diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
index 4438b3deb..7201c7847 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
@@ -726,7 +726,7 @@ AND syscomments.text LIKE '%"+tableName+"%'");
                 }
                 else if (item.DataType != null && this.Context.CurrentConnectionConfig?.MoreSettings?.SqlServerCodeFirstNvarchar == true)
                 {
-                    if (!item.DataType.ToLower().Contains("nvarchar"))
+                    if (!item.DataType.ToLower().Contains("nvarchar")&&!item.DataType.EndsWith(")"))
                     {
                         item.DataType = item.DataType.ToLower().Replace("varchar", "nvarchar");
                     }