diff --git a/Contract/OnMessageInterface.php b/Contract/OnMessageInterface.php
new file mode 100644
index 0000000..5e5a98e
--- /dev/null
+++ b/Contract/OnMessageInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Kiri\Server\Contract;
+
+use Swoole\Server;
+use Swoole\WebSocket\Frame;
+
+interface OnMessageInterface
+{
+
+
+	/**
+	 * @param Server $server
+	 * @param Frame $frame
+	 * @return void
+	 */
+	public function onMessage(Server $server, Frame $frame): void;
+
+}