diff --git a/backend/app/routers/websites.py b/backend/app/routers/websites.py
index d175367..241ec94 100644
--- a/backend/app/routers/websites.py
+++ b/backend/app/routers/websites.py
@@ -331,7 +331,16 @@ def update_website_group(
                 "name": body.name,
                 "description": body.description,
             }
-            return c.update_group(row.group_update_endpoint, group_id, payload)
+            resp = c.update_group(row.group_update_endpoint, group_id, payload)
+
+            # Sync updated group name to local group bindings cache
+            db.query(WebsiteGroupBinding).filter(
+                WebsiteGroupBinding.website_id == wid,
+                WebsiteGroupBinding.target_group_id == group_id
+            ).update({"target_group_name": body.name})
+            db.commit()
+
+            return resp
     except Exception as exc:
         raise HTTPException(502, str(exc))
 
diff --git a/backend/test_website_group_mgmt.py b/backend/test_website_group_mgmt.py
index f5799a9..7a8c489 100644
--- a/backend/test_website_group_mgmt.py
+++ b/backend/test_website_group_mgmt.py
@@ -4,7 +4,7 @@ from sqlalchemy.orm import sessionmaker
 from sqlalchemy.pool import StaticPool
 
 from app.database import Base
-from app.models.website import Website
+from app.models.website import Website, WebsiteGroupBinding
 from app.routers.websites import create_website_group, update_website_group
 from app.schemas.website import WebsiteGroupCreate, WebsiteGroupUpdate
 
@@ -40,6 +40,17 @@ def test_create_and_update_website_group(db_session, monkeypatch):
     db_session.commit()
     db_session.refresh(w)
 
+    b = WebsiteGroupBinding(
+        website_id=w.id,
+        target_group_id="g123",
+        target_group_name="OldName",
+        source_groups_json="[]",
+        enabled=True
+    )
+    db_session.add(b)
+    db_session.commit()
+    db_session.refresh(b)
+
     called_create = []
     called_update = []
 
@@ -77,3 +88,7 @@ def test_create_and_update_website_group(db_session, monkeypatch):
     assert len(called_update) == 1
     assert called_update[0][1] == "g123"
     assert called_update[0][2] == {"name": "UpdatedGroup", "description": "UpdatedDesc"}
+
+    # Verify that local binding was updated
+    db_session.refresh(b)
+    assert b.target_group_name == "UpdatedGroup"
diff --git a/frontend/src/api/index.ts b/frontend/src/api/index.ts
index 5682db7..60996e4 100644
--- a/frontend/src/api/index.ts
+++ b/frontend/src/api/index.ts
@@ -338,7 +338,7 @@ export const websitesApi = {
   test: (id: number) => api.post<{ success: boolean; message: string; detail?: string }>(`/api/websites/${id}/test`),
   groups: (id: number) => api.get<WebsiteGroup[]>(`/api/websites/${id}/groups`),
   createGroup: (id: number, data: { name: string; description?: string | null }) => api.post<any>(`/api/websites/${id}/groups`, data),
-  updateGroup: (id: number, groupId: string, data: { name: string; description?: string | null }) => api.put<any>(`/api/websites/${id}/groups/${groupId}`, data),
+  updateGroup: (id: number, groupId: string, data: { name: string; description?: string | null }) => api.put<any>(`/api/websites/${id}/groups/${encodeURIComponent(groupId)}`, data),
   importGroupsFromUpstream: (id: number, upstreamId: number, data: { group_ids: string[]; name_prefix: string }) =>
     api.post<{ success: boolean; message: string; items: ImportGroupItem[] }>(`/api/websites/${id}/groups/import-from-upstream/${upstreamId}`, data),
   syncImportedUpstreamKeys: (id: number, data: { upstream_id: number }) =>
diff --git a/frontend/src/views/Websites.vue b/frontend/src/views/Websites.vue
index 7eeb286..12f6e7f 100644
--- a/frontend/src/views/Websites.vue
+++ b/frontend/src/views/Websites.vue
@@ -1339,7 +1339,7 @@ async function saveWebsiteGroup() {
         ElMessage.success('新增成功')
       }
       groupFormVisible.value = false
-      await loadWebsiteGroups()
+      await Promise.all([loadWebsiteGroups(), loadBindings()])
     } catch (e: any) {
       ElMessage.error(e.response?.data?.detail || e.message || '保存失败')
     } finally {