diff --git a/CHANGELOG.md b/CHANGELOG.md
old mode 100644
new mode 100755
index bdea685..e2ae903
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -75,3 +75,6 @@
 
 #2.1.18
 * 增加权限api请求接口
+
+#2.1.19
+* 增加Buy指令
diff --git a/src/Directive/Pay/Buy.php b/src/Directive/Pay/Buy.php
new file mode 100755
index 0000000..842d603
--- /dev/null
+++ b/src/Directive/Pay/Buy.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * Copyright (c) 2017 Baidu, Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * @desc 用于生成Buy指令的类
+ **/
+namespace Baidu\Duer\Botsdk\Directive\Pay;
+
+class Buy extends \Baidu\Duer\Botsdk\Directive\BaseDirective{
+
+    /**
+     * @param [type] $productId [description]
+     * @param [type] $token     [description]
+     */
+    public function __construct($productId, $token = '') {
+        parent::__construct('Connections.SendRequest.Buy');
+
+        if (empty($token)) {
+            $token = $this->genToken();
+        }
+
+        $this->data['token'] = $token;
+        $this->data['payload']['productId'] = $productId;
+    }
+}