diff --git a/src/ClientFactory.php b/src/ClientFactory.php
index 8792bef..efb28ac 100644
--- a/src/ClientFactory.php
+++ b/src/ClientFactory.php
@@ -16,38 +16,9 @@
 use FriendsOfHyperf\Jet\Contract\PackerInterface;
 use FriendsOfHyperf\Jet\Contract\PathGeneratorInterface;
 use FriendsOfHyperf\Jet\Contract\TransporterInterface;
-use GuzzleHttp\ClientInterface;
 
 class ClientFactory
 {
-    /**
-     * User agent.
-     * @var string
-     */
-    protected static $userAgent;
-
-    /**
-     * Set user agent.
-     */
-    public static function setUserAgent(string $userAgent): void
-    {
-        self::$userAgent = $userAgent;
-    }
-
-    /**
-     * Get user agent.
-     */
-    public static function getUserAgent(): string
-    {
-        return self::$userAgent ?: sprintf(
-            'jet/%s php/%s guzzle/%s curl/%s',
-            Client::MAJOR_VERSION,
-            PHP_VERSION,
-            defined(ClientInterface::class . '::VERSION') ? constant(ClientInterface::class . '::VERSION') : constant(ClientInterface::class . '::MAJOR_VERSION'),
-            curl_version()['version']
-        );
-    }
-
     /**
      * Create a client.
      * @param null|int|string|TransporterInterface $transporter transporter, protocol, timeout or null
diff --git a/src/Support/UserAgent.php b/src/Support/UserAgent.php
new file mode 100644
index 0000000..8313c2d
--- /dev/null
+++ b/src/Support/UserAgent.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of jet.
+ *
+ * @link     https://github.com/friendsofhyperf/jet
+ * @document https://github.com/friendsofhyperf/jet/blob/main/README.md
+ * @contact  huangdijia@gmail.com
+ * @license  https://github.com/friendsofhyperf/jet/blob/main/LICENSE
+ */
+
+namespace FriendsOfHyperf\Jet\Support;
+
+use FriendsOfHyperf\Jet\Client;
+use GuzzleHttp\ClientInterface;
+
+class UserAgent
+{
+    /**
+     * @var null|string
+     */
+    protected static $value;
+
+    public static function set(string $value): void
+    {
+        self::$value = $value;
+    }
+
+    public static function get(): string
+    {
+        return self::$value ?: sprintf(
+            'jet/%s php/%s guzzle/%s curl/%s',
+            Client::MAJOR_VERSION,
+            PHP_VERSION,
+            defined(ClientInterface::class . '::VERSION') ? constant(ClientInterface::class . '::VERSION') : constant(ClientInterface::class . '::MAJOR_VERSION'),
+            curl_version()['version']
+        );
+    }
+}
diff --git a/src/Transporter/GuzzleHttpTransporter.php b/src/Transporter/GuzzleHttpTransporter.php
index 14bf63e..deb0503 100644
--- a/src/Transporter/GuzzleHttpTransporter.php
+++ b/src/Transporter/GuzzleHttpTransporter.php
@@ -12,7 +12,7 @@
 
 namespace FriendsOfHyperf\Jet\Transporter;
 
-use FriendsOfHyperf\Jet\ClientFactory;
+use FriendsOfHyperf\Jet\Support\UserAgent;
 use GuzzleHttp\Client;
 use GuzzleHttp\HandlerStack;
 use GuzzleHttp\RequestOptions;
@@ -43,7 +43,7 @@ public function __construct(string $host = '', int $port = 9501, array $config =
                 'Content-Type' => 'application/json',
                 'X-Real-Ip' => $_SERVER['SERVER_ADDR'] ?? '',
                 'X-Forwarded-For' => $_SERVER['REMOTE_ADDR'] ?? '',
-                'User-Agent' => ClientFactory::getUserAgent(),
+                'User-Agent' => UserAgent::get(),
             ],
             'http_errors' => false,
         ]);