diff --git a/Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase02.cs b/Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase02.cs
index 3afead403..596ec6e4e 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase02.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase02.cs
@@ -51,6 +51,7 @@ namespace OrmTest
             {
 
             };
+            db.DbMaintenance.TruncateTable<UnitIndexaa1>();
             db.Insertable(new UnitIndexaa1() { id = 1 }).ExecuteCommand();
             db.Updateable(new UnitIndexaa1() { id = 1 }).ExecuteCommand();
         }