diff --git a/Src/Asp.Net/SqlServerTest/6_NavigationProperty.cs b/Src/Asp.Net/SqlServerTest/6_NavigationProperty.cs
new file mode 100644
index 000000000..06f8db20c
--- /dev/null
+++ b/Src/Asp.Net/SqlServerTest/6_NavigationProperty.cs
@@ -0,0 +1,164 @@
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    internal class _6_NavQuery
+    {
+        public static void Init()
+        {
+            var db = NewUnitTest.Db;
+
+            InitializeDatabase(db);
+
+            OneToOneTest(db);
+
+            OneToManyTest(db);
+
+            ManyToManyTest(db);
+        }
+        private static void ManyToManyTest(SqlSugarClient db)
+        {
+            var list4 = db.Queryable<A>().Includes(it => it.BList).ToList();
+
+            var list5 = db.Queryable<A>().Includes(it => it.BList.Where(s => s.BId == 1).ToList()).ToList();
+
+            var list6 = db.Queryable<A>().Includes(it => it.BList)
+                        .Where(it => it.BList.Any(s => s.BId == 1)).ToList();
+
+            var list7 = db.Queryable<A>()
+                      .Includes(it => it.BList.Where(s => s.BId == 1).ToList())
+                      .Where(it => it.BList.Any(s => s.BId == 1)).ToList();
+        }
+
+        private static void OneToManyTest(SqlSugarClient db)
+        {
+            var list4 = db.Queryable<Student>().Includes(it => it.Books).ToList();
+
+            var list5 = db.Queryable<Student>().Includes(it => it.Books.Where(s=>s.BookId==1).ToList()).ToList();
+
+            var list6 = db.Queryable<Student>().Includes(it => it.Books)
+                        .Where(it=>it.Books.Any(s=>s.BookId==1)).ToList();
+
+            var list7 = db.Queryable<Student>()
+                      .Includes(it => it.Books.Where(s => s.BookId == 1).ToList())
+                      .Where(it => it.Books.Any(s => s.BookId == 1)).ToList();
+        }
+
+        private static void OneToOneTest(SqlSugarClient db)
+        {
+            var list = db.Queryable<Student>()
+                .Where(it => it.School.SchoolId == 1)
+                .ToList();
+
+            var list2 = db.Queryable<Student>().IncludeInnerJoin(it => it.School)
+                .ToList();
+
+            var list3 = db.Queryable<Student>().Includes(it => it.School).ToList();
+        }
+
+        private static void InitializeDatabase(SqlSugarClient db)
+        {
+            db.CodeFirst.InitTables<Student, School, Book>();
+            db.DbMaintenance.TruncateTable<Student, School, Book>();
+            var students = new List<Student>
+                                {
+                                    new Student {
+                                        Name = "Student 1",
+                                        SexCode = "M",
+                                        School = new School { SchoolName = "School 1" },
+                                        Books = new List<Book> {
+                                            new Book { Name = "Book 1" },
+                                            new Book { Name = "Book 2" }
+                                        }
+                                    },
+                                new Student {
+                                    Name = "Student 2",
+                                    SexCode = "F",
+                                    School =  new School { SchoolName = "School 2" },
+                                    Books = new List<Book> {
+                                        new Book { Name = "Book 3" }
+                                    }
+                                }
+                               };
+
+            db.InsertNav(students)
+                .Include(it => it.School)
+                .Include(it => it.Books).ExecuteCommand();
+
+
+
+            db.CodeFirst.InitTables<A, B, ABMapping>();
+            db.DbMaintenance.TruncateTable<A, B, ABMapping>();
+            List<A> a1 = new List<A> { new A() { Name = "A1" }, new A() { Name = "A2" } };
+            B b1 = new B { Name = "B1" };
+            B b2 = new B { Name = "B2" };
+            a1[0].BList = new List<B> { b1,b2 };
+
+            db.InsertNav(a1).Include(x => x.BList).ExecuteCommand();
+        }
+         
+        [SugarTable("Student06")]
+        public class Student
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int StudentId { get; set; }
+            public string Name { get; set; }
+            public string SexCode { get; set; }
+            public int SchoolId { get; set; }
+
+            [Navigate(NavigateType.OneToOne, nameof(SchoolId))]
+            public School School { get; set; }
+
+            [Navigate(NavigateType.OneToMany, nameof(Book.StudentId))]
+            public List<Book> Books { get; set; }
+        }
+        [SugarTable("School06")]
+        public class School
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int SchoolId { get; set; }
+            public string SchoolName { get; set; }
+        }
+        [SugarTable("Book06")]
+        public class Book
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int BookId { get; set; }
+            public string Name { get; set; }
+            public int StudentId { get; set; }
+        }
+        [SugarTable("A06")]
+        public class A
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int AId { get; set; }
+            public string Name { get; set; }
+
+            [Navigate(typeof(ABMapping), nameof(ABMapping.AId), nameof(ABMapping.BId))]
+            public List<B> BList { get; set; }
+        }
+        [SugarTable("B06")]
+        public class B
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int BId { get; set; }
+            public string Name { get; set; }
+
+            [Navigate(typeof(ABMapping), nameof(ABMapping.BId), nameof(ABMapping.AId))]
+            public List<A> AList { get; set; }
+        }
+        [SugarTable("ABMapping06")]
+        public class ABMapping
+        {
+            [SugarColumn(IsPrimaryKey = true)]
+            public int AId { get; set; }
+            [SugarColumn(IsPrimaryKey = true)]
+            public int BId { get; set; }
+        }
+    }
+}
diff --git a/Src/Asp.Net/SqlServerTest/Program.cs b/Src/Asp.Net/SqlServerTest/Program.cs
index 2afb7e2af..aca17545d 100644
--- a/Src/Asp.Net/SqlServerTest/Program.cs
+++ b/Src/Asp.Net/SqlServerTest/Program.cs
@@ -13,7 +13,7 @@ namespace OrmTest
             _3_EasyQuery.Init();
             _4_JoinQuery.Init();
             _5_PageQuery.Init();
-            Console.ReadKey();
+            _6_NavQuery.Init(); 
         }
     }
 
diff --git a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
index 669f833f0..e8c74d55f 100644
--- a/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
+++ b/Src/Asp.Net/SqlServerTest/SqlServerTest.csproj
@@ -250,6 +250,7 @@
     <Compile Include="UserTestCases\Cases\UJson.cs" />
     <Compile Include="UserTestCases\Cases\Main.cs" />
     <Compile Include="UserTestCases\Cases\UThread.cs" />
+    <Compile Include="6_NavigationProperty.cs" />
     <Compile Include="UserTestCases\UserTestMain.cs" />
   </ItemGroup>
   <ItemGroup>