diff --git a/apps/portal/serializers/portal.py b/apps/portal/serializers/portal.py
index 65714b45897..f45da17acd2 100644
--- a/apps/portal/serializers/portal.py
+++ b/apps/portal/serializers/portal.py
@@ -149,6 +149,8 @@ def edit(self, instance, with_valid=True):
         file_fields = ["logo", "id", "create_time", "update_time"]
         for field, value in instance.items():
             if hasattr(portal, field) and field not in file_fields:
+                if field == "auth_config" and isinstance(value, dict):
+                    value = {**(portal.auth_config or {}), **value}
                 setattr(portal, field, value)
         for field_name in ["logo"]:
             if field_name in instance: