diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
index bda42b503..b96a4c949 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
@@ -361,6 +361,10 @@ namespace SqlSugar
         public override string ToString(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];
+            if (IsSqlServerModel(model)) 
+            {
+                return base.ToString(model);
+            }
             return string.Format(" CAST({0} AS VARCHAR)", parameter.MemberName);
         }