diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs
index 44b2ee599..ea62e7067 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs
@@ -1,5 +1,6 @@
 using System;
-
+using System.Linq;
+using System.Runtime.InteropServices;
 using SqlSugar;
 
 namespace OrmTest
@@ -19,14 +20,94 @@ namespace OrmTest
                 .Where(Country => Country.Province.City.CityId == 1)
                 .ToSqlString();//用例代码
 
-            if (!result.Contains("[City1].[ProvinceId]=[Province0].[ProvinceId]"))
+            if (!result.Contains("[UnitCity1].[ProvinceId]=[UnitProvince0].[ProvinceId]"))
+            {
+                throw new Exception("unit error");
+            }
+            db.CodeFirst.InitTables<Country, Province, City>();
+            db.DbMaintenance.TruncateTable<Country, Province, City>();
+            db.Insertable(new Country()
+            {
+                CountryId = 1,
+                ProvinceId = 1,
+            }).ExecuteCommand();
+            db.Insertable(new Province()
+            {
+                ProvinceId=1
+            }).ExecuteCommand();
+            db.Insertable(new City()
+            {
+                ProvinceId=1,
+                 CityId=1
+            }).ExecuteCommand();
+            db.Insertable(new Country()
+            {
+                CountryId = 333,
+                ProvinceId = 2,
+            }).ExecuteCommand();
+            db.Insertable(new Province()
+            {
+                ProvinceId = 2
+            }).ExecuteCommand();
+            db.Insertable(new City()
+            {
+                ProvinceId = 2,
+                CityId = 111
+            }).ExecuteCommand();
+            var result2 = db.Queryable<Country, Province, City>(
+                (co, pr, ci) => co.ProvinceId == pr.ProvinceId && ci.ProvinceId == ci.ProvinceId)
+           .Select((co, pr, ci) => new Country()
+           {
+                CountryId= co.CountryId,
+                 ProvinceId= co.ProvinceId,
+                 Province=new Province() 
+                 {
+                      ProvinceId= pr.ProvinceId,
+                       City=new City() 
+                       {
+                            ProvinceId=ci.ProvinceId,
+                             CityId=ci.CityId,
+                       }
+                 }
+           })
+           .ToList();
+
+            if (result2.First().Province.City.ProvinceId != 1||
+                result2.Last().Province.City.ProvinceId != 2) 
+            {
+                throw new Exception("unit error");
+            }
+
+            var result3 = db.Queryable<Country, Province, City>(
+               (co, pr, ci) => co.ProvinceId == pr.ProvinceId && ci.ProvinceId == ci.ProvinceId)
+          .Select((co, pr, ci) => new Country()
+          {
+              CountryId = co.CountryId,
+              ProvinceId = co.ProvinceId,
+              Province = new Province()
+              {
+                  ProvinceId = pr.ProvinceId,
+                  City = new City()
+                  {
+                      ProvinceId = ci.ProvinceId,
+                      CityId = ci.CityId,
+                  }
+              }
+          })
+          .ToList();
+
+
+            if (result3.First().Province.City.ProvinceId != 1 ||
+                result3.Last().Province.City.ProvinceId != 2)
             {
                 throw new Exception("unit error");
             }
+
         }
 
 
         //建类
+        [SugarTable("UnitCountry")]
         public class Country
         {
             [SugarColumn(IsPrimaryKey = true)]
@@ -36,7 +117,7 @@ namespace OrmTest
             [Navigate(NavigateType.OneToOne, nameof(ProvinceId))]
             public Province Province { get; set; }
         }
-
+        [SugarTable("UnitProvince")]
         public class Province
         {
             [SugarColumn(IsPrimaryKey = true)]
@@ -45,7 +126,7 @@ namespace OrmTest
             [Navigate(NavigateType.OneToOne, nameof(ProvinceId), nameof(UnitOneToOneN2.City.ProvinceId))]
             public City City { get; set; }
         }
-
+        [SugarTable("UnitCity")]
         public class City
         {
             [SugarColumn(IsPrimaryKey = true)]