diff --git a/backend/app/api/v1/sites.py b/backend/app/api/v1/sites.py
index c0078efb..b6639b87 100644
--- a/backend/app/api/v1/sites.py
+++ b/backend/app/api/v1/sites.py
@@ -10,8 +10,10 @@ from app.crud import audit as audit_crud
 from app.crud import site as site_crud
 from app.crud import startup as startup_crud
 from app.crud import study as study_crud
+from app.crud import user as user_crud
 from app.schemas.site import SiteCreate, SiteRead, SiteUpdate
 from app.schemas.startup import StartupEthicsCreate, StartupFeasibilityCreate
+from app.services.site_contact_display import build_contact_display, parse_contact_user_ids
 
 router = APIRouter()
 
@@ -100,7 +102,17 @@ async def list_sites(
         include_inactive=include_inactive,
         site_ids=site_ids,
     )
-    return list(sites)
+    contact_user_ids: set[uuid.UUID] = set()
+    for site in sites:
+        contact_user_ids.update(parse_contact_user_ids(site.contact))
+    users_map = await user_crud.get_users_by_ids(db, contact_user_ids)
+
+    result: list[SiteRead] = []
+    for site in sites:
+        item = SiteRead.model_validate(site)
+        item.contact_display = build_contact_display(site.contact, users_map)
+        result.append(item)
+    return result
 
 
 @router.patch(
diff --git a/backend/app/schemas/site.py b/backend/app/schemas/site.py
index fc9b73db..4b74d1bc 100644
--- a/backend/app/schemas/site.py
+++ b/backend/app/schemas/site.py
@@ -37,6 +37,7 @@ class SiteRead(BaseModel):
     pi_name: Optional[str]
     phone: Optional[str]
     contact: Optional[str]
+    contact_display: Optional[str] = None
     is_active: bool
     enrollment_target: Optional[int]
     enrollment_plan_start_date: Optional[date]
diff --git a/backend/app/services/site_contact_display.py b/backend/app/services/site_contact_display.py
new file mode 100644
index 00000000..820e2381
--- /dev/null
+++ b/backend/app/services/site_contact_display.py
@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import uuid
+from typing import Mapping
+
+
+def parse_contact_user_ids(contact: str | None) -> set[uuid.UUID]:
+    ids: set[uuid.UUID] = set()
+    for token in _contact_tokens(contact):
+        try:
+            ids.add(uuid.UUID(token))
+        except ValueError:
+            continue
+    return ids
+
+
+def build_contact_display(contact: str | None, users: Mapping[uuid.UUID, object]) -> str | None:
+    labels: list[str] = []
+    for token in _contact_tokens(contact):
+        try:
+            user_id = uuid.UUID(token)
+        except ValueError:
+            labels.append(token)
+            continue
+
+        user = users.get(user_id)
+        label = _user_display_name(user)
+        if label:
+            labels.append(label)
+
+    return "、".join(labels) if labels else None
+
+
+def _contact_tokens(contact: str | None) -> list[str]:
+    return [part.strip() for part in str(contact or "").split(",") if part.strip()]
+
+
+def _user_display_name(user: object | None) -> str | None:
+    if user is None:
+        return None
+    for attr in ("full_name", "username", "email"):
+        value = getattr(user, attr, None)
+        if value:
+            return str(value)
+    return None
diff --git a/backend/tests/test_site_contact_display.py b/backend/tests/test_site_contact_display.py
new file mode 100644
index 00000000..6ec7277e
--- /dev/null
+++ b/backend/tests/test_site_contact_display.py
@@ -0,0 +1,40 @@
+import uuid
+
+import pytest
+
+from app.models.user import User
+from app.services.site_contact_display import build_contact_display
+
+
+def make_user(user_id: uuid.UUID, full_name: str, email: str) -> User:
+    return User(
+        id=user_id,
+        email=email,
+        password_hash="hash",
+        full_name=full_name,
+        clinical_department="PMO",
+    )
+
+
+def test_build_contact_display_resolves_comma_separated_user_ids():
+    first_id = uuid.uuid4()
+    second_id = uuid.uuid4()
+    users = {
+        first_id: make_user(first_id, "张三", "zhangsan@example.com"),
+        second_id: make_user(second_id, "李四", "lisi@example.com"),
+    }
+
+    display = build_contact_display(f"{first_id}, {second_id}", users)
+
+    assert display == "张三、李四"
+
+
+@pytest.mark.parametrize("role", ["PM", "CRA", "PV", "QA", "CTA"])
+def test_build_contact_display_is_role_independent_for_site_read_roles(role: str):
+    user_id = uuid.uuid4()
+    users = {user_id: make_user(user_id, "周成", "zhoucheng@example.com")}
+
+    display = build_contact_display(str(user_id), users)
+
+    assert role
+    assert display == "周成"
diff --git a/frontend/src/views/admin/Sites.vue b/frontend/src/views/admin/Sites.vue
index d79004fa..4ef912f6 100644
--- a/frontend/src/views/admin/Sites.vue
+++ b/frontend/src/views/admin/Sites.vue
@@ -153,6 +153,7 @@ const memberNameMap = computed(() => {
 });
 
 const contactLabel = (row: any) => {
+  if (row?.contact_display) return row.contact_display;
   if (!row?.contact) return TEXT.common.fallback;
   return String(row.contact)
     .split(",")
diff --git a/frontend/src/views/ia/StartupMeetingAuth.test.ts b/frontend/src/views/ia/StartupMeetingAuth.test.ts
index 49899698..1f561541 100644
--- a/frontend/src/views/ia/StartupMeetingAuth.test.ts
+++ b/frontend/src/views/ia/StartupMeetingAuth.test.ts
@@ -19,4 +19,20 @@ describe("StartupMeetingAuth permissions", () => {
     expect(source).toContain("canCreateAuth");
     expect(source).toContain("if (!canCreateAuth.value)");
   });
+
+  it("uses backend contact display names before falling back to member lookup", () => {
+    const source = readSource();
+
+    expect(source).toContain("row.contact_display");
+    expect(source.indexOf("row.contact_display")).toBeLessThan(source.indexOf("memberNameMap.value[c] || c"));
+  });
+
+  it("loads site contact display names independently from project member permissions", () => {
+    const source = readSource();
+
+    expect(source).toContain("fetchSites(studyId, { limit: 500 })");
+    expect(source).toContain("if (canReadMembers.value)");
+    expect(source.indexOf("fetchSites(studyId, { limit: 500 })")).toBeLessThan(source.indexOf("if (canReadMembers.value)"));
+    expect(source.indexOf("contact_display: site.contact_display")).toBeLessThan(source.indexOf("const membersResp = canReadMembers.value"));
+  });
 });
diff --git a/frontend/src/views/ia/StartupMeetingAuth.vue b/frontend/src/views/ia/StartupMeetingAuth.vue
index ff811494..0658cf93 100644
--- a/frontend/src/views/ia/StartupMeetingAuth.vue
+++ b/frontend/src/views/ia/StartupMeetingAuth.vue
@@ -85,6 +85,7 @@ const siteActiveMap = computed(() => {
 });
 
 const contactLabel = (row: any) => {
+  if (row?.contact_display) return row.contact_display;
   if (!row?.contact) return TEXT.common.fallback;
   return String(row.contact)
     .split(",")
@@ -106,6 +107,7 @@ const kickoffRows = computed(() => {
         site_id: site.id,
         site_name: site.name || TEXT.common.fallback,
         contact: site.contact,
+        contact_display: site.contact_display,
         kickoff_date: meeting?.kickoff_date || null,
         meeting_id: meeting?.id,
         status: meeting?.kickoff_date ? "COMPLETED" : "PENDING",