diff --git a/lib/update.js b/lib/update.js
index 4aa0e33..2109c26 100644
--- a/lib/update.js
+++ b/lib/update.js
@@ -62,21 +62,24 @@ async function update(isDdownload) {
     try {
         const { tag_name, assets, body: text } = await getLatestRelease('shanmiteko', 'LotteryAutoScript');
         if (checkVersion(version) < checkVersion(tag_name)) {
-            const download_url = assets
+            /**
+             * @type {{browser_download_url:string, size:number}[]}
+             */
+            const download_item = assets
                 .filter(({ name }) => checkPlatform(name))
-                .map(({ browser_download_url }) => browser_download_url);
-            if (download_url.length) {
+                .map(({ browser_download_url, size }) => { return { browser_download_url, size }; });
+            if (download_item.length) {
                 if (isDdownload) {
-                    await try_for_each(download_url.entries(), async ([i, url]) => {
-                        let proxy_url = 'https://mirror.ghproxy.com/';
-                        proxy_url += url;
+                    await try_for_each(download_item.entries(), async ([i, { browser_download_url, size }]) => {
+                        let proxy_url = 'https://ghfast.top/';
+                        proxy_url += browser_download_url;
                         log.warn('自动下载', `切换代理${proxy_url}`);
-                        await download(proxy_url, `latest_version${i}.zip`)
+                        await download(proxy_url, `latest_version${i}.zip`, size)
                             .catch(async err => {
                                 log.error('自动下载', err);
-                                proxy_url = url;
+                                proxy_url = browser_download_url;
                                 log.warn('自动下载', `使用原始链接${proxy_url}`);
-                                await download(proxy_url, `latest_version${i}.zip`);
+                                await download(proxy_url, `latest_version${i}.zip`, size);
                             });
                         return false;
                     });
diff --git a/lib/utils.js b/lib/utils.js
index 89d0a0e..08ad090 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -318,9 +318,10 @@ const utils = {
      * 下载文件
      * @param {string} url
      * @param {string} file_name
+     * @param {number} size
      * @returns {Promise<void | string>}
      */
-    download(url, file_name) {
+    download(url, file_name, size) {
         return new Promise((resolve, reject) => {
             send({
                 url,
@@ -340,6 +341,9 @@ const utils = {
                     resStream.pipe(wtbs);
                     wtbs.on('finish', () => {
                         utils.log.proPrint('下载完成');
+                        if (recv_length < size) {
+                            reject(`未正确下载文件: ${recv_length}B < ${size}B`);
+                        }
                         resolve();
                     }).on('error', error => {
                         wtbs.destroy();