diff --git a/app/schemas/user.py b/app/schemas/user.py
index 2c1eebb..ed2f508 100644
--- a/app/schemas/user.py
+++ b/app/schemas/user.py
@@ -18,8 +18,6 @@ class UserCreate(UserBase):
 
 class UserUpdate(UserBase):
     """更新用户请求模型"""
-    openid: Optional[str] = None
-    unionid: Optional[str] = None
     avatar: Optional[str] = None
     nickname: Optional[str] = None
 
diff --git a/app/services/user.py b/app/services/user.py
index 8237896..6484c83 100644
--- a/app/services/user.py
+++ b/app/services/user.py
@@ -48,7 +48,8 @@ async def update_user(db: AsyncSession, user_id: int, user_update: UserUpdate):
         
     # 更新用户数据
     for key, value in update_data.items():
-        setattr(db_user, key, value)
+        if value is not None:
+            setattr(db_user, key, value)
     
     await db.commit()
     await db.refresh(db_user)