diff --git a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
index ee2cb352c..bf5cda9dc 100644
--- a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
+++ b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
@@ -97,6 +97,7 @@
     <Compile Include="Models\OrderItem.cs" />
     <Compile Include="Demo\Demo0_SqlSugarClient.cs" />
     <Compile Include="Models\ViewOrder.cs" />
+    <Compile Include="UnitTest\UnitSelectN.cs" />
     <Compile Include="UnitTest\UnitOneToOneN2.cs" />
     <Compile Include="UnitTest\UnitManyToManyUpdate.cs" />
     <Compile Include="UnitTest\UnitManyToMay1231.cs" />
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs b/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs
index cb34fba3c..04c4c0cae 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs
@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UnitSelectN.Init();
             UnitOneToOneN2.Init();
             UnitManyToManyUpdate.Init();
             UnitManyToMay1231.Init();
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UnitSelectN.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UnitSelectN.cs
new file mode 100644
index 000000000..4b96e88ab
--- /dev/null
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UnitSelectN.cs
@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest 
+{
+    internal class UnitSelectN
+    {
+        public static void Init()
+        {
+            var db =  NewUnitTest.Db;
+            db.CodeFirst.InitTables<A, AA, B, BB>();
+            db.DbMaintenance.TruncateTable<A>();
+            db.DbMaintenance.TruncateTable<AA>();
+            db.DbMaintenance.TruncateTable<B>();
+            db.DbMaintenance.TruncateTable<BB>();
+            db.Insertable(new B() { BId = 1, AId = 1, BName = "a" }).ExecuteCommand();
+            var data=db.Queryable<B>()
+                .LeftJoin<A>((b, a) => b.AId == a.AId)
+                .LeftJoin<AA>((b, a, aa) => a.AId == aa.AId)
+                .LeftJoin<BB>((b, a, aa, bb) => bb.BId == b.BId)
+                .Select((b, a, aa, bb) => new
+                {
+                    B =new B() {  BId=b.BId, BName=b.BName, AId=a.AId}
+                })
+                .ToList();
+            if (data.First().B.BId != 1 && data.First().B.BName != "a") 
+            {
+                throw new Exception("unit error");
+            }
+            var data2 = db.Queryable<B>()
+            .LeftJoin<A>((b, a) => b.AId == a.AId)
+            .LeftJoin<AA>((b, a, aa) => a.AId == aa.AId)
+            .LeftJoin<BB>((b, a, aa, bb) => bb.BId == b.BId)
+            .Select((b, a, aa, bb) => new
+            {
+                B = new  { BId = b.BId, BName = b.BName, AId = a.AId }
+            })
+            .ToList();
+            if (data2.First().B.BId != 1 && data2.First().B.BName != "a")
+            {
+                throw new Exception("unit error");
+            }
+             
+        }
+        [SqlSugar.SugarTable("unita1")]
+        public class A
+        {
+            public int AId { get; set; }
+            public string AName { get; set; }
+        }
+        [SqlSugar.SugarTable("unitb1")]
+        public class B
+        {
+            public int AId { get; set; }
+            public int BId { get; set; }
+            public string BName { get; set; }
+        }
+        [SqlSugar.SugarTable("unitaa1")]
+        public class AA
+        {
+            public int AId { get; set; }
+            public int AAId { get; set; }
+            public string AAName { get; set; }
+        }
+        [SqlSugar.SugarTable("unitbb1")]
+        public class BB
+        {
+            public int BId { get; set; }
+            public int BBId { get; set; }
+            public string BBName { get; set; }
+        }
+
+        public class ADTO
+        {
+            public int AId { get; set; }
+            public int AAId { get; set; }
+            public string AName { get; set; }
+            public string AAName { get; set; }
+        }
+
+        public class BDTO
+        {
+            public int AId { get; set; }
+            public string AName { get; set; }
+            public int AAId { get; set; }
+            public string AAName { get; set; }
+            public int BId { get; set; }
+            public int BBId { get; set; }
+            public string BName { get; set; }
+            public string BBName { get; set; }
+        }
+    }
+}