diff --git a/sample/getObjectUrl.php b/sample/getObjectUrl.php
new file mode 100644
index 00000000..0f43885c
--- /dev/null
+++ b/sample/getObjectUrl.php
@@ -0,0 +1,27 @@
+<?php
+
+require dirname(__FILE__) . '/../vendor/autoload.php';
+
+$secretId = "COS_SECRETID"; //"云 API 密钥 SecretId";
+$secretKey = "COS_SECRETKEY"; //"云 API 密钥 SecretKey";
+$region = "ap-beijing"; //设置一个默认的存储桶地域
+$cosClient = new Qcloud\Cos\Client(
+    array(
+        'region' => $region,
+        'schema' => 'https', //协议头部，默认为http
+        'credentials'=> array(
+            'secretId'  => $secretId ,
+            'secretKey' => $secretKey)));
+$local_path = "/data/exampleobject";
+
+try {    
+    $bucket = "examplebucket-1250000000"; //存储桶，格式：BucketName-APPID
+    $key = "exampleobject"; //对象在存储桶中的位置，即对象键
+    $signedUrl = $cosClient->getObjectUrl($bucket, $key, '+10 minutes'); //签名的有效时间
+    // 请求成功
+    echo $signedUrl;
+} catch (\Exception $e) {
+    // 请求失败
+    print_r($e);
+}
+
diff --git a/sample/getPresignetUrl.php b/sample/getPresignetUrl.php
new file mode 100644
index 00000000..6f0dea5d
--- /dev/null
+++ b/sample/getPresignetUrl.php
@@ -0,0 +1,29 @@
+<?php
+
+require dirname(__FILE__) . '/../vendor/autoload.php';
+
+$secretId = "COS_SECRETID"; //"云 API 密钥 SecretId";
+$secretKey = "COS_SECRETKEY"; //"云 API 密钥 SecretKey";
+$region = "ap-beijing"; //设置一个默认的存储桶地域
+$cosClient = new Qcloud\Cos\Client(
+    array(
+        'region' => $region,
+        'schema' => 'https', //协议头部，默认为http
+        'credentials'=> array(
+            'secretId'  => $secretId ,
+            'secretKey' => $secretKey)));
+$local_path = "/data/exampleobject";
+try {
+    $signedUrl = $cosClient->getPresignetUrl(
+                                $method='putObject',
+                                $args=['Bucket'=>'examplebucket-1250000000', //格式：BucketName-APPID
+                                       'Key'=>'exampleobject',
+                                       'Body'=>''],
+                                $expires='+30 minutes"');
+    // 请求成功
+    echo($signedUrl);
+} catch (\Exception $e) {
+    // 请求失败
+    echo($e);
+}
+
diff --git a/src/Qcloud/Cos/Tests/Test.php b/src/Qcloud/Cos/Tests/Test.php
index a954e669..c025e8be 100644
--- a/src/Qcloud/Cos/Tests/Test.php
+++ b/src/Qcloud/Cos/Tests/Test.php
@@ -30,6 +30,19 @@ protected function setUp()
     protected function tearDown() {
     }
 
+    function generateRandomString($length = 10) { 
+        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
+        $randomString = ''; 
+        for ($i = 0; $i < $length; $i++) { 
+            $randomString .= $characters[rand(0, strlen($characters) - 1)]; 
+        } 
+        return $randomString; 
+    }
+
+    function generateRandomFile($size = 10, $filename = 'random-file') { 
+        exec("dd if=/dev/urandom of=". $filename. " bs=1 count=". (string)$size);
+    }
+    
     /**********************************
      * TestBucket
      **********************************/
@@ -917,7 +930,7 @@ public function testUploadSmallObject() {
      */
     public function testPutObjectEmpty() {
         try {
-            $this->cosClient->upload($this->bucket, '你好.txt', '123');
+            $this->cosClient->upload($this->bucket, '你好.txt', '');
         } catch (ServiceResponseException $e) {
             print $e;
             $this->assertFalse(TRUE);
@@ -986,7 +999,12 @@ public function testPutObjectMeta2K() {
      */
     public function testUploadComplexObject() {
         try {
-            $this->cosClient->upload($this->bucket, '→↓←→↖↗↙↘! \"#$%&\'()*+,-./0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~', 'Hello World');
+            $key = '→↓←→↖↗↙↘! \"#$%&\'()*+,-./0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~';
+            $this->cosClient->upload($this->bucket, $key, 'Hello World');
+            $this->cosClient->headObject(array(
+                'Bucket' => $this->bucket,
+                'Key' => $key
+            ));
         } catch (ServiceResponseException $e) {
             print $e;
             $this->assertFalse(TRUE);
@@ -999,10 +1017,16 @@ public function testUploadComplexObject() {
      */
     public function testUploadLargeObject() {
         try {
+            $key = '你好.txt';
+            $body = $this->generateRandomString(3*1024*1024+1023);
+            $md5 = base64_encode(md5($body, true));
             $this->cosClient->upload($bucket=$this->bucket,
-                                     $key='你好.txt',
-                                     $body=str_repeat('a', 3 * 1024 * 1024 + 1),
+                                     $key=$key,
+                                     $body=$body,
                                      $options=['PartSize'=>1024 * 1024 + 1]);
+            $rt = $this->cosClient->getObject(['Bucket'=>$this->bucket, 'Key'=>$key]);
+            $download_md5 = base64_encode(md5($rt['Body'], true));
+            $this->assertEquals($md5, $download_md5);
         } catch (ServiceResponseException $e) {
             print $e;
             $this->assertFalse(TRUE);
@@ -1154,16 +1178,24 @@ public function testCopySmallObject() {
      */
     public function testCopyLargeObject() {
         try{
+            $key = '你好.txt';
+            $dst_key = 'hi.txt';
+            $body = $this->generateRandomString(3*1024*1024+1023);
+            $md5 = base64_encode(md5($body, true));
             $this->cosClient->upload($bucket=$this->bucket,
-                                     $key='你好.txt',
-                                     $body=str_repeat('a', 3 * 1024 * 1024 + 1),
+                                     $key=$key,
+                                     $body=$body,
                                      $options=['PartSize'=>1024 * 1024 + 1]);
             $this->cosClient->copy($bucket=$this->bucket,
-                                   $key='hi.txt', 
+                                   $key=$dst_key, 
                                    $copySource = ['Bucket'=>$this->bucket,
                                                   'Region'=>$this->region,
-                                                  'Key'=>'你好.txt'],
+                                                  'Key'=>$key],
                                    $options=['PartSize'=>1024 * 1024 + 1]);
+            
+            $rt = $this->cosClient->getObject(['Bucket'=>$this->bucket, 'Key'=>$dst_key]);
+            $download_md5 = base64_encode(md5($rt['Body'], true));
+            $this->assertEquals($md5, $download_md5);
         } catch (ServiceResponseException $e) {
             print $e;
             $this->assertFalse(TRUE);