diff --git a/README.md b/README.md
index a06a428..d800872 100644
--- a/README.md
+++ b/README.md
@@ -1,18 +1,48 @@
+<!--
+ * @Description: 
+ * @Author: ekibun
+ * @Date: 2020-08-08 08:16:50
+ * @LastEditors: ekibun
+ * @LastEditTime: 2020-08-20 00:33:22
+-->
 # flutter_qjs
 
 A quickjs engine for flutter.
 
+## Feature
+
+This plugin is a simple js engine for flutter used `quickjs` project.
+
+Each `FlutterJs` object create a new thread that running a simple js loop. A global async function `dart` is presented to invoke dart function, and `Promise` is supported in evaluating js script so that you can use `await` or `then` to get external result from `dart`. 
+
+Data convertion between dart and js are implemented as follow:
+
+| dart | js |
+| --- | --- |
+| Bool | boolean |
+| Int | number |
+| Double | number |
+| String | string |
+| Uint8List/Int32List/Int64List | ArrayBuffer |
+| Float64List | number[] |
+| List | Array |
+| Map | Object |
+| Closure(List) => Future | function(....args) |
+
+**notice:**
+1. All the `Uint8List/Int32List/Int64List` sent from dart will be converted to `ArrayBuffer` without marked the size of elements, and the `ArrayBuffer` will be converted to `Uint8List`.
+
+2. `function` can only sent from js to dart and all the arguments will be packed in a dart `List` object.
+
 ## Getting Started
 
-This project is a starting point for a Flutter
-[plug-in package](https://flutter.dev/developing-packages/),
-a specialized package that includes platform-specific implementation code for
-Android and/or iOS.
+1. Creat a `FlutterJs` object. Makes sure call `close` to release memory when not need it.
 
-For help getting started with Flutter, view our
-[online documentation](https://flutter.dev/docs), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+2. Call `setMethodHandler` to maintain `dart` function.
 
-The plugin project was generated without specifying the `--platforms` flag, no platforms are currently supported.
-To add platforms, run `flutter create -t plugin --platforms <platforms> .` under the same
-directory. You can also find a detailed instruction on how to add platforms in the `pubspec.yaml` at https://flutter.dev/docs/development/packages-and-plugins/developing-packages#plugin-platforms.
+3. Use `evaluate` to evaluate js script. Makes sure surrounding try-cacth to capture evaluating error.
+
+[this](example/lib/test.dart) contains a fully use of this plugin. 
+
+**notice:**
+To use this plugin in Linux desktop application, you must change `cxx_std_14` to `cxx_std_17` in your project's `CMakeLists.txt`.
\ No newline at end of file
diff --git a/android/src/main/jni/java_js_wrapper.hpp b/android/src/main/jni/java_js_wrapper.hpp
index dcdf8a3..0628557 100644
--- a/android/src/main/jni/java_js_wrapper.hpp
+++ b/android/src/main/jni/java_js_wrapper.hpp
@@ -3,7 +3,7 @@
  * @Author: ekibun
  * @Date: 2020-08-16 11:08:23
  * @LastEditors: ekibun
- * @LastEditTime: 2020-08-19 00:40:54
+ * @LastEditTime: 2020-08-19 13:06:19
  */
 #include <string>
 #include <unordered_map>
@@ -55,14 +55,13 @@ namespace qjs
     }
     else if (className.compare("[D") == 0)
     {
-      jobjectArray list = jniToArray(env, val);
-      jsize size = env->GetArrayLength(list);
+      jsize size = env->GetArrayLength((jdoubleArray)val);
       JSValue array = JS_NewArray(ctx);
-      cache[val] = array;
+      auto buf = env->GetDoubleArrayElements((jdoubleArray)val, 0);
       for (uint32_t i = 0; i < size; i++)
         JS_DefinePropertyValue(
             ctx, array, JS_NewAtomUInt32(ctx, i),
-            javaToJs(ctx, env, env->GetObjectArrayElement(list, i), cache),
+            JS_NewFloat64(ctx, buf[i]),
             JS_PROP_C_W_E);
       return array;
     }
diff --git a/example/lib/test.dart b/example/lib/test.dart
index 20df8cf..5189d2f 100644
--- a/example/lib/test.dart
+++ b/example/lib/test.dart
@@ -3,8 +3,10 @@
  * @Author: ekibun
  * @Date: 2020-07-18 23:28:55
  * @LastEditors: ekibun
- * @LastEditTime: 2020-08-18 23:23:46
+ * @LastEditTime: 2020-08-19 13:26:52
  */
+import 'dart:typed_data';
+
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_qjs/flutter_qjs.dart';
@@ -51,6 +53,18 @@ class _TestPageState extends State<TestPage> {
                               return response.data;
                             case "hello":
                               return await arg[0](["hello: "]);
+                            case "test":
+                              return [
+                                true, 
+                                1, 
+                                0.5, 
+                                "str", 
+                                { "key": "val", 0: 1 }, 
+                                Uint8List(2), 
+                                Int32List(2), 
+                                Int64List(2), 
+                                Float64List(2), 
+                                Float32List(2)];
                             default:
                               return JsMethodHandlerNotImplement();
                           }