diff --git a/src/Qcloud/Cos/Client.php b/src/Qcloud/Cos/Client.php
index 4bdc6459..70676ca9 100644
--- a/src/Qcloud/Cos/Client.php
+++ b/src/Qcloud/Cos/Client.php
@@ -44,6 +44,7 @@ public function __construct($cosConfig) {
         $this->cosConfig['ip'] = isset($cosConfig['ip']) ? $cosConfig['ip'] : null;
         $this->cosConfig['port'] = isset($cosConfig['port']) ? $cosConfig['port'] : null;
         $this->cosConfig['endpoint'] = isset($cosConfig['endpoint']) ? $cosConfig['endpoint'] : 'myqcloud.com';
+        $this->cosConfig['domain'] = isset($cosConfig['domain']) ? $cosConfig['domain'] : null;
         $this->cosConfig['proxy'] = isset($cosConfig['proxy']) ? $cosConfig['proxy'] : null;
         $this->cosConfig['userAgent'] = isset($cosConfig['userAgent']) ? $cosConfig['userAgent'] : 'cos-php-sdk-v5.'. Client::VERSION;
         $this->cosConfig['pathStyle'] = isset($cosConfig['pathStyle']) ? $cosConfig['pathStyle'] : false;
@@ -161,7 +162,7 @@ public function getPresignetUrl($method, $args, $expires = null) {
     public function getObjectUrl($bucket, $key, $expires = null, array $args = array()) {
         $command = $this->getCommand('GetObject', $args + array('Bucket' => $bucket, 'Key' => $key));
         $request = $this->commandToRequestTransformer($command);
-        return $this->createPresignedUrl($request, $expires);
+        return $this->createPresignedUrl($request, $expires)->__toString();
     }
 
     public function upload($bucket, $key, $body, $options = array()) {
diff --git a/src/Qcloud/Cos/CosTransformer.php b/src/Qcloud/Cos/CosTransformer.php
index ae0272d2..19b5d7d4 100644
--- a/src/Qcloud/Cos/CosTransformer.php
+++ b/src/Qcloud/Cos/CosTransformer.php
@@ -57,6 +57,10 @@ public function bucketStyleTransformer(CommandInterface $command, RequestInterfa
             }
         }
         $origin_host = $bucketname. '.cos.' . $this->config['region'] . '.' . $this->config['endpoint'];
+        // domain
+        if ($this->config['domain'] != null) {
+            origin_host = $this->config['domain']
+        }
         $host = $origin_host;
         if ($this->config['ip'] != null) {
             $host = $this->config['ip'];
diff --git a/src/Qcloud/Cos/Service.php b/src/Qcloud/Cos/Service.php
index e1e7e17d..69adbf4e 100644
--- a/src/Qcloud/Cos/Service.php
+++ b/src/Qcloud/Cos/Service.php
@@ -747,6 +747,11 @@ public static function getService() {
                             'location' => 'header',
                             'sentAs' => 'x-cos-server-side-encryption-customer-key-MD5',
                         ),
+                        'TrafficLimit' => array(
+                            'type' => 'integer',
+                            'location' => 'header',
+                            'sentAs' => 'x-cos-traffic-limit',
+                        )
                     )
                 ),
                 // 获取 COS 对象的访问权限信息（Access Control List, ACL）的方法.
@@ -1063,6 +1068,11 @@ public static function getService() {
                             'type' => 'string',
                             'location' => 'header',
                             'sentAs' => 'x-cos-request-payer',
+                        ),
+                        'TrafficLimit' => array(
+                            'type' => 'integer',
+                            'location' => 'header',
+                            'sentAs' => 'x-cos-traffic-limit',
                         )
                     )
                 ),
@@ -1192,6 +1202,11 @@ public static function getService() {
                             'type' => 'string',
                             'location' => 'header',
                             'sentAs' => 'Pic-Operations',
+                        ),
+                        'TrafficLimit' => array(
+                            'type' => 'integer',
+                            'location' => 'header',
+                            'sentAs' => 'x-cos-traffic-limit',
                         )
                     )
                 ),
@@ -2625,7 +2640,153 @@ public static function getService() {
                             'sentAs' => 'x-cos-request-payer',
                         )
                     ),
-                )
+                ),
+                'SelectObjectContent' => array(
+                    'httpMethod' => 'Post',
+                    'uri' => '/{/Key*}?select&select-type=2',
+                    'class' => 'Qcloud\\Cos\\Command',
+                    'responseClass' => 'SelectObjectContentOutput',
+                    'responseType' => 'model',
+                    'data' => array(
+                        'xmlRoot' => array(
+                            'name' => 'SelectRequest',
+                        ),
+                        'contentMd5' => true,
+                    ),
+                    'parameters' => array(
+                        'Bucket' => array(
+                            'required' => true,
+                            'type' => 'string',
+                            'location' => 'uri',
+                        ),
+                        'Key' => array(
+                            'required' => true,
+                            'type' => 'string',
+                            'location' => 'uri',
+                            'minLength' => 1,
+                            'filters' => array(
+                                'Qcloud\\Cos\\Client::explodeKey')
+                        ),
+                        'Expression' => array(
+                            'type' => 'string',
+                            'location' => 'xml'
+                        ),
+                        'ExpressionType' => array(
+                            'type' => 'string',
+                            'location' => 'xml'
+                        ),
+                        'InputSerialization' => array(
+                            'location' => 'xml',
+                            'type' => 'object',
+                            'properties' => array(
+                                'CompressionType' => array(
+                                    'type' => 'string',
+                                    'location' => 'xml',
+                                ),
+                                'CSV' => array(
+                                    'type' => 'object',
+                                    'location' => 'xml',
+                                    'properties' => array(
+                                        'FileHeaderInfo' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'RecordDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'FieldDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'QuoteCharacter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'QuoteEscapeCharacter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'Comments' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'AllowQuotedRecordDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                    )
+                                ),
+                                'JSON' => array(
+                                    'type' => 'string',
+                                    'location' => 'object',
+                                    'properties' => array(
+                                        'Type' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        )
+                                    )
+                                ),
+                            )
+                        ),
+                        'OutputSerialization' => array(
+                            'location' => 'xml',
+                            'type' => 'object',
+                            'properties' => array(
+                                'CompressionType' => array(
+                                    'type' => 'string',
+                                    'location' => 'xml',
+                                ),
+                                'CSV' => array(
+                                    'type' => 'object',
+                                    'location' => 'xml',
+                                    'properties' => array(
+                                        'QuoteFields' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'RecordDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'FieldDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'QuoteCharacter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                        'QuoteEscapeCharacter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        ),
+                                    )
+                                ),
+                                'JSON' => array(
+                                    'type' => 'string',
+                                    'location' => 'object',
+                                    'properties' => array(
+                                        'RecordDelimiter' => array(
+                                            'type' => 'string',
+                                            'location' => 'xml',
+                                        )
+                                    )
+                                ),
+                            )
+                        ),
+                        'RequestProgress' => array(
+                            'location' => 'xml',
+                            'type' => 'object',
+                            'properties' => array(
+                                'Enabled' => array(
+                                    'type' => 'string',
+                                    'location' => 'xml',
+                                ),
+                            )
+                        ),
+                    ),
+                ),
             ),
             'models' => array(
                 'AbortMultipartUploadOutput' => array(
@@ -4661,6 +4822,18 @@ public static function getService() {
                         ),
                     ),
                 ),
+                
+                'SelectObjectContentOutput' => array(
+                    'type' => 'object',
+                    'additionalProperties' => true,
+                    'properties' => array(
+                        'Data' => array(
+                            'type' => 'string',
+                            'instanceOf' => 'GuzzleHttp\\Psr7\\Stream',
+                            'location' => 'body',
+                        ),
+                    ),
+                ),
             )
         );
     }