diff --git a/backend/dvadmin/utils/serializers.py b/backend/dvadmin/utils/serializers.py
index 698d9ee..5dd9527 100644
--- a/backend/dvadmin/utils/serializers.py
+++ b/backend/dvadmin/utils/serializers.py
@@ -26,7 +26,7 @@ class CustomModelSerializer(DynamicFieldsMixin, ModelSerializer):
     # 修改人的审计字段名称, 默认modifier, 继承使用时可自定义覆盖
     modifier_field_id = "modifier"
     modifier_name = serializers.SerializerMethodField(read_only=True)
-    dept_belong_id = serializers.IntegerField(required=False, default=None)
+    dept_belong_id = serializers.IntegerField(required=False, allow_null=True)
 
     def get_modifier_name(self, instance):
         if not hasattr(instance, "modifier"):