diff --git a/backend/kms-check.php b/backend/kms-check.php
new file mode 100644
index 0000000..cbcad30
--- /dev/null
+++ b/backend/kms-check.php
@@ -0,0 +1,69 @@
+<?php
+
+// TODO: site/app
+
+function checkKms($config) { // 检测KMS服务器是否可用
+    if (isset($config['host'])) {
+        $host = $config['host'];
+    } else {
+        return json_encode(array(
+            'status' => 'error',
+            'message' => 'host param not exist'
+        ));
+    }
+    if (isset($config['port'])) {
+        $port = $config['port'];
+    } else {
+        $port = 1688;
+    }
+    if (isset($config['version'])) {
+        $version = $config['version'];
+    } else {
+        $version = 6;
+    }
+
+    $cmd = 'vlmcs ';
+    if (isDomain($host) || isIPv4($host)) {
+        $cmd .= $host;
+    } else if (isIPv6($host)) {
+        $cmd .= '[' . $host . ']';
+    } else {
+        return array(
+            'status' => 'error',
+            'message' => 'illegal host'
+        );
+    }
+    if ($port > 65535 || $port < 0) {
+        return array(
+            'status' => 'error',
+            'message' => 'illegal port'
+        );
+    } else {
+        $cmd .= ':' . $port;
+    }
+    if ($version != 4 && $version != 5 && $version != 6) {
+        return array(
+            'status' => 'error',
+            'message' => 'illegal version'
+        );
+    } else {
+        $cmd .= ' -' . $version;
+    }
+
+    $raw = shell_exec($cmd);
+    preg_match('/successful/', $raw, $match);
+    header('Content-Type: application/json; charset=utf-8');
+    if (!count($match)) {
+        return array(
+            'status' => 'error',
+            'message' => 'connect fail'
+        );
+    } else {
+        return array(
+            'status' => 'ok',
+            'message' => 'success'
+        );
+    }
+}
+
+?>
diff --git a/backend/route.php b/backend/route.php
index 19a54c2..5a545e3 100644
--- a/backend/route.php
+++ b/backend/route.php
@@ -4,6 +4,7 @@ include 'kms-cli.php';
 include 'kms-web.php';
 include 'kms-help.php';
 include 'kms-office.php';
+include 'kms-check.php';
 
 function isDomain($domain) {
     preg_match('/^(?=^.{3,255}$)[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+$/', $domain, $match);
@@ -14,6 +15,10 @@ function isIPv4($ip) {
     return filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV4);
 }
 
+function isIPv6($ip) {
+    return filter_var($ip, \FILTER_VALIDATE_IP, \FILTER_FLAG_IPV6);
+}
+
 $kmsHost = "{KMS_HOST}";
 $webSite = $kmsHost;
 if (isset($_SERVER['HTTP_HOST'])) { // 获取服务URL
@@ -110,6 +115,12 @@ if ($url == '/win-server/json') {
     exit;
 }
 
+if ($url == '/check') {
+    header('Content-Type: application/json; charset=utf-8');
+    echo json_encode(checkKms($_GET));
+    exit;
+}
+
 if ($_GET['cli'] == 'true') { // 无效请求
     echo 'Illegal Request' . PHP_EOL;
 } else {
@@ -117,4 +128,4 @@ if ($_GET['cli'] == 'true') { // 无效请求
     echo '{"status":"error","message":"Illegal Request"}';
 }
 
-?>
\ No newline at end of file
+?>