diff --git a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
index e6d6b6dae..ee2cb352c 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\UnitOneToOneN2.cs" />
     <Compile Include="UnitTest\UnitManyToManyUpdate.cs" />
     <Compile Include="UnitTest\UnitManyToMay1231.cs" />
     <Compile Include="UnitTest\UnitOneToOneN.cs" />
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs b/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs
index 545951f3d..cb34fba3c 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()
         {
+            UnitOneToOneN2.Init();
             UnitManyToManyUpdate.Init();
             UnitManyToMay1231.Init();
             UnitUpdateNav2.Init();
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs
new file mode 100644
index 000000000..982830eb8
--- /dev/null
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UnitOneToOneN2.cs
@@ -0,0 +1,56 @@
+using System;
+
+using SqlSugar;
+
+namespace OrmTest
+{
+    public static class UnitOneToOneN2
+    {
+        public  static void Init()
+        {
+            var db = NewUnitTest.Db;
+
+            ////建表 
+            //db.CodeFirst.InitTables<Country, Province, City>();
+            //db.DbMaintenance.TruncateTable<Country, Province, City>();
+
+            //用例代码 
+            var result = db.Queryable<Country>()
+                .Where(Country => Country.Province.City.CityId == 1)
+                .ToSqlString();//用例代码
+
+            if (!result.Contains("City1.[ProvinceId]=Province0.[ProvinceId]"))
+            {
+                throw new Exception("unit error");
+            }
+        }
+
+
+        //建类
+        public class Country
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int CountryId { get; set; }
+            public int ProvinceId { get; set; }
+            [SugarColumn(IsIgnore = true)]
+            [Navigate(NavigateType.OneToOne, nameof(ProvinceId))]
+            public Province Province { get; set; }
+        }
+
+        public class Province
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int ProvinceId { get; set; }
+            [SugarColumn(IsIgnore = true)]
+            [Navigate(NavigateType.OneToOne, nameof(ProvinceId), nameof(UnitOneToOneN2.City.ProvinceId))]
+            public City City { get; set; }
+        }
+
+        public class City
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int CityId { get; set; }
+            public int ProvinceId { get; set; }
+        }
+    }
+}
\ No newline at end of file