diff --git a/backend/apps/accounts/urls.py b/backend/apps/accounts/urls.py
index 1de2e2a..a525998 100644
--- a/backend/apps/accounts/urls.py
+++ b/backend/apps/accounts/urls.py
@@ -8,5 +8,6 @@ urlpatterns = [
     path('login', views.login_view, name='login'),
     path('token/refresh', TokenRefreshView.as_view(), name='token_refresh'),
     path('me', views.me_view, name='me'),
+    path('logout', views.logout_view, name='logout'),
     path('change-password', views.change_password_view, name='change_password'),
 ]
diff --git a/backend/apps/accounts/views.py b/backend/apps/accounts/views.py
index 085a5c8..ddeb232 100644
--- a/backend/apps/accounts/views.py
+++ b/backend/apps/accounts/views.py
@@ -154,6 +154,19 @@ def login_view(request):
     })
 
 
+@api_view(['POST'])
+@permission_classes([IsAuthenticated])
+def logout_view(request):
+    """POST /api/v1/auth/logout — 清除当前会话，标记用户离线。"""
+    session_id = getattr(request, 'session_id', None)
+    if session_id:
+        ActiveSession.objects.filter(user=request.user, session_id=session_id).delete()
+    else:
+        # fallback: 清除该用户所有会话
+        ActiveSession.objects.filter(user=request.user).delete()
+    return Response({'detail': 'ok'})
+
+
 @api_view(['GET'])
 @permission_classes([IsAuthenticated])
 def me_view(request):
diff --git a/backend/apps/generation/views.py b/backend/apps/generation/views.py
index 57bcfc1..b47b3dd 100644
--- a/backend/apps/generation/views.py
+++ b/backend/apps/generation/views.py
@@ -8,7 +8,7 @@ from rest_framework.response import Response
 from django.contrib.auth import get_user_model
 from django.utils import timezone
 from django.db import transaction
-from django.db.models import Sum, Q, F, Count
+from django.db.models import Sum, Q, F, Count, Exists, OuterRef
 from django.db.models.functions import TruncDate
 from django.db.utils import OperationalError as DbOperationalError
 from datetime import timedelta
@@ -22,7 +22,7 @@ from .serializers import (
     TeamAdminCreateSerializer, TeamMemberCreateSerializer, MemberQuotaSerializer,
     TeamAnomalyConfigSerializer,
 )
-from apps.accounts.models import Team, AdminAuditLog, log_admin_action, TeamAnomalyConfig, LoginAnomaly
+from apps.accounts.models import Team, AdminAuditLog, log_admin_action, TeamAnomalyConfig, LoginAnomaly, ActiveSession
 from apps.accounts.permissions import IsSuperAdmin, IsTeamAdmin, IsTeamMember
 from utils.tos_client import upload_file as tos_upload
 from utils.airdrama_client import create_task, query_task, extract_video_url, map_status
@@ -850,6 +850,7 @@ def admin_team_detail_view(request, team_id):
             'generation_records__cost_amount',
             filter=Q(generation_records__created_at__date__gte=first_of_month),
         ),
+        is_online=Exists(ActiveSession.objects.filter(user_id=OuterRef('pk'))),
     ).order_by('-date_joined')
 
     # TeamAnomalyConfig
@@ -911,6 +912,7 @@ def admin_team_detail_view(request, team_id):
             'generations_this_month': m.generations_this_month or 0,
             'spent_today': float(m.spent_today or 0),
             'spent_this_month': float(m.spent_this_month or 0),
+            'is_online': m.is_online,
             'date_joined': m.date_joined.isoformat(),
         } for m in members],
     })
@@ -1121,6 +1123,7 @@ def admin_users_list_view(request):
             'generation_records__cost_amount',
             filter=Q(generation_records__created_at__date__gte=first_of_month),
         ),
+        is_online=Exists(ActiveSession.objects.filter(user_id=OuterRef('pk'))),
     )
 
     if search:
@@ -1159,6 +1162,7 @@ def admin_users_list_view(request):
             'generations_this_month': u.generations_this_month or 0,
             'spent_today': float(u.spent_today or 0),
             'spent_this_month': float(u.spent_this_month or 0),
+            'is_online': u.is_online,
         })
 
     return Response({
@@ -1859,6 +1863,7 @@ def team_members_list_view(request):
             'generation_records__cost_amount',
             filter=Q(generation_records__created_at__date__gte=first_of_month),
         ),
+        is_online=Exists(ActiveSession.objects.filter(user_id=OuterRef('pk'))),
     ).order_by('-date_joined')
 
     return Response({
@@ -1878,6 +1883,7 @@ def team_members_list_view(request):
             'generations_this_month': m.generations_this_month or 0,
             'spent_today': float(m.spent_today or 0),
             'spent_this_month': float(m.spent_this_month or 0),
+            'is_online': m.is_online,
             'date_joined': m.date_joined.isoformat(),
         } for m in members],
     })
@@ -2311,6 +2317,7 @@ def admin_assets_team_members(request, team_id):
             'is_team_admin': member.is_team_admin,
             'video_count': video_count,
             'seconds_consumed': seconds_consumed,
+            'is_online': ActiveSession.objects.filter(user=member).exists(),
         })
 
     return Response({
@@ -2390,6 +2397,7 @@ def team_assets_overview(request):
             'is_team_admin': member.is_team_admin,
             'video_count': video_count,
             'seconds_consumed': seconds_consumed,
+            'is_online': ActiveSession.objects.filter(user=member).exists(),
         })
 
     return Response({
diff --git a/web/src/pages/AdminAssetsPage.tsx b/web/src/pages/AdminAssetsPage.tsx
index c17c511..7e39284 100644
--- a/web/src/pages/AdminAssetsPage.tsx
+++ b/web/src/pages/AdminAssetsPage.tsx
@@ -171,6 +171,11 @@ export function AdminAssetsPage() {
                       <div className={styles.memberItem} onClick={() => toggleMember(member.id)}>
                         <Chevron open={expandedMember === member.id} />
                         <span className={styles.memberName}>
+                          <span style={{
+                            display: 'inline-block', width: 8, height: 8, borderRadius: '50%',
+                            background: member.is_online ? '#00b894' : '#555', marginRight: 6,
+                            verticalAlign: 'middle',
+                          }} />
                           {member.username}
                           {member.is_team_admin && <span className={styles.adminBadge}>管理员</span>}
                         </span>
diff --git a/web/src/pages/TeamAssetsPage.tsx b/web/src/pages/TeamAssetsPage.tsx
index 4b4072e..e92877d 100644
--- a/web/src/pages/TeamAssetsPage.tsx
+++ b/web/src/pages/TeamAssetsPage.tsx
@@ -134,6 +134,11 @@ export function TeamAssetsPage() {
             <div className={styles.accordionHeader} onClick={() => toggleMember(member.id)}>
               <Chevron open={expandedMember === member.id} />
               <span className={styles.accordionName}>
+                <span style={{
+                  display: 'inline-block', width: 8, height: 8, borderRadius: '50%',
+                  background: member.is_online ? '#00b894' : '#555', marginRight: 6,
+                  verticalAlign: 'middle',
+                }} />
                 {member.username}
                 {member.is_team_admin && <span className={styles.adminBadge}>管理员</span>}
               </span>
diff --git a/web/src/pages/TeamMembersPage.tsx b/web/src/pages/TeamMembersPage.tsx
index 3e0a035..fabe3ea 100644
--- a/web/src/pages/TeamMembersPage.tsx
+++ b/web/src/pages/TeamMembersPage.tsx
@@ -138,7 +138,14 @@ export function TeamMembersPage() {
             ) : (
               members.map((m) => (
                 <tr key={m.id}>
-                  <td>{m.username}</td>
+                  <td>
+                    <span style={{
+                      display: 'inline-block', width: 8, height: 8, borderRadius: '50%',
+                      background: m.is_online ? '#00b894' : '#555', marginRight: 6,
+                      verticalAlign: 'middle',
+                    }} />
+                    {m.username}
+                  </td>
                   <td>
                     {m.is_team_admin ? (
                       <span className={styles.statusBadge} style={{ background: 'rgba(108, 99, 255, 0.15)', color: '#6c63ff' }}>管理员</span>
diff --git a/web/src/pages/TeamsPage.tsx b/web/src/pages/TeamsPage.tsx
index 2e97e5a..c1105f4 100644
--- a/web/src/pages/TeamsPage.tsx
+++ b/web/src/pages/TeamsPage.tsx
@@ -756,7 +756,14 @@ export function TeamsPage() {
                     <tbody>
                       {detailTeam.members.map((m) => (
                         <tr key={m.id}>
-                          <td>{m.username}</td>
+                          <td>
+                            <span style={{
+                              display: 'inline-block', width: 8, height: 8, borderRadius: '50%',
+                              background: m.is_online ? '#00b894' : '#555', marginRight: 6,
+                              verticalAlign: 'middle',
+                            }} />
+                            {m.username}
+                          </td>
                           <td>{m.email}</td>
                           <td>
                             {m.is_team_admin ? (
diff --git a/web/src/pages/UsersPage.tsx b/web/src/pages/UsersPage.tsx
index b5c62cf..d490dca 100644
--- a/web/src/pages/UsersPage.tsx
+++ b/web/src/pages/UsersPage.tsx
@@ -226,6 +226,11 @@ export function UsersPage() {
                 <tr key={u.id}>
                   <td>
                     <button className={styles.usernameLink} onClick={() => openDrawer(u.id)}>
+                      <span style={{
+                        display: 'inline-block', width: 8, height: 8, borderRadius: '50%',
+                        background: u.is_online ? '#00b894' : '#555', marginRight: 6,
+                        verticalAlign: 'middle',
+                      }} />
                       {u.username}
                     </button>
                   </td>
diff --git a/web/src/store/auth.ts b/web/src/store/auth.ts
index 7308fc3..2da4bcf 100644
--- a/web/src/store/auth.ts
+++ b/web/src/store/auth.ts
@@ -48,6 +48,14 @@ export const useAuthStore = create<AuthState>((set, get) => ({
   },
 
   logout: () => {
+    // 先用当前 token 通知后端清除 ActiveSession，再清本地状态
+    const token = localStorage.getItem('access_token');
+    if (token) {
+      fetch('/api/v1/auth/logout', {
+        method: 'POST',
+        headers: { 'Authorization': `Bearer ${token}`, 'Content-Type': 'application/json' },
+      }).catch(() => {});
+    }
     localStorage.removeItem('access_token');
     localStorage.removeItem('refresh_token');
     set({
diff --git a/web/src/types/index.ts b/web/src/types/index.ts
index 7b2cf9d..ce0d377 100644
--- a/web/src/types/index.ts
+++ b/web/src/types/index.ts
@@ -161,6 +161,7 @@ export interface AdminUser {
   generations_this_month: number;
   spent_today: number;
   spent_this_month: number;
+  is_online?: boolean;
 }
 
 export interface AdminUserDetail extends AdminUser {
@@ -314,6 +315,7 @@ export interface TeamMember {
   generations_this_month: number;
   spent_today: number;
   spent_this_month: number;
+  is_online?: boolean;
   date_joined: string;
 }
 
@@ -359,6 +361,7 @@ export interface AssetMemberSummary {
   video_count: number;
   seconds_consumed: number;
   cost_consumed?: number;
+  is_online?: boolean;
 }
 
 export interface AssetVideo {