diff --git a/backend/app/api/endpoints/users.py b/backend/app/api/endpoints/users.py
index d9f9507..12902d2 100644
--- a/backend/app/api/endpoints/users.py
+++ b/backend/app/api/endpoints/users.py
@@ -96,7 +96,7 @@ def create_user(request: CreateUserRequest, current_user: dict = Depends(get_cur
     if current_user['role_id'] != 1: # 1 is admin
         return create_api_response(code="403", message="仅管理员有权限创建用户")
 
-    if not validate_email(request.email):
+    if request.email and not validate_email(request.email):
         return create_api_response(code="400", message="邮箱格式不正确")
 
     with get_db_connection() as connection:
diff --git a/backend/app/models/models.py b/backend/app/models/models.py
index 199ecb4..22a8d50 100644
--- a/backend/app/models/models.py
+++ b/backend/app/models/models.py
@@ -34,6 +34,7 @@ class CreateUserRequest(BaseModel):
     password: Optional[str] = None
     caption: str
     email: Optional[str] = None
+    avatar_url: Optional[str] = None
     role_id: int = 2
 
 class UpdateUserRequest(BaseModel):