diff --git a/src/OnPacketInterface.php b/src/OnPacketInterface.php
new file mode 100644
index 0000000..3cef995
--- /dev/null
+++ b/src/OnPacketInterface.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * This file is part of Hyperf.
+ *
+ * @link     https://www.hyperf.io
+ * @document https://hyperf.wiki
+ * @contact  group@hyperf.io
+ * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
+ */
+namespace Hyperf\Contract;
+
+use Swoole\WebSocket\Server;
+
+interface OnPacketInterface
+{
+    /**
+     * @param Server $server
+     * @param mixed $data
+     * @param array $clientInfo
+     */
+    public function onPacket($server, $data, $clientInfo): void;
+}