diff --git a/Src/Asp.Net/SqlServerTest/Demo/Demo3_Insertable.cs b/Src/Asp.Net/SqlServerTest/Demo/Demo3_Insertable.cs
index 425002f5b..da3938b36 100644
--- a/Src/Asp.Net/SqlServerTest/Demo/Demo3_Insertable.cs
+++ b/Src/Asp.Net/SqlServerTest/Demo/Demo3_Insertable.cs
@@ -89,7 +89,7 @@ namespace OrmTest
             })
             .AddSubList(it => it.Items.First().OrderId).ExecuteReturnPrimaryKey();
 
-    
+
 
             db.Insertable(new List<RootTable0>() {
                 new RootTable0()
@@ -133,8 +133,8 @@ namespace OrmTest
            .AddSubList(it => it.TwoItem.RootId)
            .AddSubList(it => new SubInsertTree()
            {
-                  Expression = it.TwoItem2.RootId,
-                  ChildExpression=new List<SubInsertTree>() {
+               Expression = it.TwoItem2.RootId,
+               ChildExpression = new List<SubInsertTree>() {
                        new SubInsertTree(){
                             Expression=it.TwoItem2.ThreeItem2.First().TwoItem2Id
                        }
@@ -143,7 +143,14 @@ namespace OrmTest
            .AddSubList(it => it.TwoItem3)
            .ExecuteReturnPrimaryKey();
 
+            SubNoIdentity(db);
+            SubIdentity(db);
+            Console.WriteLine("#### Insertable End ####");
 
+        }
+
+        private static void SubNoIdentity(SqlSugarClient db)
+        {
             db.CodeFirst.InitTables<Country, Province, City>();
             db.DbMaintenance.TruncateTable("Country");
             db.DbMaintenance.TruncateTable("Province");
@@ -211,18 +218,96 @@ namespace OrmTest
             })
             .ExecuteReturnPrimaryKey();
 
-            var list= db.Queryable<Country>()
+            var list = db.Queryable<Country>()
                                  .Mapper(it => it.Provinces, it => it.Provinces.First().CountryId)
-                                 .Mapper(it=> {
+                                 .Mapper(it =>
+                                 {
                                      foreach (var item in it.Provinces)
                                      {
                                          item.citys = db.Queryable<City>().Where(y => y.ProvinceId == item.Id).ToList();
                                      }
-                                 }) 
+                                 })
                                  .ToList();
+        }
+        private static void SubIdentity(SqlSugarClient db)
+        {
+            db.CodeFirst.InitTables<Country1, Province1, City1>();
+            db.DbMaintenance.TruncateTable("Country1");
+            db.DbMaintenance.TruncateTable("Province1");
+            db.DbMaintenance.TruncateTable("City1");
+            db.Insertable(new List<Country1>()
+            {
+                 new Country1(){
+                     Id=1,
+                      Name="中国",
+                       Provinces=new List<Province1>(){
+                            new Province1{
+                                 Id=1001,
+                                 Name="江苏",
+                                  citys=new List<City1>(){
+                                       new City1(){ Id=1001001, Name="南通" },
+                                       new City1(){ Id=1001002, Name="南京" }
+                                  }
+                            },
+                           new Province1{
+                                 Id=1002,
+                                 Name="上海",
+                                  citys=new List<City1>(){
+                                       new City1(){ Id=1002001, Name="徐汇" },
+                                       new City1(){ Id=1002002, Name="普陀" }
+                                  }
+                            },
+                           new Province1{
+                                 Id=1003,
+                                 Name="北京",
+                                 citys=new List<City1>(){
+                                       new City1(){ Id=1003001, Name="北京A" },
+                                       new City1(){ Id=1003002, Name="北京B" }
+                                  }
+                            }
+                       }
+                 },
+                 new Country1(){
+                      Name="美国",
+                      Id=2,
+                      Provinces=new List<Province1>()
+                      {
+                          new Province1(){
+                               Name="美国小A",
+                               Id=20001
+                          },
+                         new Province1(){
+                               Name="美国小b",
+                               Id=20002
+                          }
+                      }
+                  },
+                 new Country1(){
+                      Name="英国",
+                      Id=3
+                  }
+            })
+            .AddSubList(it => new SubInsertTree()
+            {
+                Expression = it.Provinces.First().CountryId,
+                ChildExpression = new List<SubInsertTree>() {
+                      new SubInsertTree(){
+                           Expression=it.Provinces.First().citys.First().ProvinceId
+                      }
+                 }
+            })
+            .ExecuteReturnPrimaryKey();
 
-            Console.WriteLine("#### Insertable End ####");
-
+            var list = db.Queryable<Country1>()
+                                 .Mapper(it => it.Provinces, it => it.Provinces.First().CountryId)
+                                 .Mapper(it =>
+                                 {
+                                     foreach (var item in it.Provinces)
+                                     {
+                                         item.citys = db.Queryable<City1>().Where(y => y.ProvinceId == item.Id).ToList();
+                                     }
+                                 })
+                                 .ToList();
         }
     }
 }
diff --git a/Src/Asp.Net/SqlServerTest/Models/SubInsertTest.cs b/Src/Asp.Net/SqlServerTest/Models/SubInsertTest.cs
index f30a90754..702f93a93 100644
--- a/Src/Asp.Net/SqlServerTest/Models/SubInsertTest.cs
+++ b/Src/Asp.Net/SqlServerTest/Models/SubInsertTest.cs
@@ -76,4 +76,33 @@ namespace OrmTest
         public int ProvinceId { get; set; }
         public string Name { get; set; }
     }
+
+
+    public class Country1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<Province1> Provinces { get; set; }
+    }
+
+    public class Province1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public int CountryId { get; set; }
+        [SqlSugar.SugarColumn(IsIgnore = true)]
+        public List<City1> citys { get; set; }
+    }
+
+    public class City1
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true,IsIdentity =true)]
+        public int Id { get; set; }
+        public int ProvinceId { get; set; }
+        public string Name { get; set; }
+    }
 }
diff --git a/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs b/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
index d74e13baa..9b869d69d 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/SubInserable.cs
@@ -267,6 +267,7 @@ namespace SqlSugar
             if (id.ObjToInt() == 0)
             {
                 var primaryProperty = entityInfo.Columns.FirstOrDefault(it => it.IsPrimarykey);
+                Check.Exception(primaryProperty == null, entityInfo.EntityName + " no primarykey");
                 pkValue = primaryProperty.PropertyInfo.GetValue(InsertObject);
             }
             else