diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
index 2513f7699..314223a40 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
@@ -232,7 +232,7 @@ namespace OrmTest
                 .Where(x=>x.SchoolA.SchoolId==1)
                 .Where(x => x.SchoolA.City.Id == 1)
                 .ToList();
-            db.QueryFilter = new QueryFilterProvider();
+            db.QueryFilter.Clear();
             db.DbMaintenance.TruncateTable<StudentA, RoomA, BookA>();
 
             //开发中