diff --git a/Storage/Storage.Test/SubClassTest.cs b/Storage/Storage.Test/SubClassTest.cs
index 3419e49..a98c05f 100644
--- a/Storage/Storage.Test/SubClassTest.cs
+++ b/Storage/Storage.Test/SubClassTest.cs
@@ -1,49 +1,100 @@
 using NUnit.Framework;
-using LeanCloud;
 using System.Threading.Tasks;
 using System.Collections.Generic;
+using LeanCloud.Storage;
 
 namespace LeanCloud.Test {
-    [AVClassName("Account")]
-    public class Account : AVObject {
-        [AVFieldName("name")]
-        public string Name {
+    internal class Hello : LCObject {
+        internal World World => this["objectValue"] as World;
+
+        internal Hello() : base("Hello") { }
+    }
+
+    internal class World : LCObject {
+        internal string Content {
             get {
-                return GetProperty<string>("Name");
-            }
-            set {
-                SetProperty(value, "Name");
+                return this["content"] as string;
+            } set {
+                this["content"] = value;
             }
         }
 
-        [AVFieldName("balance")]
-        public int Balance {
+        internal World() : base("World") { }
+    }
+
+    internal class Account : LCObject {
+        internal int Balance {
             get {
-                return GetProperty<int>("Balance");
-            }
-            set {
-                SetProperty(value, "Balance");
+                return (int)this["balance"];
+            } set {
+                this["balance"] = value;
             }
         }
+
+        internal Account() : base("Account") { }
     }
 
     [TestFixture]
     public class SubClassTest {
         [SetUp]
         public void SetUp() {
-            Utils.InitNorthChina(true);
+            Logger.LogDelegate += Utils.Print;
+            LeanCloud.Initialize("ikGGdRE2YcVOemAaRbgp1xGJ-gzGzoHsz", "NUKmuRbdAhg1vrb2wexYo1jo", "https://ikggdre2.lc-cn-n1-shared.com");
+        }
+
+        [TearDown]
+        public void TearDown() {
+            Logger.LogDelegate -= Utils.Print;
         }
 
         [Test]
-        public async Task SubClass() {
-            AVObject.RegisterSubclass<Account>();
-            AVQuery<Account> query = new AVQuery<Account>();
-            IEnumerable<Account> accounts = await query.FindAsync();
-            foreach (Account account in accounts) {
-                Assert.NotNull(account.Name);
-                Assert.Greater(account.Balance, 0);
-                TestContext.Out.WriteLine($"{account.Name}, {account.Balance}");
+        public async Task Create() {
+            LCObject.RegisterSubclass<Account>("Account", () => new Account());
+            Account account = new Account();
+            account.Balance = 1000;
+            await account.Save();
+            TestContext.WriteLine(account.ObjectId);
+            Assert.NotNull(account.ObjectId);
+        }
+
+        [Test]
+        public async Task Query() {
+            LCObject.RegisterSubclass<Account>("Account", () => new Account());
+            LCQuery<Account> query = new LCQuery<Account>("Account");
+            query.WhereGreaterThan("balance", 500);
+            List<Account> list = await query.Find();
+            TestContext.WriteLine(list.Count);
+            Assert.Greater(list.Count, 0);
+            foreach (Account account in list) {
+                Assert.NotNull(account.ObjectId);
             }
         }
+
+        [Test]
+        public async Task Delete() {
+            LCObject.RegisterSubclass<Account>("Account", () => new Account());
+            Account account = new Account() {
+                Balance = 1024
+            };
+            await account.Save();
+            await account.Delete();
+        }
+
+        [Test]
+        public async Task Include() {
+            LCObject.RegisterSubclass<Hello>("Hello", () => new Hello());
+            LCObject.RegisterSubclass<World>("World", () => new World());
+
+            LCQuery<Hello> helloQuery = new LCQuery<Hello>("Hello");
+            helloQuery.Include("objectValue");
+            Hello hello = await helloQuery.Get("5e0d55aedd3c13006a53cd87");
+            World world = hello.World;
+
+            TestContext.WriteLine(hello.ObjectId);
+            Assert.AreEqual(hello.ObjectId, "5e0d55aedd3c13006a53cd87");
+            TestContext.WriteLine(world.ObjectId);
+            Assert.AreEqual(world.ObjectId, "5e0d55ae21460d006a1ec931");
+            Assert.AreEqual(world.Content, "7788");
+        }
     }
 }
diff --git a/Storage/Storage/Internal/Query/LCCompositionalCondition.cs b/Storage/Storage/Internal/Query/LCCompositionalCondition.cs
index ad5f39c..79af22d 100644
--- a/Storage/Storage/Internal/Query/LCCompositionalCondition.cs
+++ b/Storage/Storage/Internal/Query/LCCompositionalCondition.cs
@@ -171,8 +171,7 @@ namespace LeanCloud.Storage.Internal.Query {
                 { "limit", Limit }
             };
             if (conditionList != null && conditionList.Count > 0) {
-                // TODO json
-                dict["where"] = Encode();
+                dict["where"] = JsonConvert.SerializeObject(Encode());
             }
             if (orderByList != null && orderByList.Count > 0) {
                 dict["order"] = string.Join(",", orderByList);
diff --git a/Storage/Storage/LCObject.cs b/Storage/Storage/LCObject.cs
index 80593d6..d6c74c9 100644
--- a/Storage/Storage/LCObject.cs
+++ b/Storage/Storage/LCObject.cs
@@ -262,10 +262,11 @@ namespace LeanCloud.Storage {
             return this;
         }
 
-        public static void RegisterSubclass(string className, Type type, Func<LCObject> constructor) {
-            LCSubclassInfo subclassInfo = new LCSubclassInfo(className, type, constructor);
+        public static void RegisterSubclass<T>(string className, Func<LCObject> constructor) where T : LCObject {
+            Type classType = typeof(T);
+            LCSubclassInfo subclassInfo = new LCSubclassInfo(className, classType, constructor);
             subclassNameDict[className] = subclassInfo;
-            subclassTypeDict[type] = subclassInfo;
+            subclassTypeDict[classType] = subclassInfo;
         }
 
         void ApplyOperation(string key, ILCOperation op) {
diff --git a/Storage/Storage/LeanCloud.cs b/Storage/Storage/LeanCloud.cs
index a413456..ff218b7 100644
--- a/Storage/Storage/LeanCloud.cs
+++ b/Storage/Storage/LeanCloud.cs
@@ -29,9 +29,9 @@ namespace LeanCloud {
                 throw new ArgumentException(nameof(appKey));
             }
             // 注册 LeanCloud 内部子类化类型
-            LCObject.RegisterSubclass(LCUser.CLASS_NAME, typeof(LCUser), () => new LCUser());
-            LCObject.RegisterSubclass(LCRole.CLASS_NAME, typeof(LCRole), () => new LCRole());
-            LCObject.RegisterSubclass(LCFile.CLASS_NAME, typeof(LCFile), () => new LCFile());
+            LCObject.RegisterSubclass<LCUser>(LCUser.CLASS_NAME, () => new LCUser());
+            LCObject.RegisterSubclass<LCRole>(LCRole.CLASS_NAME, () => new LCRole());
+            LCObject.RegisterSubclass<LCFile>(LCFile.CLASS_NAME, () => new LCFile());
 
             HttpClient = new LCHttpClient(appId, appKey, server, SDKVersion, APIVersion);
         }