diff --git a/.travis.yml b/.travis.yml
index 8798947..d81cf1d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,10 @@
 language: node_js
 node_js:
- - '4.2.2'
+ - 'v6.17.0'
 
 before_script:
   - npm install
-  
+
 script: "npm test"
 
 after_script: "npm install coveralls@2 && cat ./coverage/lcov.info | coveralls"
diff --git a/README.md b/README.md
index 920ebc3..202b68b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # yhsd-api-node
 
-友好速搭 API SDK for Node(v4.9.1)
+友好速搭 API SDK for Node(>= v6) 
 支持`Promise`依赖[bluebird](https://github.com/petkaantonov/bluebird)。
 
 
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..aae52f5
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,58 @@
+interface ApiOption {
+    host?: string;
+    protocol?: string;
+    getRequestCount?: (token: string) => any;
+    saveRequestCount?: (token: string) => void;
+}
+
+interface AuthOption {
+    appKey: string;
+    appSecret: string;
+    callbackUrl?: string;
+    redirectUrl?: string;
+    scope?: string[];
+    private?: boolean;
+}
+
+declare module 'yhsd-api' {
+    class Auth {
+        constructor(options: AuthOption);
+
+        // 验证 Hmac
+        verifyHmac(queryObj: object): boolean;
+
+        // 获取应用授权页面地址，用于开放应用
+        getAuthorizeUrl(shopKey: string, state: string): string;
+
+        // 获取 token
+        getToken(code?: string): Promise<string>;
+    }
+
+    class Api {
+
+        constructor(token: string, option?: ApiOption);
+
+        // 发送 GET 请求
+        get(path: string, query?: object): Promise<any>;
+
+        // 发送 PUT 请求
+        put(path: string, data?: object): Promise<any>;
+
+        // 发送 POST 请求
+        post(path: string, data?: object): Promise<any>;
+
+        // 发送 DELETE 请求
+        delete(path: string): Promise<any>;
+
+        // 请求函数
+        request(method: string, path: string, params?: object): Promise<any>
+    }
+
+    class WebHook {
+        constructor(webHookToken: string);
+
+        // 验证WebHook Hmac
+        verifyHmac(hmac: string, bodyData: string): boolean;
+    }
+}
+
diff --git a/lib/Auth.js b/lib/Auth.js
index 4bb112f..9e2e119 100644
--- a/lib/Auth.js
+++ b/lib/Auth.js
@@ -89,7 +89,7 @@ Auth.prototype = {
 
 
     if (this.private) {
-      headers.Authorization = 'Basic ' + new Buffer(this.app_key + ':' + this.app_secret).toString('base64');
+      headers.Authorization = 'Basic ' +  Buffer.from(this.app_key + ':' + this.app_secret).toString('base64');
       params = {
         grant_type: 'client_credentials'
       };
diff --git a/package.json b/package.json
index 112cd12..d9fe9ec 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "yhsd-api",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "Youhaosuda API SDK for node.",
   "main": "index.js",
   "repository": {
@@ -25,6 +25,9 @@
     "mocha": "^2.3.4",
     "should": "^8.0.2"
   },
+  "engines": {
+    "node": ">= 6.0.0"
+  },
   "dependencies": {
     "bluebird": "^3.5.1"
   }