diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UInsert2.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UInsert2.cs
index 63a95716d..2be09a22e 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UInsert2.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UInsert2.cs
@@ -16,8 +16,18 @@ namespace OrmTest
             db.Insertable(new UnitInsertMethod() { Name = "2" }).CallEntityMethod(it => it.Create("admin")).ExecuteCommand();
             db.Updateable(new UnitInsertMethod() {Id=1, Name = "1" }).CallEntityMethod(it => it.Create()).ExecuteCommand();
             db.Updateable(new UnitInsertMethod() { Name = "1" }).CallEntityMethod(it => it.Create("admint")).ExecuteCommand();
+            db.CodeFirst.InitTables<Unitsdafa111>();
+            db.Insertable(new Unitsdafa111()).ExecuteCommand();
+            db.Insertable(new Unitsdafa111() {Id=Guid.NewGuid(),Id2=Guid.NewGuid() }).ExecuteCommand();
+            var list=db.Queryable<Unitsdafa111>().ToList();
+        }
+        public class Unitsdafa111
+        {
+            [SqlSugar.SugarColumn(IsNullable =true,ColumnDataType ="nvarchar(50)")]
+            public Guid Id { get; set; }
+            [SqlSugar.SugarColumn(IsNullable = true, ColumnDataType = "nvarchar(50)")]
+            public Guid? Id2 { get; set; }
         }
-
         public class UnitInsertMethod
         {
             [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
diff --git a/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/DbBindProvider.cs b/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/DbBindProvider.cs
index af742f434..497f4c6f4 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/DbBindProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/DbBindProvider/DbBindProvider.cs
@@ -314,7 +314,7 @@ namespace SqlSugar
         {
             get
             {
-                return new List<string>() { "int32", "datetime", "decimal", "double", "byte", "guid" };
+                return new List<string>() { "int32", "datetime", "decimal", "double", "byte" };
             }
         }
         #endregion