diff --git a/backend/app/admin/api/v1/sys/config.py b/backend/app/admin/api/v1/sys/config.py
index a13de7de6..7a65447b1 100644
--- a/backend/app/admin/api/v1/sys/config.py
+++ b/backend/app/admin/api/v1/sys/config.py
@@ -22,7 +22,7 @@
 
 
 @router.get('/website', summary='获取网站配置信息', dependencies=[DependsJwtAuth])
-async def get_website_config() -> ResponseSchemaModel[GetConfigDetail]:
+async def get_website_config() -> ResponseSchemaModel[list[GetConfigDetail]]:
     config = await config_service.get_built_in_config('website')
     return response_base.success(data=config)
 
@@ -41,7 +41,7 @@ async def save_website_config(objs: list[SaveBuiltInConfigParam]) -> ResponseMod
 
 
 @router.get('/protocol', summary='获取用户协议', dependencies=[DependsJwtAuth])
-async def get_protocol_config() -> ResponseSchemaModel[GetConfigDetail]:
+async def get_protocol_config() -> ResponseSchemaModel[list[GetConfigDetail]]:
     config = await config_service.get_built_in_config('protocol')
     return response_base.success(data=config)
 
@@ -60,7 +60,7 @@ async def save_protocol_config(objs: list[SaveBuiltInConfigParam]) -> ResponseMo
 
 
 @router.get('/policy', summary='获取用户政策', dependencies=[DependsJwtAuth])
-async def get_policy_config() -> ResponseSchemaModel[GetConfigDetail]:
+async def get_policy_config() -> ResponseSchemaModel[list[GetConfigDetail]]:
     config = await config_service.get_built_in_config('policy')
     return response_base.success(data=config)
 
diff --git a/backend/app/admin/crud/crud_config.py b/backend/app/admin/crud/crud_config.py
index 9e6eda2e7..db0b66d5a 100644
--- a/backend/app/admin/crud/crud_config.py
+++ b/backend/app/admin/crud/crud_config.py
@@ -43,7 +43,7 @@ async def get_by_key_and_type(self, db: AsyncSession, key: str, type: str) -> Co
         """
         return await self.select_model_by_column(db, key=key, type=type)
 
-    async def get_by_key(self, db: AsyncSession, key: str, built_in: bool = False) -> Config | None:
+    async def get_by_key(self, db: AsyncSession, key: str) -> Config | None:
         """
         通过 key 获取系统配置参数
 
@@ -52,10 +52,7 @@ async def get_by_key(self, db: AsyncSession, key: str, built_in: bool = False) -
         :param built_in:
         :return:
         """
-        filters = {'key': key}
-        if not built_in:
-            filters.update({'type__not_in': admin_settings.CONFIG_BUILT_IN_TYPES})
-        return await self.select_model_by_column(db, **filters)
+        return await self.select_model_by_column(db, key=key)
 
     async def get_list(self, name: str = None, type: str = None) -> Select:
         """
diff --git a/backend/app/admin/service/config_service.py b/backend/app/admin/service/config_service.py
index 8af41dda4..6cf6d001a 100644
--- a/backend/app/admin/service/config_service.py
+++ b/backend/app/admin/service/config_service.py
@@ -28,7 +28,7 @@ async def save_built_in_config(objs: list[SaveBuiltInConfigParam], type: str) ->
             for obj in objs:
                 config = await config_dao.get_by_key_and_type(db, obj.key, type)
                 if config is None:
-                    if await config_dao.get_by_key(db, obj.key, built_in=True):
+                    if await config_dao.get_by_key(db, obj.key):
                         raise errors.ForbiddenError(msg=f'参数配置 {obj.key} 已存在')
                     await config_dao.create_model(db, obj, flush=True, type=type)
                 else:
@@ -62,6 +62,10 @@ async def update(*, pk: int, obj: UpdateConfigParam) -> int:
             config = await config_dao.get(db, pk)
             if not config:
                 raise errors.NotFoundError(msg='参数配置不存在')
+            if config.key != obj.key:
+                config = await config_dao.get_by_key(db, obj.key)
+                if config:
+                    raise errors.ForbiddenError(msg=f'参数配置 {obj.key} 已存在')
             count = await config_dao.update(db, pk, obj)
             return count