diff --git a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
index 91b6aa48d..e6d6b6dae 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\UnitManyToManyUpdate.cs" />
     <Compile Include="UnitTest\UnitManyToMay1231.cs" />
     <Compile Include="UnitTest\UnitOneToOneN.cs" />
     <Compile Include="UnitTest\UCustom024.cs" />
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs b/Src/Asp.Net/SqlServerTest/UnitTest/Main.cs
index 1885db7c5..545951f3d 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()
         {
+            UnitManyToManyUpdate.Init();
             UnitManyToMay1231.Init();
             UnitUpdateNav2.Init();
             UnitUpdateNav.Init();
diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UnitManyToManyUpdate.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UnitManyToManyUpdate.cs
new file mode 100644
index 000000000..dec2c6b01
--- /dev/null
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UnitManyToManyUpdate.cs
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using SqlSugar;
+using static OrmTest.Program;
+namespace OrmTest
+{
+    public class UnitManyToManyUpdate
+    {
+        public static void Init()
+        {
+            var db = new SqlSugarScope(new SqlSugar.ConnectionConfig()
+            {
+                ConnectionString = Config.ConnectionString,
+                DbType = DbType.SqlServer,
+                IsAutoCloseConnection = true,
+            });
+            db.Aop.OnLogExecuting = (sql, pars) =>
+            {
+                 Console.WriteLine(sql);
+            };
+            //建表 
+            db.CodeFirst.InitTables<SchoolA111, SchoolAndRoomA111, RoomA111>();
+            db.DbMaintenance.TruncateTable<SchoolA111, SchoolAndRoomA111, RoomA111>();
+            //插入数据
+            db.Insertable(new SchoolA111 { SchoolId = 1, SchoolName = "清华" }).ExecuteCommand();
+            db.Insertable(new SchoolAndRoomA111 { SchoolId = 1, RoomId = 1, Weight = 1 }).ExecuteCommand();
+            db.Insertable(new SchoolAndRoomA111 { SchoolId = 1, RoomId = 2, Weight = 1 }).ExecuteCommand();
+            db.Insertable(new RoomA111 { RoomId = 1, RoomName = "甲号房" }).ExecuteCommand();
+            db.Insertable(new RoomA111 { RoomId = 2, RoomName = "乙号房" }).ExecuteCommand();
+            //用例代码
+            //查关系表数据
+            var data = db.Queryable<SchoolAndRoomA111>()
+                .Includes(it => it.School)
+                .Includes(it => it.Room)
+                .First();
+            //修改A表或B表数据
+            data.Room.RoomName = "丙号房";
+            //执行导航更新
+            //报错Sql (Update关系表中的AB表主键)：
+            //   UPDATE [SchoolAndRoomA]  SET [RoomId]=1  WHERE  SchoolId = 1
+            var result = db.UpdateNav(data)
+              .Include(it => it.School)
+              .Include(it => it.Room)
+                .ExecuteCommand();
+            Console.WriteLine(result);
+            Console.WriteLine("用例跑完");
+            Console.ReadKey();
+        }
+        //建类
+        public class SchoolA111
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int SchoolId { get; set; }
+            public string SchoolName { get; set; }
+        }
+        public class SchoolAndRoomA111
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int SchoolId { get; set; }
+            [SugarColumn(IsPrimaryKey = true)]
+            public int RoomId { get; set; }
+            public int? Weight { get; set; }
+            [SugarColumn(IsNullable = true)]
+            [Navigate(NavigateType.OneToOne, nameof(SchoolId))]
+            public SchoolA111 School { get; set; }
+            [SugarColumn(IsNullable = true)]
+            [Navigate(NavigateType.OneToOne, nameof(RoomId))]
+            public RoomA111 Room { get; set; }
+        }
+        public class RoomA111
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int RoomId { get; set; }
+            public string RoomName { get; set; }
+        }
+    }
+}
\ No newline at end of file