diff --git a/backend/kms-check.php b/backend/kms-check.php
index cbcad30..0d171ac 100644
--- a/backend/kms-check.php
+++ b/backend/kms-check.php
@@ -1,39 +1,38 @@
 <?php
 
-// TODO: site/app
-
 function checkKms($config) { // 检测KMS服务器是否可用
+    $tempPath = '/var/www/kms-server/backend/';
     if (isset($config['host'])) {
         $host = $config['host'];
-    } else {
-        return json_encode(array(
+    } else { // host参数必选
+        return array(
             'status' => 'error',
             'message' => 'host param not exist'
-        ));
+        );
     }
     if (isset($config['port'])) {
         $port = $config['port'];
     } else {
-        $port = 1688;
+        $port = 1688; // 默认KMS端口
     }
-    if (isset($config['version'])) {
-        $version = $config['version'];
+    if (isset($config['site']) && $config['site'] !== '') {
+        $site = $config['site'];
     } else {
-        $version = 6;
+        $site = null; // site参数可选
     }
 
     $cmd = 'vlmcs ';
     if (isDomain($host) || isIPv4($host)) {
         $cmd .= $host;
     } else if (isIPv6($host)) {
-        $cmd .= '[' . $host . ']';
+        $cmd .= '[' . $host . ']'; // IPv6地址需用中括号包围
     } else {
-        return array(
+        return array( // host内容不是 IPv4/IPv6/Domain
             'status' => 'error',
             'message' => 'illegal host'
         );
     }
-    if ($port > 65535 || $port < 0) {
+    if ($port > 65535 || $port < 0) { // 端口不存在
         return array(
             'status' => 'error',
             'message' => 'illegal port'
@@ -41,24 +40,22 @@ function checkKms($config) { // 检测KMS服务器是否可用
     } else {
         $cmd .= ':' . $port;
     }
-    if ($version != 4 && $version != 5 && $version != 6) {
-        return array(
-            'status' => 'error',
-            'message' => 'illegal version'
-        );
-    } else {
-        $cmd .= ' -' . $version;
+    if ($site !== null) {
+        $cmd .= ' -w ' . $site; // 加入site参数
     }
-
-    $raw = shell_exec($cmd);
-    preg_match('/successful/', $raw, $match);
+    $fileName = md5(rand()) . '.txt'; // 生成随机文件名
+    $cmd .= ' -G ' . $tempPath . $fileName;
+    shell_exec($cmd); // 执行vlmcs测试
+    $raw = shell_exec('ls ' . $tempPath);
+    preg_match('/' . $fileName . '/', $raw, $match); // 判断随机文件是否存在
     header('Content-Type: application/json; charset=utf-8');
-    if (!count($match)) {
+    if (!count($match)) { // 随机文件不存在 -> KMS连接错误
         return array(
             'status' => 'error',
             'message' => 'connect fail'
         );
-    } else {
+    } else { // 随机文件存在 -> KMS测试成功
+        shell_exec('rm -f ' . $tempPath . $fileName); // 删除随机文件
         return array(
             'status' => 'ok',
             'message' => 'success'
diff --git a/conf/docker/vlmcsd.sh b/conf/docker/vlmcsd.sh
index 665ba68..afde0cd 100644
--- a/conf/docker/vlmcsd.sh
+++ b/conf/docker/vlmcsd.sh
@@ -3,6 +3,7 @@ git clone --branch master --single-branch https://github.com/Wind4/vlmcsd.git /t
 cd /tmp/vlmcsd-build
 make
 mkdir /tmp/vlmcsd
+cp /tmp/vlmcsd-build/bin/vlmcs /tmp/vlmcsd/
 cp /tmp/vlmcsd-build/bin/vlmcsd /tmp/vlmcsd/
 cp /tmp/vlmcsd-build/etc/vlmcsd.kmd /tmp/vlmcsd/
-rm -rf /tmp/vlmcsd-build
+rm -rf /tmp/vlmcsd-build
\ No newline at end of file