diff --git a/cmdb-api/api/lib/cmdb/value.py b/cmdb-api/api/lib/cmdb/value.py
index 967a2fc..590fa8e 100644
--- a/cmdb-api/api/lib/cmdb/value.py
+++ b/cmdb-api/api/lib/cmdb/value.py
@@ -166,7 +166,7 @@ class AttributeValueManager(object):
                     else:
                         existed_attr.update(value=value)
 
-                    AttributeValueManager._write_change(ci.id, attr.id, OperateType.UPDATE, existed_value, value)
+                    self._write_change(ci.id, attr.id, OperateType.UPDATE, existed_value, value)
 
     @staticmethod
     def delete_attr_value(attr_id, ci_id):