diff --git a/src/EasySms.php b/src/EasySms.php
index 6430111b334fbc22e754a2e10338c2b398fab5d0..efd0fac6c5ffddc32fb8ccf4ef4d7741dc94e891 100644
--- a/src/EasySms.php
+++ b/src/EasySms.php
@@ -76,6 +76,9 @@ class EasySms
      * @param array                                              $gateways
      *
      * @return array
+     *
+     * @throws \Overtrue\EasySms\Exceptions\InvalidArgumentException
+     * @throws \Overtrue\EasySms\Exceptions\NoGatewayAvailableException
      */
     public function send($to, $message, array $gateways = [])
     {
@@ -88,6 +91,8 @@ class EasySms
      * @param string|null $name
      *
      * @return \Overtrue\EasySms\Contracts\GatewayInterface
+     *
+     * @throws \Overtrue\EasySms\Exceptions\InvalidArgumentException
      */
     public function gateway($name = null)
     {
@@ -158,7 +163,7 @@ class EasySms
      *
      * @return string
      *
-     * @throws if no default gateway configured
+     * @throws \RuntimeException if no default gateway configured
      */
     public function getDefaultGateway()
     {
@@ -199,6 +204,8 @@ class EasySms
      * @throws \InvalidArgumentException
      *
      * @return GatewayInterface
+     *
+     * @throws \Overtrue\EasySms\Exceptions\InvalidArgumentException
      */
     protected function createGateway($name)
     {
@@ -223,6 +230,8 @@ class EasySms
      * @param array  $config
      *
      * @return \Overtrue\EasySms\Contracts\GatewayInterface
+     *
+     * @throws \Overtrue\EasySms\Exceptions\InvalidArgumentException
      */
     protected function makeGateway($gateway, $config)
     {
diff --git a/src/Gateways/QcloudGateway.php b/src/Gateways/QcloudGateway.php
index 519f3fcebe39b0a76008eb0c9d55451c38581be0..8f13ae37ad2b736a3d17b6ddfdc846810f99c49b 100644
--- a/src/Gateways/QcloudGateway.php
+++ b/src/Gateways/QcloudGateway.php
@@ -66,7 +66,7 @@ class QcloudGateway extends Gateway
             'ext' => '',
         ];
 
-        $random = str_random(10);
+        $random = substr(uniqid(), -10);
 
         $params['sig'] = $this->generateSign($params, $random);
 
diff --git a/src/Gateways/TwilioGateway.php b/src/Gateways/TwilioGateway.php
index 2c83e423f61853bf588d115d64806a359981b2c4..98e245b4bc77b919ac79f41484898d3377fe4a96 100644
--- a/src/Gateways/TwilioGateway.php
+++ b/src/Gateways/TwilioGateway.php
@@ -11,11 +11,11 @@
 
 namespace Overtrue\EasySms\Gateways;
 
+use GuzzleHttp\Exception\ClientException;
 use Overtrue\EasySms\Contracts\MessageInterface;
 use Overtrue\EasySms\Exceptions\GatewayErrorException;
 use Overtrue\EasySms\Support\Config;
 use Overtrue\EasySms\Traits\HasHttpRequest;
-use GuzzleHttp\Exception\ClientException;
 
 /**
  * Class TwilioGateway.
diff --git a/tests/Gateways/QcloudGatewayTest.php b/tests/Gateways/QcloudGatewayTest.php
index e4b484a596594df96fb9e293084a2d111bfc6629..ddde9ffffe409547362e831ca7c349de25d30831 100644
--- a/tests/Gateways/QcloudGatewayTest.php
+++ b/tests/Gateways/QcloudGatewayTest.php
@@ -21,7 +21,7 @@ class QcloudGatewayTest extends TestCase
 {
     public function testGetName()
     {
-        $this->assertSame('tencent', (new QcloudGateway([]))->getName());
+        $this->assertSame('qcloud', (new QcloudGateway([]))->getName());
     }
 
     public function testSend()