diff --git a/backend/apps/monitor/views.py b/backend/apps/monitor/views.py
index 31f1199..c0bbf24 100644
--- a/backend/apps/monitor/views.py
+++ b/backend/apps/monitor/views.py
@@ -610,7 +610,11 @@ def iam_user_project_add_view(request, pk):
                                               d['project_name'])
                 attached.append(policy_name)
             except VolcengineAPIError as e:
-                auth_errors.append(f"{policy_name}: {e}")
+                if 'PolicyAttachConflict' in str(e):
+                    # 全局已有此策略，项目级无需重复附加，视为成功
+                    attached.append(policy_name)
+                else:
+                    auth_errors.append(f"{policy_name}: {e}")
 
         obj.attached_policies = attached
         obj.save(update_fields=['attached_policies'])