diff --git a/Src/Asp.Net/AccessTest/AccessTest.csproj b/Src/Asp.Net/AccessTest/AccessTest.csproj
index 0f2870498..ad9c0562a 100644
--- a/Src/Asp.Net/AccessTest/AccessTest.csproj
+++ b/Src/Asp.Net/AccessTest/AccessTest.csproj
@@ -82,6 +82,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Unit\UInsert3.cs" />
     <Compile Include="Unit\UnitInsertNavN.cs" />
+    <Compile Include="Unit\UnitOneToOneN.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config">
diff --git a/Src/Asp.Net/AccessTest/Unit/UnitOneToOneN.cs b/Src/Asp.Net/AccessTest/Unit/UnitOneToOneN.cs
new file mode 100644
index 000000000..fd67d723b
--- /dev/null
+++ b/Src/Asp.Net/AccessTest/Unit/UnitOneToOneN.cs
@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SqlSugar;
+namespace OrmTest
+{
+    public class UnitOneToOneN
+    {
+        public static void Init() 
+        {
+            //创建数据库对象
+            SqlSugarClient db = new SqlSugarClient(new ConnectionConfig()
+            {
+                ConnectionString = Config.ConnectionString,//Master Connection
+                DbType = DbType.Access,
+                InitKeyType = InitKeyType.Attribute,
+                IsAutoCloseConnection = true
+            });
+            db.Aop.OnLogExecuting = (sql, pars) =>
+            {
+                Console.WriteLine(UtilMethods.GetSqlString(db.CurrentConnectionConfig.DbType, sql, pars));//输出sql,查看执行sql 性能无影响
+            };
+
+
+            //建表 
+
+            if (!db.DbMaintenance.IsAnyTable("StudentA", false))
+
+            {
+
+                db.CodeFirst.InitTables<StudentA>();
+
+            }
+
+            if (!db.DbMaintenance.IsAnyTable("SchoolA", false))
+
+            {
+
+                db.CodeFirst.InitTables<SchoolA>();
+
+            }
+
+            if (!db.DbMaintenance.IsAnyTable("RoomA", false))
+
+            {
+
+                db.CodeFirst.InitTables<RoomA>();
+
+            }
+            db.Deleteable<StudentA>().ExecuteCommand();
+            db.Deleteable<SchoolA>().ExecuteCommand();
+            db.Insertable(new StudentA() { SchoolNo = 100, StudentId = 0 }).ExecuteCommand();
+            db.Insertable(new SchoolA() { SchoolId = 100, RoomId = 1 }).ExecuteCommand();
+
+            //用例代码 
+
+            var result = db.Queryable<StudentA>()
+
+               .Includes(x => x.School)
+
+               .ToList();
+
+            if (result.First().School==null) 
+            {
+                throw new Exception("unit error");
+            }
+        }
+
+        public class StudentA
+
+        {
+
+            [SugarColumn(IsPrimaryKey = true)]
+
+            public int StudentId { get; set; }
+
+            public int SchoolNo { get; set; }
+
+            [Navigate(NavigateType.OneToOne, nameof(SchoolNo) )]
+
+            public SchoolA School { get; set; }
+
+
+
+        }
+
+        public class SchoolA
+
+        {
+
+            [SugarColumn(IsPrimaryKey = true)]
+
+            public int SchoolId { get; set; }
+
+            public int SchoolNo { get; set; }
+
+            public int RoomId { get; set; }
+
+            [Navigate(NavigateType.OneToOne, nameof(RoomId))]
+
+            public RoomA Room { get; set; }
+
+        }
+
+        public class RoomA
+
+        {
+
+            [SugarColumn(IsPrimaryKey = true)]
+
+            public int RoomId { get; set; }
+
+        }
+    }
+}