diff --git a/backend/app/crud/study.py b/backend/app/crud/study.py
index f3e4a130..b85c7537 100644
--- a/backend/app/crud/study.py
+++ b/backend/app/crud/study.py
@@ -1,7 +1,7 @@
 import uuid
 from typing import Sequence
 
-from sqlalchemy import select, update
+from sqlalchemy import select, update as sa_update
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.models.study import Study
@@ -38,7 +38,7 @@ async def update(db: AsyncSession, study: Study, study_in: StudyUpdate) -> Study
     update_data = study_in.model_dump(exclude_unset=True)
     if update_data:
         await db.execute(
-            update(Study)
+            sa_update(Study)
             .where(Study.id == study.id)
             .values(**update_data)
         )
diff --git a/frontend/src/views/admin/ProjectMembers.vue b/frontend/src/views/admin/ProjectMembers.vue
index c12d452f..e80f535f 100644
--- a/frontend/src/views/admin/ProjectMembers.vue
+++ b/frontend/src/views/admin/ProjectMembers.vue
@@ -3,14 +3,15 @@
     <el-card>
       <div class="header">
         <div>
-          <h3>项目成员配置</h3>
+          <h3>项目成员配置（角色仅在当前项目内生效）</h3>
           <div class="sub" v-if="project">项目：{{ project.code }} - {{ project.name }}</div>
+          <div class="sub">同一账号在不同项目可拥有不同角色，角色授权仅在本页进行</div>
         </div>
         <el-button type="primary" @click="openAdd">新增成员</el-button>
       </div>
       <el-table :data="memberRows" v-loading="loading" stripe>
         <el-table-column prop="username" label="用户名" min-width="160" />
-        <el-table-column prop="role_in_study" label="角色" width="120">
+        <el-table-column prop="role_in_study" label="项目角色" width="140">
           <template #default="scope">
             <el-tag>{{ scope.row.role_in_study }}</el-tag>
           </template>
@@ -33,6 +34,9 @@
             >
               <el-option label="PM" value="PM" />
               <el-option label="CRA" value="CRA" />
+              <el-option label="PV" value="PV" />
+              <el-option label="IMP" value="IMP" />
+              <el-option label="ADMIN" value="ADMIN" />
             </el-select>
             <el-button
               link
@@ -54,7 +58,7 @@
             <el-option
               v-for="user in availableUsers"
               :key="user.id"
-              :label="`${user.username} (${user.role})`"
+              :label="user.username"
               :value="user.id"
               :disabled="!user.is_active"
             />
@@ -64,6 +68,9 @@
           <el-select v-model="newMember.role_in_study" placeholder="请选择角色">
             <el-option label="PM" value="PM" />
             <el-option label="CRA" value="CRA" />
+            <el-option label="PV" value="PV" />
+            <el-option label="IMP" value="IMP" />
+            <el-option label="ADMIN" value="ADMIN" />
           </el-select>
         </el-form-item>
       </el-form>
diff --git a/frontend/src/views/admin/Projects.vue b/frontend/src/views/admin/Projects.vue
index a6507a05..88d1a48c 100644
--- a/frontend/src/views/admin/Projects.vue
+++ b/frontend/src/views/admin/Projects.vue
@@ -2,7 +2,10 @@
   <div class="page">
     <el-card>
       <div class="header">
-        <h3>项目管理</h3>
+        <div>
+          <h3>项目治理</h3>
+          <p class="sub">项目是独立业务实体，账号加入项目后才成为项目成员（角色在成员配置中设置）</p>
+        </div>
         <el-button type="primary" @click="openCreate">新建项目</el-button>
       </div>
       <el-table :data="projects" v-loading="loading" stripe>
@@ -18,7 +21,7 @@
         <el-table-column label="操作" width="320" fixed="right">
           <template #default="scope">
             <el-button link type="primary" size="small" @click="openEdit(scope.row)">编辑</el-button>
-            <el-button link type="primary" size="small" @click="goMembers(scope.row)">成员配置</el-button>
+            <el-button link type="primary" size="small" @click="goMembers(scope.row)">项目账号/成员配置</el-button>
             <el-button link type="primary" size="small" @click="goSites(scope.row)">中心管理</el-button>
             <el-button link type="success" size="small" @click="enterStudy(scope.row)">进入项目</el-button>
           </template>
@@ -110,4 +113,8 @@ onMounted(() => {
   justify-content: space-between;
   margin-bottom: 12px;
 }
+.sub {
+  color: #666;
+  margin-top: 4px;
+}
 </style>
diff --git a/frontend/src/views/admin/UserForm.vue b/frontend/src/views/admin/UserForm.vue
index 169ffcab..eeda2332 100644
--- a/frontend/src/views/admin/UserForm.vue
+++ b/frontend/src/views/admin/UserForm.vue
@@ -4,15 +4,6 @@
       <el-form-item label="用户名" prop="username">
         <el-input v-model="form.username" :disabled="!!user" placeholder="请输入用户名" />
       </el-form-item>
-      <el-form-item label="角色" prop="role">
-        <el-select v-model="form.role" placeholder="请选择角色">
-          <el-option label="ADMIN" value="ADMIN" />
-          <el-option label="PM" value="PM" />
-          <el-option label="CRA" value="CRA" />
-          <el-option label="PV" value="PV" />
-          <el-option label="IMP" value="IMP" />
-        </el-select>
-      </el-form-item>
       <el-form-item :label="user ? '新密码（可选）' : '初始密码'" prop="password">
         <el-input v-model="form.password" type="password" show-password :placeholder="user ? '留空则不修改密码' : '请输入初始密码'" />
       </el-form-item>
@@ -52,14 +43,12 @@ const formRef = ref<FormInstance>();
 const submitting = ref(false);
 const form = reactive({
   username: "",
-  role: "PM",
   password: "",
   is_active: true,
 });
 
 const rules = reactive<FormRules>({
   username: [{ required: true, message: "请输入用户名", trigger: "blur" }],
-  role: [{ required: true, message: "请选择角色", trigger: "change" }],
   password: [
     {
       validator: (_rule, value, callback) => {
@@ -76,7 +65,6 @@ const rules = reactive<FormRules>({
 
 const resetForm = () => {
   form.username = "";
-  form.role = "PM";
   form.password = "";
   form.is_active = true;
 };
@@ -88,7 +76,6 @@ watch(
       resetForm();
       if (props.user) {
         form.username = props.user.username;
-        form.role = props.user.role;
         form.is_active = props.user.is_active;
       }
     }
@@ -102,7 +89,6 @@ const onSubmit = async () => {
   try {
     if (props.user) {
       await updateUser(props.user.id, {
-        role: form.role,
         is_active: form.is_active,
         password: form.password || undefined,
       });
@@ -110,7 +96,7 @@ const onSubmit = async () => {
     } else {
       await createUser({
         username: form.username,
-        role: form.role,
+        role: "PV",
         password: form.password,
       });
       ElMessage.success("用户已创建");
diff --git a/frontend/src/views/admin/Users.vue b/frontend/src/views/admin/Users.vue
index f1f4ac0b..2e55ba0c 100644
--- a/frontend/src/views/admin/Users.vue
+++ b/frontend/src/views/admin/Users.vue
@@ -2,17 +2,14 @@
   <div class="page">
     <el-card>
       <div class="header">
-        <h3>用户账号管理</h3>
+        <div>
+          <h3>账号治理（系统登录账号）</h3>
+          <p class="sub">账号用于登录系统，本身不具备项目或角色权限</p>
+        </div>
         <el-button type="primary" @click="openCreate">新建用户</el-button>
       </div>
       <el-table :data="users" stripe v-loading="loading" style="width: 100%">
         <el-table-column prop="username" label="用户名" min-width="140" />
-        <el-table-column prop="role" label="角色" width="120">
-          <template #default="scope">
-            <el-tag type="success" v-if="scope.row.role === 'ADMIN'">ADMIN</el-tag>
-            <el-tag v-else>{{ scope.row.role }}</el-tag>
-          </template>
-        </el-table-column>
         <el-table-column label="状态" width="120">
           <template #default="scope">
             <el-tag type="success" v-if="scope.row.is_active">启用</el-tag>
@@ -134,6 +131,10 @@ onMounted(() => {
   justify-content: space-between;
   margin-bottom: 12px;
 }
+.sub {
+  color: #666;
+  margin-top: 4px;
+}
 .pagination {
   margin-top: 12px;
   text-align: right;
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