiffText(before, after);
+  const detailTargetName = String(detailObj.targetName || "").trim();
+  const rawFallbackDescription = typeof detailObj.description === "string" ? detailObj.description.trim() : "";
+  const fallbackDescription = enrichStructuredDescription(raw.action, rawFallbackDescription, isUuidText(detailTargetName) ? "" : detailTargetName);
+  let diffText = detailObj.diffText || buildDiffText(before, after, userMap, raw.entity_type || "");
   if ((!Array.isArray(diffText) || diffText.length === 0) && fallbackDescription) {
     diffText = fallbackDescription
       .split(/[；;\n]/)
       .map((item: string) => item.trim())
       .filter(Boolean);
   }
-  const readableDiffText = (Array.isArray(diffText) ? diffText : diffText ? [String(diffText)] : [])
+  const normalizedDiffText = (Array.isArray(diffText) ? diffText : diffText ? [String(diffText)] : [])
     .flatMap((line) => splitAuditDetailSegments(String(line)))
     .map((line) => normalizeLegacyDetailLine(line))
+    .map((line) => replaceUuidReferences(line, userMap))
     .filter(Boolean);
+  const setupModuleSummary = normalizedDiffText.find((line) => isSetupModuleSummaryLine(line)) || "";
+  const readableDiffText = normalizedDiffText.filter((line) => !isSetupModuleSummaryLine(line));
+  const legacySubjectTargetName = extractLegacySubjectTargetName(fallbackDescription);
+  const legacyFaqCategoryTargetName = extractLegacyFaqCategoryTargetName(fallbackDescription);
+  const targetName = isUuidText(detailTargetName)
+    ? userMap[detailTargetName] || ""
+    : detailObj.targetName || legacySubjectTargetName || legacyFaqCategoryTargetName || (isUuidText(raw.entity_id) ? "" : raw.entity_id || "");
+  const preferDictAction = Boolean(explicitAuditActionMap[raw.action] && fallbackDescription);
+  const hasStructuredDetail = typeof raw.detail === "string" && raw.detail.trim().startsWith("{");
+  const actionText =
+    raw.action === "DELETE_SUBJECT" && hasStructuredDetail && fallbackDescription
+      ? fallbackDescription
+      : buildActionText(
+          dict.actionText,
+          readableDiffText,
+          setupModuleSummary,
+          preferDictAction
+        );
   return {
     eventType: raw.action,
     eventLabel: dict.label,
@@ -290,8 +674,8 @@ export const normalizeAuditEvent = (raw: any, userMap: Record<string, string>):
     targetType: raw.entity_type || "",
     targetTypeLabel: dict.targetLabel,
     targetId: raw.entity_id || "",
-    targetName: detailObj.targetName || (isUuidText(raw.entity_id) ? "" : raw.entity_id || ""),
-    actionText: dict.actionText,
+    targetName,
+    actionText,
     before,
     after,
     diffText: readableDiffText,
@@ -302,8 +686,6 @@ export const normalizeAuditEvent = (raw: any, userMap: Record<string, string>):
   };
 };
 
-export { auditDict };
-
 // Deprecated: keep API-compatible no-op to avoid accidental reliance on browser local storage.
 export const logAudit = async (eventType: string, payload: Record<string, any>) => {
   void eventType;
diff --git a/frontend/src/locales/zh-CN.ts b/frontend/src/locales/zh-CN.ts
index 099345ca..14aa07c4 100644
--- a/frontend/src/locales/zh-CN.ts
+++ b/frontend/src/locales/zh-CN.ts
@@ -238,8 +238,12 @@ export const TEXT = {
       ISSUE_STATUS_CHANGED: { label: "风险/问题状态变更", actionText: "更新了风险/问题状态", targetLabel: "风险/问题" },
       UNAUTHORIZED_ACTION_ATTEMPT: { label: "越权操作尝试", actionText: "尝试执行无权限操作", targetLabel: "系统资源" },
       INVALID_STATE_TRANSITION_ATTEMPT: { label: "非法状态流转尝试", actionText: "尝试执行非法状态流转", targetLabel: "业务对象" },
+      PROJECT_MEMBER_ADDED: { label: "项目成员新增", actionText: "添加了项目成员", targetLabel: "项目成员" },
       PROJECT_MEMBER_UPDATED: { label: "项目成员变更", actionText: "调整了项目成员", targetLabel: "项目成员" },
+      PROJECT_MEMBER_REMOVED: { label: "项目成员移除", actionText: "移除了项目成员", targetLabel: "项目成员" },
       SITE_CRA_BOUND: { label: "中心 CRA 绑定", actionText: "调整了中心与 CRA 的绑定", targetLabel: "中心" },
+      SITE_CREATED: { label: "新增中心", actionText: "新增了中心", targetLabel: "中心" },
+      SITE_UPDATED: { label: "更新中心", actionText: "更新了中心", targetLabel: "中心" },
       SITE_STATUS_CHANGED: { label: "中心状态变更", actionText: "更新了中心信息", targetLabel: "中心" },
       AUDIT_EXPORT_SYSTEM: { label: "导出系统审计", actionText: "导出了系统审计日志", targetLabel: "审计日志" },
       AUDIT_EXPORT_PROJECT: { label: "导出项目审计", actionText: "导出了项目审计日志", targetLabel: "审计日志" },
diff --git a/frontend/src/router.test.ts b/frontend/src/router.test.ts
index 48a19db2..7ffd2158 100644
--- a/frontend/src/router.test.ts
+++ b/frontend/src/router.test.ts
@@ -29,6 +29,19 @@ describe("admin project route permissions", () => {
     expect(source).toContain("studyStore.currentPermissions?.[role]?.[operationKey]");
   });
 
+  it("checks admin project permissions against query project id when present", () => {
+    const source = readRouter();
+    const accessStart = source.indexOf("const ensureAdminProjectAccess");
+    const accessEnd = source.indexOf("const ensureRouteProjectMember", accessStart);
+    const accessBlock = source.slice(accessStart, accessEnd);
+
+    expect(accessBlock).toContain("const targetProjectId = getTargetProjectId(to);");
+    expect(accessBlock).toContain("studyStore.currentStudy?.id !== targetProjectId");
+    expect(accessBlock).toContain("fetchStudyDetail(targetProjectId)");
+    expect(accessBlock).toContain("fetchApiEndpointPermissions(targetProjectId)");
+    expect(accessBlock).not.toContain("typeof to.params.projectId");
+  });
+
   it("guards project permission configuration with the system-level project config permission", () => {
     const source = readRouter();
     const projectPermissionRouteStart = source.indexOf('name: "AdminPermissionsProject"');
diff --git a/frontend/src/router/index.ts b/frontend/src/router/index.ts
index 0214ea89..e955917c 100644
--- a/frontend/src/router/index.ts
+++ b/frontend/src/router/index.ts
@@ -454,11 +454,11 @@ const ensureAdminProjectAccess = async (to: any, isAdmin: boolean) => {
   const permission = to.meta.adminProjectPermission as { module: string; action: "read" | "write" } | undefined;
   if (!permission) return true;
 
-  const routeProjectId = typeof to.params.projectId === "string" ? to.params.projectId : "";
-  if (routeProjectId && studyStore.currentStudy?.id !== routeProjectId) {
+  const targetProjectId = getTargetProjectId(to);
+  if (targetProjectId && studyStore.currentStudy?.id !== targetProjectId) {
     const [{ data: project }, { data: permissions }] = await Promise.all([
-      fetchStudyDetail(routeProjectId),
-      fetchApiEndpointPermissions(routeProjectId),
+      fetchStudyDetail(targetProjectId),
+      fetchApiEndpointPermissions(targetProjectId),
     ]);
     studyStore.setCurrentStudy(project);
     studyStore.currentPermissions = permissions;
diff --git a/frontend/src/views/admin/AuditLogs.test.ts b/frontend/src/views/admin/AuditLogs.test.ts
index aaac54be..d4661ff9 100644
--- a/frontend/src/views/admin/AuditLogs.test.ts
+++ b/frontend/src/views/admin/AuditLogs.test.ts
@@ -5,6 +5,29 @@ import { resolve } from "node:path";
 const readAuditLogsView = () => readFileSync(resolve(__dirname, "./AuditLogs.vue"), "utf8");
 
 describe("audit logs access", () => {
+  it("loads audit logs from the selected project context", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain("const selectedStudy = ref<Study | null>(null)");
+    expect(source).toContain("const selectedStudyId = computed({");
+    expect(source).toContain("get: () => selectedStudy.value?.id || \"\"");
+    expect(source).toContain("set: (studyId: string) => {");
+    expect(source).toContain("await fetchAuditLogs(selectedStudyId.value, params)");
+    expect(source).toContain("await fetchApiEndpointPermissions(selectedStudyId.value)");
+    expect(source).toContain("await createAuditEvent(selectedStudyId.value,");
+    expect(source).not.toContain("await fetchAuditLogs(study.currentStudy.id, params)");
+  });
+
+  it("limits non-admin project choices to PM-owned projects", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain('const availableItems = isAdmin.value ? items : items.filter((item) => item.role_in_study === "PM");');
+    expect(source).toContain("studies.value = availableItems;");
+    expect(source).toContain("availableItems.find((item) => item.id === queryProjectId)");
+    expect(source).toContain("availableItems.find((item) => item.id === study.currentStudy?.id)");
+    expect(source).toContain("availableItems[0]");
+  });
+
   it("allows only admins or authorized PMs to use audit export", () => {
     const source = readAuditLogsView();
 
@@ -16,11 +39,75 @@ describe("audit logs access", () => {
     expect(source).toContain("isApiPermissionAllowed");
     expect(source).toContain('permissionMatrix.value?.[projectRole.value]?.["audit_logs:read"]');
     expect(source).toContain('permissionMatrix.value?.[projectRole.value]?.["audit_logs:export"]');
-    expect(source).toContain('if (scope === "project" && !canProjectExport.value) return;');
+    expect(source).toContain("if (!canProjectExport.value) return;");
+    expect(source).toContain('action: "AUDIT_EXPORT_PROJECT"');
+    expect(source).not.toContain('command="system"');
     expect(source).not.toMatch(/auth\.user\?\.role/);
     expect(source).not.toContain('!== "ADMIN"');
   });
 
+  it("exports all matching audit log pages instead of a fixed first page", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain("const fetchAuditLogPages = async");
+    expect(source).toContain("while (true)");
+    expect(source).toContain("if (items.length < batchLimit) break;");
+    expect(source).not.toContain("limit: 2000");
+  });
+
+  it("keeps the audit table compact by removing the duplicate content column", () => {
+    const source = readAuditLogsView();
+
+    expect(source).not.toContain('prop="actionText"');
+    expect(source).not.toContain("TEXT.modules.adminAuditLogs.columns.action");
+    expect(source).toContain("TEXT.modules.adminAuditLogs.columns.target");
+    expect(source).toContain("TEXT.modules.adminAuditLogs.columns.diff");
+  });
+
+  it("shows actor names without avatar icons in the audit table", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain('<span class="actor-name">{{ scope.row.actorName }}</span>');
+    expect(source).not.toContain("actor-avatar");
+    expect(source).not.toContain("getInitials(scope.row.actorName)");
+  });
+
+  it("lets target and detail columns absorb remaining table width", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain('<el-table-column :label="TEXT.modules.adminAuditLogs.columns.target" min-width="240">');
+    expect(source).toContain('<el-table-column :label="TEXT.modules.adminAuditLogs.columns.diff" min-width="360">');
+    expect(source).not.toContain(':label="TEXT.modules.adminAuditLogs.columns.target" width="240"');
+    expect(source).not.toContain(':label="TEXT.modules.adminAuditLogs.columns.diff" width="360"');
+  });
+
+  it("parses diff lines by the last field separator before the arrow", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toMatch(/line\.match\(\/\^\(\.\+\)\[:：\]\\s\*\(\.\*\?\)\\s\*->\\s\*\(\.\+\)\$\/\)/);
+    expect(source).not.toMatch(/line\.match\(\/\^\(\.\+\?\)：\(\.\+\?\)\\s\*->\\s\*\(\.\+\)\$\/\)/);
+  });
+
+  it("renders detail object and action as two cards in one row", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain('<span class="meta-label">对象</span>');
+    expect(source).toContain('<span class="meta-label">动作</span>');
+    expect(source).not.toContain("detail-meta-full");
+    expect(source).not.toContain("meta-card-full");
+  });
+
+  it("groups setup diff detail rows by business item path", () => {
+    const source = readAuditLogsView();
+
+    expect(source).toContain("const buildDetailDiffGroups = (lines: any[]): DetailDiffGroup[] => {");
+    expect(source).toContain('const groupedIndex = new Map<string, DetailDiffGroup>();');
+    expect(source).toContain('title: parts.slice(0, -1).join(" / "),');
+    expect(source).toContain("field: parts[parts.length - 1],");
+    expect(source).toContain('class="diff-group-title"');
+    expect(source).toContain("{{ selectedDiffGroups.length }} 项");
+  });
+
   it("does not expose legacy startup ethics business labels", () => {
     const auditSource = readFileSync(resolve(__dirname, "../../audit/index.ts"), "utf8");
     const overviewSource = readFileSync(resolve(__dirname, "../ia/project-overview/overview.adapter.ts"), "utf8");
diff --git a/frontend/src/views/admin/AuditLogs.vue b/frontend/src/views/admin/AuditLogs.vue
index 4c07179b..706f525e 100644
--- a/frontend/src/views/admin/AuditLogs.vue
+++ b/frontend/src/views/admin/AuditLogs.vue
@@ -44,6 +44,11 @@
       <!-- 筛选栏 -->
       <div class="audit-toolbar unified-action-bar">
         <el-form :inline="true" :model="filters" class="filter-form">
+          <div class="filter-item-form">
+            <el-select v-model="selectedStudyId" filterable :placeholder="TEXT.common.fields.projectName" @change="onProjectChange" class="filter-select-project">
+              <el-option v-for="project in studies" :key="project.id" :label="project.name" :value="project.id" />
+            </el-select>
+          </div>
           <div class="filter-item-form">
             <el-select v-model="filters.eventType" clearable :placeholder="TEXT.modules.adminAuditLogs.filterEvent" @change="onServerFilterChange" class="filter-select-comp">
               <el-option v-for="opt in eventTypeOptions" :key="opt.value" :label="opt.label" :value="opt.value" />
@@ -81,7 +86,6 @@
             </el-button>
             <template #dropdown>
               <el-dropdown-menu>
-                <el-dropdown-item v-if="isAdmin" command="system">{{ TEXT.modules.adminAuditLogs.exportSystem }}</el-dropdown-item>
                 <el-dropdown-item v-if="canProjectExport" command="project">{{ TEXT.modules.adminAuditLogs.exportProject }}</el-dropdown-item>
               </el-dropdown-menu>
             </template>
@@ -92,26 +96,24 @@
       <!-- 日志表格 -->
       <div class="unified-section table-section">
         <el-table :data="logs" v-loading="loading" class="audit-table" style="width: 100%" table-layout="fixed">
-          <el-table-column prop="timestamp" :label="TEXT.modules.adminAuditLogs.columns.time" width="155">
+          <el-table-column prop="timestamp" :label="TEXT.modules.adminAuditLogs.columns.time" width="150">
             <template #default="scope">
               <span class="time-text">{{ displayDateTime(scope.row.timestamp) }}</span>
             </template>
           </el-table-column>
-          <el-table-column prop="actorName" :label="TEXT.modules.adminAuditLogs.columns.actor" width="130">
+          <el-table-column prop="actorName" :label="TEXT.modules.adminAuditLogs.columns.actor" width="120">
             <template #default="scope">
               <div class="actor-cell">
-                <div class="actor-avatar">{{ getInitials(scope.row.actorName) }}</div>
                 <span class="actor-name">{{ scope.row.actorName }}</span>
               </div>
             </template>
           </el-table-column>
-          <el-table-column prop="eventLabel" :label="TEXT.modules.adminAuditLogs.columns.event" width="140">
+          <el-table-column prop="eventLabel" :label="TEXT.modules.adminAuditLogs.columns.event" width="145">
             <template #default="scope">
               <span class="event-tag">{{ scope.row.eventLabel }}</span>
             </template>
           </el-table-column>
-          <el-table-column prop="actionText" :label="TEXT.modules.adminAuditLogs.columns.action" show-overflow-tooltip />
-          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.target">
+          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.target" min-width="240">
             <template #default="scope">
               <div class="target-cell">
                 <span v-if="scope.row.targetTypeLabel" class="target-text">
@@ -121,7 +123,7 @@
               </div>
             </template>
           </el-table-column>
-          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.diff">
+          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.diff" min-width="360">
             <template #default="scope">
               <div v-if="scope.row.diffText?.length" class="diff-container">
                 <div v-for="(line, idx) in getDiffPreview(scope.row)" :key="idx" class="diff-line">{{ formatDiffLine(line) }}</div>
@@ -133,7 +135,7 @@
               <span v-else class="text-muted">{{ TEXT.audit.emptyValue }}</span>
             </template>
           </el-table-column>
-          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.result" width="80" align="center">
+          <el-table-column :label="TEXT.modules.adminAuditLogs.columns.result" width="76" align="center">
             <template #default="scope">
               <span class="result-badge" :class="scope.row.result === 'SUCCESS' ? 'result--success' : 'result--fail'">
                 {{ scope.row.resultLabel }}
@@ -199,12 +201,12 @@
             </span>
           </div>
         </div>
-        <div class="detail-meta-grid detail-meta-full">
-          <div class="meta-card meta-card-full">
+        <div class="detail-meta-grid">
+          <div class="meta-card">
             <span class="meta-label">对象</span>
             <span class="meta-value">{{ selectedLog.targetTypeLabel || TEXT.common.fallback }}<span v-if="selectedLog.targetName">：{{ selectedLog.targetName }}</span></span>
           </div>
-          <div class="meta-card meta-card-full">
+          <div class="meta-card">
             <span class="meta-label">动作</span>
             <span class="meta-value">{{ selectedLog.actionText || TEXT.common.fallback }}</span>
           </div>
@@ -215,22 +217,27 @@
           <div class="detail-section-title">
             <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="14" height="14"><path d="M12 20h9"/><path d="M16.5 3.5a2.121 2.121 0 0 1 3 3L7 19l-4 1 1-4L16.5 3.5z"/></svg>
             变更明细
-            <span class="diff-count" v-if="selectedLog.diffText?.length">{{ selectedLog.diffText.length }} 条</span>
+            <span class="diff-count" v-if="selectedDiffGroups.length">{{ selectedDiffGroups.length }} 项</span>
           </div>
           <el-scrollbar max-height="55vh">
-            <div v-if="selectedLog.diffText?.length" class="detail-lines">
-              <div v-for="(line, idx) in selectedLog.diffText" :key="idx" class="detail-line-row">
+            <div v-if="selectedDiffGroups.length" class="detail-lines">
+              <div v-for="(group, idx) in selectedDiffGroups" :key="`${group.title}-${idx}`" class="detail-line-row">
                 <span class="detail-line-index">{{ Number(idx) + 1 }}</span>
                 <div class="detail-line-content">
-                  <template v-if="parseDiffLine(formatDiffLine(line))">
-                    <span class="diff-field">{{ parseDiffLine(formatDiffLine(line))!.field }}</span>
-                    <div class="diff-values">
-                      <span class="diff-old">{{ parseDiffLine(formatDiffLine(line))!.oldVal }}</span>
-                      <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="12" height="12" class="diff-arrow"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
-                      <span class="diff-new">{{ parseDiffLine(formatDiffLine(line))!.newVal }}</span>
-                    </div>
-                  </template>
-                  <span v-else class="detail-line-text">{{ formatDiffLine(line) }}</span>
+                  <span v-if="group.title" class="diff-group-title">{{ group.title }}</span>
+                  <div class="diff-group-lines">
+                    <template v-for="(item, itemIdx) in group.items" :key="itemIdx">
+                      <div v-if="item.parsed" class="diff-item-row">
+                        <span class="diff-field">{{ item.parsed.field }}</span>
+                        <div class="diff-values">
+                          <span class="diff-old">{{ item.parsed.oldVal }}</span>
+                          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" width="12" height="12" class="diff-arrow"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
+                          <span class="diff-new">{{ item.parsed.newVal }}</span>
+                        </div>
+                      </div>
+                      <span v-else class="detail-line-text">{{ item.text }}</span>
+                    </template>
+                  </div>
                 </div>
               </div>
             </div>
@@ -247,10 +254,11 @@
 
 <script setup lang="ts">
 import { computed, onMounted, ref } from "vue";
-import { useRouter } from "vue-router";
+import { useRoute, useRouter } from "vue-router";
 import { ElMessage, ElMessageBox } from "element-plus";
 import { ArrowDown } from "@element-plus/icons-vue";
 import { createAuditEvent, fetchAuditLogs } from "../../api/auditLogs";
+import { fetchStudies } from "../../api/studies";
 import { fetchApiEndpointPermissions } from "../../api/projectPermissions";
 import { fetchUsers } from "../../api/users";
 import { listMembers } from "../../api/members";
@@ -263,15 +271,19 @@ import { displayDateTime } from "../../utils/display";
 import { getProjectRole, isSystemAdmin } from "../../utils/roles";
 import { isApiPermissionAllowed } from "../../utils/apiPermissionValue";
 import { TEXT } from "../../locales";
+import type { Study } from "../../types/api";
 
 const study = useStudyStore();
 const auth = useAuthStore();
 const router = useRouter();
+const route = useRoute();
 
 const loading = ref(false);
 const exportLoading = ref(false);
 const logs = ref<any[]>([]);
 const users = ref<any[]>([]);
+const studies = ref<Study[]>([]);
+const selectedStudy = ref<Study | null>(null);
 const allLogs = ref<any[]>([]);
 const permissionMatrix = ref<any | null>(null);
 const page = ref(1);
@@ -292,13 +304,6 @@ const successCount = computed(() => allLogs.value.filter(l => (l.result || 'SUCC
 const failCount = computed(() => allLogs.value.filter(l => l.result === 'FAIL').length);
 const operatorCount = computed(() => new Set(allLogs.value.map(l => l.actorId || l.actorName)).size);
 
-const getInitials = (name: string) => {
-  if (!name) return '?';
-  const parts = name.trim().split(/\s+/);
-  if (parts.length >= 2) return (parts[0][0] + parts[1][0]).toUpperCase();
-  return name.slice(0, 2).toUpperCase();
-};
-
 const formatDiffLine = (line: any): string => {
   if (typeof line === 'string') return line;
   if (line === null || line === undefined) return '-';
@@ -310,11 +315,62 @@ const formatDiffLine = (line: any): string => {
 };
 
 const parseDiffLine = (line: string): { field: string; oldVal: string; newVal: string } | null => {
-  const match = line.match(/^(.+?)：(.+?)\s*->\s*(.+)$/);
+  const match = line.match(/^(.+)[:：]\s*(.*?)\s*->\s*(.+)$/);
   if (!match) return null;
   return { field: match[1], oldVal: match[2], newVal: match[3] };
 };
 
+type DetailDiffItem = {
+  text: string;
+  parsed: { field: string; oldVal: string; newVal: string } | null;
+};
+
+type DetailDiffGroup = {
+  title: string;
+  items: DetailDiffItem[];
+};
+
+const splitGroupedDiffField = (field: string): { title: string; field: string } | null => {
+  const parts = String(field || "")
+    .split("/")
+    .map((item) => item.trim())
+    .filter(Boolean);
+  if (parts.length < 3) return null;
+  return {
+    title: parts.slice(0, -1).join(" / "),
+    field: parts[parts.length - 1],
+  };
+};
+
+const buildDetailDiffGroups = (lines: any[]): DetailDiffGroup[] => {
+  const groups: DetailDiffGroup[] = [];
+  const groupedIndex = new Map<string, DetailDiffGroup>();
+
+  lines.forEach((line) => {
+    const text = formatDiffLine(line);
+    const parsed = parseDiffLine(text);
+    const groupedField = parsed ? splitGroupedDiffField(parsed.field) : null;
+
+    if (!parsed || !groupedField) {
+      groups.push({ title: "", items: [{ text, parsed }] });
+      return;
+    }
+
+    let group = groupedIndex.get(groupedField.title);
+    if (!group) {
+      group = { title: groupedField.title, items: [] };
+      groupedIndex.set(groupedField.title, group);
+      groups.push(group);
+    }
+    group.items.push({
+      text,
+      parsed: { ...parsed, field: groupedField.field },
+    });
+  });
+
+  return groups;
+};
+
 const eventTypeOptions = Object.entries(auditDict).map(([value, cfg]) => ({
   value,
   label: cfg.label,
@@ -324,8 +380,20 @@ const resolveUserDisplayName = (u: any): string => {
 };
 
 const userOptions = computed(() => users.value.map((u: any) => ({ label: resolveUserDisplayName(u), value: u.id })));
+const selectedDiffGroups = computed(() => buildDetailDiffGroups(selectedLog.value?.diffText || []));
+const selectedStudyId = computed({
+  get: () => selectedStudy.value?.id || "",
+  set: (studyId: string) => {
+    selectedStudy.value = studies.value.find((item) => item.id === studyId) || null;
+  },
+});
 const isAdmin = computed(() => isSystemAdmin(auth.user));
-const projectRole = computed(() => getProjectRole(study.currentStudy, study.currentStudyRole));
+const projectRole = computed(() => {
+  const role = selectedStudy.value?.id === study.currentStudy?.id
+    ? study.currentStudyRole
+    : (selectedStudy.value as any)?.role_in_study || null;
+  return getProjectRole(selectedStudy.value, role);
+});
 const canProjectExport = computed(() => {
   if (isAdmin.value) return true;
   return projectRole.value === "PM" && isApiPermissionAllowed(permissionMatrix.value?.[projectRole.value]?.["audit_logs:export"]);
@@ -336,14 +404,31 @@ const canAccessAuditLogs = computed(() => {
 });
 
 const ensureAccess = () => {
+  if (!selectedStudy.value) {
+    router.replace("/admin/projects");
+    return;
+  }
   if (!canAccessAuditLogs.value) {
     router.replace(study.currentStudy ? "/project/overview" : "/admin/projects");
   }
 };
 
+const loadAvailableStudies = async () => {
+  const { data } = await fetchStudies();
+  const items = ((data as any).items || []) as Study[];
+  const availableItems = isAdmin.value ? items : items.filter((item) => item.role_in_study === "PM");
+  studies.value = availableItems;
+  const queryProjectId = typeof route.query.projectId === "string" ? route.query.projectId : "";
+  selectedStudy.value =
+    availableItems.find((item) => item.id === queryProjectId) ||
+    availableItems.find((item) => item.id === study.currentStudy?.id) ||
+    availableItems[0] ||
+    null;
+};
+
 const loadPermissionMatrix = async () => {
-  if (!study.currentStudy) return;
-  const { data } = await fetchApiEndpointPermissions(study.currentStudy.id);
+  if (!selectedStudyId.value) return;
+  const { data } = await fetchApiEndpointPermissions(selectedStudyId.value);
   permissionMatrix.value = data;
 };
 
@@ -352,8 +437,8 @@ const loadUsers = async () => {
     if (isAdmin.value) {
       const { data } = await fetchUsers({ limit: 500 });
       users.value = Array.isArray(data) ? data : (data as any).items || [];
-    } else if (study.currentStudy) {
-      const { data } = await listMembers(study.currentStudy.id, { limit: 500 });
+    } else if (selectedStudyId.value) {
+      const { data } = await listMembers(selectedStudyId.value, { limit: 500 });
       const items = Array.isArray(data) ? data : (data as any).items || [];
       users.value = items.map((m: any) => ({
         id: m.user_id,
@@ -365,30 +450,37 @@ const loadUsers = async () => {
   }
 };
 
+const fetchAuditLogPages = async (baseParams: Record<string, any> = {}) => {
+  const batchLimit = 500;
+  let skip = 0;
+  const allItems: any[] = [];
+  const params: Record<string, any> = {
+    ...baseParams,
+    skip,
+    limit: batchLimit,
+  };
+  while (true) {
+    params.skip = skip;
+    const { data } = await fetchAuditLogs(selectedStudyId.value, params);
+    const items = Array.isArray(data) ? data : (data as any).items || [];
+    allItems.push(...items);
+    if (items.length < batchLimit) break;
+    skip += items.length;
+  }
+  return allItems;
+};
+
 const loadLogs = async () => {
-  if (!study.currentStudy) return;
+  if (!selectedStudyId.value) return;
   loading.value = true;
   try {
     if (!permissionMatrix.value) {
       await loadPermissionMatrix();
     }
-    const batchLimit = 500;
-    let skip = 0;
-    const allItems: any[] = [];
-    const params: Record<string, any> = {
-      skip,
-      limit: batchLimit,
+    const allItems = await fetchAuditLogPages({
       action: filters.value.eventType || undefined,
       operator_id: filters.value.operatorId || undefined,
-    };
-    while (true) {
-      params.skip = skip;
-      const { data } = await fetchAuditLogs(study.currentStudy.id, params);
-      const items = Array.isArray(data) ? data : (data as any).items || [];
-      allItems.push(...items);
-      if (items.length < batchLimit) break;
-      skip += items.length;
-    }
+    });
     enrichLogs(allItems);
     refreshPagedLogs();
   } catch (e: any) {
@@ -448,6 +540,23 @@ const onLocalFilterChange = () => {
   refreshPagedLogs();
 };
 
+const onProjectChange = async () => {
+  permissionMatrix.value = null;
+  users.value = [];
+  allLogs.value = [];
+  logs.value = [];
+  total.value = 0;
+  page.value = 1;
+  await router.replace({
+    path: "/admin/audit-logs",
+    query: { ...route.query, projectId: selectedStudyId.value || undefined },
+  });
+  await loadPermissionMatrix().catch(() => {});
+  ensureAccess();
+  await loadUsers();
+  await loadLogs();
+};
+
 const onPageChange = (p: number) => {
   page.value = p;
   refreshPagedLogs();
@@ -470,17 +579,13 @@ const openDetail = (log: any) => {
 };
 
 const fetchAllForExport = async () => {
-  if (!study.currentStudy) return [];
+  if (!selectedStudyId.value) return [];
   exportLoading.value = true;
   try {
-    const params: Record<string, any> = {
-      skip: 0,
-      limit: 2000,
+    const items = await fetchAuditLogPages({
       action: filters.value.eventType || undefined,
       operator_id: filters.value.operatorId || undefined,
-    };
-    const { data } = await fetchAuditLogs(study.currentStudy.id, params);
-    const items = Array.isArray(data) ? data : (data as any).items || [];
+    });
     const userMap = users.value.reduce<Record<string, string>>((acc, cur) => {
       acc[cur.id] = resolveUserDisplayName(cur);
       return acc;
@@ -504,13 +609,13 @@ const fetchAllForExport = async () => {
 };
 
 const handleExportCommand = (command: string) => {
-  confirmExport(command as "system" | "project");
+  if (command === "project") confirmExport();
 };
 
-const confirmExport = async (scope: "system" | "project") => {
-  const currentStudy = study.currentStudy;
+const confirmExport = async () => {
+  const currentStudy = selectedStudy.value;
   if (!currentStudy) return;
-  if (scope === "project" && !canProjectExport.value) return;
+  if (!canProjectExport.value) return;
   const ok = await ElMessageBox.confirm(
     TEXT.modules.adminAuditLogs.exportConfirm,
     TEXT.modules.adminAuditLogs.exportConfirmTitle,
@@ -522,20 +627,10 @@ const confirmExport = async (scope: "system" | "project") => {
     ElMessage.warning(TEXT.modules.adminAuditLogs.exportEmpty);
     return;
   }
-  const fileName =
-    scope === "system"
-      ? `${TEXT.modules.adminAuditLogs.exportSystemName}_${new Date().toISOString().slice(0, 10)}`
-      : `${TEXT.modules.adminAuditLogs.exportProjectName}_${currentStudy.code || ""}_${new Date().toISOString().slice(0, 10)}`;
+  const fileName = `${TEXT.modules.adminAuditLogs.exportProjectName}_${currentStudy.code || ""}_${new Date().toISOString().slice(0, 10)}`;
   exportAuditCsv(events, { fileName });
-  await createAuditEvent(currentStudy.id, {
-    action: scope === "system" ? "AUDIT_EXPORT_SYSTEM" : "AUDIT_EXPORT_PROJECT",
-    entity_type: "audit_log",
-    entity_id: null,
-    detail: JSON.stringify(
-      { targetName: currentStudy.name, scope, exportedCount: events.length },
-      null,
-      0
-    ),
+  await createAuditEvent(selectedStudyId.value, {
+    action: "AUDIT_EXPORT_PROJECT",
   }).catch(() => null);
 };
 
@@ -543,6 +638,7 @@ onMounted(async () => {
   if (!auth.user && auth.token) {
     await auth.fetchMe().catch(() => {});
   }
+  await loadAvailableStudies().catch(() => {});
   await loadPermissionMatrix().catch(() => {});
   ensureAccess();
   await loadUsers();
@@ -615,6 +711,7 @@ onMounted(async () => {
 }
 
 .filter-select-comp { width: 132px; }
+.filter-select-project { width: 180px; }
 .filter-select-result { width: 96px; }
 .date-range-picker-comp { width: 248px !important; }
 .filter-spacer { flex: 1; }
@@ -637,6 +734,12 @@ onMounted(async () => {
 /* 表格 */
 .table-section { padding: 0; }
 .audit-table :deep(.el-table__inner-wrapper::before) { display: none; }
+.audit-table :deep(.el-table__cell) {
+  padding: 8px 0;
+}
+.audit-table :deep(.cell) {
+  padding: 0 12px;
+}
 
 .time-text {
   font-size: 12px;
@@ -645,26 +748,11 @@ onMounted(async () => {
 }
 
 .actor-cell {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-}
-
-.actor-avatar {
-  width: 26px;
-  height: 26px;
-  border-radius: 7px;
-  background: linear-gradient(135deg, var(--ctms-primary), var(--ctms-primary-active));
-  color: #fff;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  font-size: 10px;
-  font-weight: 700;
-  flex-shrink: 0;
+  min-width: 0;
 }
 
 .actor-name {
+  display: block;
   font-size: 13px;
   white-space: nowrap;
   overflow: hidden;
@@ -692,6 +780,23 @@ onMounted(async () => {
   font-size: 13px;
 }
 
+.target-text {
+  display: inline-flex;
+  align-items: baseline;
+  max-width: 100%;
+  min-width: 0;
+}
+
+.target-text strong {
+  flex-shrink: 0;
+}
+
+.target-text .text-muted {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 .text-muted { color: var(--ctms-text-secondary); font-size: 12px; }
 
 .result-badge {
@@ -712,6 +817,7 @@ onMounted(async () => {
   color: var(--ctms-text-regular);
   line-height: 1.5;
   overflow: hidden;
+  max-width: 100%;
 }
 
 .diff-line {
@@ -775,10 +881,6 @@ onMounted(async () => {
   margin-bottom: 10px;
 }
 
-.detail-meta-full {
-  grid-template-columns: 1fr;
-}
-
 .meta-card {
   display: flex;
   flex-direction: column;
@@ -789,10 +891,6 @@ onMounted(async () => {
   background: var(--ctms-neutral-100);
 }
 
-.meta-card-full {
-  grid-column: 1 / -1;
-}
-
 .meta-label {
   font-size: 11px;
   color: var(--ctms-text-secondary);
@@ -875,12 +973,35 @@ onMounted(async () => {
   min-width: 0;
 }
 
+.diff-group-title {
+  display: block;
+  font-size: 13px;
+  font-weight: 700;
+  color: var(--ctms-primary);
+  margin-bottom: 8px;
+  word-break: break-word;
+}
+
+.diff-group-lines {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.diff-item-row {
+  display: grid;
+  grid-template-columns: minmax(72px, 128px) minmax(0, 1fr);
+  gap: 10px;
+  align-items: start;
+}
+
 .diff-field {
   display: inline-block;
   font-size: 12px;
   font-weight: 600;
-  color: var(--ctms-primary);
-  margin-bottom: 4px;
+  color: var(--ctms-text-regular);
+  line-height: 1.8;
+  word-break: break-word;
 }
 
 .diff-values {
@@ -936,5 +1057,6 @@ onMounted(async () => {
 @media (max-width: 768px) {
   .stats-row { grid-template-columns: repeat(2, 1fr); }
   .filter-form { flex-wrap: wrap; }
+  .diff-item-row { grid-template-columns: 1fr; gap: 4px; }
 }
 </style>
diff --git a/frontend/src/views/admin/Projects.test.ts b/frontend/src/views/admin/Projects.test.ts
index fbdb98b8..5f3620ec 100644
--- a/frontend/src/views/admin/Projects.test.ts
+++ b/frontend/src/views/admin/Projects.test.ts
@@ -120,4 +120,10 @@ describe("project management access", () => {
     expect(projects).not.toContain('audit_export: { read: "audit_logs:read", write: "audit_logs:read" }');
     expect(router).not.toContain('audit_export: { read: "audit_logs:read", write: "audit_logs:read" }');
   });
+
+  it("opens audit logs with an explicit project id", () => {
+    const projects = readProjects();
+
+    expect(projects).toContain('await enterStudy(row, `/admin/audit-logs?projectId=${row.id}`)');
+  });
 });
diff --git a/frontend/src/views/admin/Projects.vue b/frontend/src/views/admin/Projects.vue
index c1325451..a68a4c44 100644
--- a/frontend/src/views/admin/Projects.vue
+++ b/frontend/src/views/admin/Projects.vue
@@ -258,7 +258,7 @@ const goPermissions = (row: Study) => {
 };
 
 const goAuditLogs = async (row: Study) => {
-  await enterStudy(row, "/admin/audit-logs");
+  await enterStudy(row, `/admin/audit-logs?projectId=${row.id}`);
 };
 
 const handleDelete = async (study: Study) => {