diff --git a/application/index/controller/admin/System.php b/application/index/controller/admin/System.php
index a0c357bf..2647bdb7 100644
--- a/application/index/controller/admin/System.php
+++ b/application/index/controller/admin/System.php
@@ -85,4 +85,9 @@ class System extends Base
             $this->success('发送成功');
         }
     }
+
+    public function upgrade()
+    {
+        (new \Upgrade(app()->getRootPath()))->exec();
+    }
 }
diff --git a/extend/Upgrade.php b/extend/Upgrade.php
new file mode 100644
index 00000000..62801269
--- /dev/null
+++ b/extend/Upgrade.php
@@ -0,0 +1,130 @@
+<?php
+/**
+ * Created by Wisp X
+ * User: Wisp X
+ * Date: 2020/3/13
+ * Time: 16:44
+ */
+
+class Upgrade
+{
+    const RELEASES_URL = 'https://api.lsky.pro/releases.php';
+
+    /**
+     * 程序根目录路径
+     *
+     * @var
+     */
+    private $path;
+
+    /**
+     * Upgrade constructor.
+     * @param $path 系统根目录绝对路径
+     */
+    public function __construct($path)
+    {
+        $this->path = rtrim(str_replace('\\', '/', $path), '/') . '/';
+    }
+
+    private function getNewest()
+    {
+        // TODO 获取最新版本号
+        return '1.5.8';
+    }
+
+    private function getPackage()
+    {
+        // TODO 获取增量包下载链接
+//        return 'https://github.com/wisp-x/lsky-pro/archive/v1.5.8.zip';
+        return 'https://wispx.coding.net/p/lsky-pro-releases/d/lsky-pro-releases/git/raw/master/releases/lsky-pro-1.5.8.zip';
+    }
+
+    /**
+     * 下载更新包
+     *
+     * @return string
+     * @throws Exception
+     */
+    private function download()
+    {
+        set_time_limit(0);
+        ini_set('max_execution_time', 0);
+        ini_set('memory_limit', '256M');
+
+        $headers = [
+            'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36'
+        ];
+
+        $curl = curl_init();
+        curl_setopt($curl, CURLOPT_URL, $this->getPackage());
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
+        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
+        curl_setopt($curl, CURLOPT_TIMEOUT, 180);
+        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 180);
+        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
+        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
+        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
+        $contents = curl_exec($curl);
+        $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+        curl_close($curl);
+
+        if ($statusCode !== 200) {
+            throw new \Exception('增量包下载失败, 请稍后重试!');
+        }
+
+        if (!is_dir($this->path . 'runtime')) @mkdir($this->path . 'runtime', 0777, true);
+
+        $pathname = $this->path . 'runtime/upgrade.zip';
+        if (!@file_put_contents($pathname, $contents)) {
+            throw new \Exception('更新包保存失败, 请检查 runtime 目录是否有写入权限');
+        }
+
+        // TODO 校验 MD5, 校验失败则删除文件并抛出异常
+
+        return $pathname;
+    }
+
+    /**
+     * 解压
+     *
+     * @param string $file 文件
+     * @param string $dir  解压到文件夹
+     * @return mixed
+     * @throws Exception
+     */
+    private function unzip($file, $dir)
+    {
+        if (!class_exists('ZipArchive')) {
+            throw new \Exception('无法解压更新包, 请确保 ZipArchive 正确安装');
+        }
+
+        @unlink($dir) && @mkdir($dir, 0777, true);
+
+        $zip = new ZipArchive;
+        if ($zip->open($file) !== true) {
+            throw new \Exception('无法打开更新包文件');
+        }
+        if (!$zip->extractTo($dir)) {
+            $zip->close();
+            throw new \Exception('无法解压更新包文件');
+        }
+
+        $zip->close();
+        @unlink($file); // 解压成功后删除临时文件
+
+        return $dir;
+    }
+
+    public function exec()
+    {
+        try {
+            $file = $this->download();
+
+            // 解压文件
+            $this->unzip($file, $this->path . 'runtime/.tmp');
+
+        } catch (\Exception $e) {
+            dump($e->getMessage());exit;
+        }
+    }
+}