diff --git a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
index b7c7dad14..da770526e 100644
--- a/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
+++ b/Src/Asp.Net/SqlServerTest/UnitTest/UCustom012.cs
@@ -63,36 +63,46 @@ namespace OrmTest
 
                 sch.TeacherList = db.Queryable<TeacherA>().SetContext(teachera => teachera.SchoolId, () => sch.SchoolId, sch).ToList();
             });
+     
 
             var list2=db.Queryable<StudentA>()
                 .Includes(x => x.SchoolA, x => x.RoomList)//2个参数就是 then Include 
                 .Includes(x => x.Books) 
                 .ToList();
-
-           var list3= db.Queryable<A>().Includes(x => x.BList).ToList();
+            db.CodeFirst.InitTables<A1, B1, ABMapping1>();
+            db.DbMaintenance.TruncateTable<A1>();
+            db.DbMaintenance.TruncateTable<B1>();
+            db.DbMaintenance.TruncateTable<ABMapping1>();
+            db.Insertable(new A1() { Id = 1, Name = "a1" }).ExecuteCommand();
+            db.Insertable(new A1() { Id = 2, Name = "a2" }).ExecuteCommand();
+            db.Insertable(new B1() { Id = 1, Name = "b1" }).ExecuteCommand();
+            db.Insertable(new B1() { Id = 2, Name = "b2" }).ExecuteCommand();
+            db.Insertable(new ABMapping1() {  AId=1,BId=1 }).ExecuteCommand();
+            db.Insertable(new ABMapping1() { AId = 2, BId = 2 }).ExecuteCommand();
+            var list3= db.Queryable<A1>().Includes(x => x.BList).ToList();
         }
 
-        public class ABMapping
+        public class ABMapping1
         {
-            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            [SugarColumn(IsPrimaryKey = true )]
             public int AId { get; set; }
             public int BId { get; set; }
         }
-        public class A
+        public class A1
         {
-            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            [SugarColumn(IsPrimaryKey = true  )]
             public int Id { get; set; }
             public string Name { get; set; }
-            [Navigat(typeof(ABMapping),nameof(ABMapping.AId),nameof(ABMapping.BId))]
-            public List<B> BList { get; set; }
+            [Navigat(typeof(ABMapping1),nameof(ABMapping1.AId),nameof(ABMapping1.BId))]
+            public List<B1> BList { get; set; }
         }
-        public class B
+        public class B1
         {
-            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            [SugarColumn(IsPrimaryKey = true )]
             public int Id { get; set; }
             public string Name { get; set; }
-            [Navigat(typeof(ABMapping), nameof(ABMapping.BId), nameof(ABMapping.AId))]
-            public List<A> BList { get; set; }
+            [Navigat(typeof(ABMapping1), nameof(ABMapping1.BId), nameof(ABMapping1.AId))]
+            public List<A1> BList { get; set; }
         }
 
         public class StudentA
@@ -112,7 +122,7 @@ namespace OrmTest
             [SugarColumn(IsPrimaryKey = true)]
             public int SchoolId { get; set; }
             public string SchoolName { get; set; }
-            [SugarColumn(IsIgnore = true)]
+            [Navigat(NavigatType.OneToMany,nameof(RoomA.SchoolId))]
             public List<RoomA> RoomList { get; set; }
             [SugarColumn(IsIgnore = true)]
             public List<TeacherA> TeacherList { get; set; }
diff --git a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
index a22c56d43..ca84d4522 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/NavigatManager.cs
@@ -23,7 +23,7 @@ namespace SqlSugar
         public List<T> RootList { get; set; }
         //public QueryableProvider<T> Queryable { get; set; }
 
-        //private List<Expression> _preExpressionList = new List<Expression>();
+        private List<Expression> _preExpressionList = new List<Expression>();
         //private Expression[] _expressions;
         //private List<T> _list;
         //private EntityInfo _entityInfo;
@@ -39,10 +39,19 @@ namespace SqlSugar
 
         private void ExecuteByLay(int i, Expression item)
         {
+ 
             if (i == 1)
             {
                 ExecuteByLay(item, RootList.Select(it => it as object).ToList(), SelectR1);
             }
+            else if(i == 2)
+            {
+                var memberExpression = ((_preExpressionList.Last() as LambdaExpression).Body as MemberExpression);
+                var navObjectName = memberExpression.Member.Name;
+                var list = RootList.Select(it =>(it.GetType().GetProperty(navObjectName).GetValue(it))).ToList();
+                ExecuteByLay(item, list, SelectR2);
+            }
+            _preExpressionList.Add(item);
         }
 
         private void ExecuteByLay(Expression expression, List<object> list, Func<ISugarQueryable<object>, List<object>> selector)
@@ -73,10 +82,45 @@ namespace SqlSugar
             }
             else
             {
-
+                ManyToMany(list, selector, listItemEntity, navObjectNamePropety, navObjectNameColumnInfo);
             }
         }
 
+        private void ManyToMany(List<object> list, Func<ISugarQueryable<object>, List<object>> selector, EntityInfo listItemEntity, System.Reflection.PropertyInfo navObjectNamePropety, EntityColumnInfo navObjectNameColumnInfo)
+        {
+            //var navEntity = navObjectNameColumnInfo.PropertyInfo.PropertyType.GetGenericArguments()[0];
+            //var navEntityInfo = this.Context.EntityMaintenance.GetEntityInfo(navEntity);
+            //var navColumn = navEntityInfo.Columns.FirstOrDefault(it => it.PropertyName == navObjectNameColumnInfo.Navigat.Name);
+            ////var navType = navObjectNamePropety.PropertyType;
+            //var listItemPkColumn = listItemEntity.Columns.Where(it => it.IsPrimarykey).FirstOrDefault();
+
+            //var ids = list.Select(it => it.GetType().GetProperty(listItemPkColumn.PropertyName).GetValue(it)).Select(it => it == null ? "null" : it).Distinct().ToList();
+            //List<IConditionalModel> conditionalModels = new List<IConditionalModel>();
+            //conditionalModels.Add((new ConditionalModel()
+            //{
+            //    ConditionalType = ConditionalType.In,
+            //    FieldName = navObjectNameColumnInfo.Navigat.Name,
+            //    FieldValue = String.Join(",", ids),
+            //    CSharpTypeName = listItemPkColumn.PropertyInfo.PropertyType.Name
+            //}));
+            //var navList = selector(this.Context.Queryable<object>().AS(navEntityInfo.DbTableName).Where(conditionalModels));
+            //if (navList.HasValue())
+            //{
+            //    foreach (var item in list)
+            //    {
+            //        var setValue = navList
+            //             .Where(x => navColumn.PropertyInfo.GetValue(x).ObjToString() == listItemPkColumn.PropertyInfo.GetValue(item).ObjToString()).ToList();
+            //        var instance = Activator.CreateInstance(navObjectNamePropety.PropertyType, true);
+            //        var ilist = instance as IList;
+            //        foreach (var value in setValue)
+            //        {
+            //            ilist.Add(value);
+            //        }
+            //        navObjectNamePropety.SetValue(item, instance);
+            //    }
+            //}
+        }
+
         private void OneToOne(List<object> list, Func<ISugarQueryable<object>, List<object>> selector, EntityInfo listItemEntity, System.Reflection.PropertyInfo navObjectNamePropety, EntityColumnInfo navObjectNameColumnInfo)
         {
             var navColumn = listItemEntity.Columns.FirstOrDefault(it => it.PropertyName == navObjectNameColumnInfo.Navigat.Name);
@@ -120,7 +164,7 @@ namespace SqlSugar
             }));
             var navList = selector(this.Context.Queryable<object>().AS(navEntityInfo.DbTableName).Where(conditionalModels));
             if (navList.HasValue())
-
+            {
                 foreach (var item in list)
                 {
                     var setValue = navList
@@ -131,17 +175,9 @@ namespace SqlSugar
                     {
                         ilist.Add(value);
                     }
-                    navObjectNamePropety.SetValue(item, instance); 
+                    navObjectNamePropety.SetValue(item, instance);
                 }
+            }
         }
-
-        //private void Lay2(List<Expression> preExpressionList, List<T> list)
-        //{
-
-        //}
-        //private void Lay3(List<Expression> preExpressionList, List<T> list)
-        //{
-
-        //}
     }
 }