diff --git a/postinstall.js b/postinstall.js
index 400ce29..5e2a6fd 100644
--- a/postinstall.js
+++ b/postinstall.js
@@ -1,25 +1,50 @@
-const download = require("download");
-const fs = require("fs-extra");
-const path = require("path");
-const package = require("./package.json");
-const crypto = require("crypto");
+const download = require('download');
+const fs = require('fs-extra');
+const path = require('path');
+const package = require('./package.json');
+const crypto = require('crypto');
+const https = require('https');
+
+const mirror = {
+  CN: 'download.fastgit.org',
+};
 
 (async () => {
-  const stubPath = path.join(__dirname, "stub");
+  const stubPath = path.join(__dirname, 'stub');
   if (fs.existsSync(stubPath)) process.exit(0);
-  const stubParts = ["stub", process.platform, process.arch];
-  if (process.platform === "linux" && process.arch === "arm")
+  const stubParts = ['stub', process.platform, process.arch];
+  if (process.platform === 'linux' && process.arch === 'arm')
     stubParts.push(process.config.variables.arm_version);
-  const stubName = stubParts.join("--");
-  const downloadPath = `https://github.com/leafac/caxa/releases/download/v${package.version}/${stubName}`;
+  const stubName = stubParts.join('--');
+  const getdownloadPath = domain =>
+    `https://${domain}/leafac/caxa/releases/download/v${package.version}/${stubName}`;
+  const getMirrorDomain = () => {
+    let data = '';
+    return new Promise(resolve => {
+      // get country info
+      const get = https.get('https://api.hostip.info/country.php', res => {
+        res.setEncoding('utf8');
+        res.on('data', chunk => {
+          data += chunk;
+        });
+        res.on('end', () => {
+          resolve(
+            mirror[data.toString()] ? mirror[data.toString()] : 'github.com'
+          );
+        });
+      });
+      get.end();
+    });
+  };
+  const downloadPath = getdownloadPath(await getMirrorDomain());
   await fs.writeFile(stubPath, await download(downloadPath), { mode: 0o755 });
-  const checksumsPath = path.join(__dirname, "checksums.txt");
+  const checksumsPath = path.join(__dirname, 'checksums.txt');
   if (!fs.existsSync(checksumsPath)) process.exit(0);
-  const checksums = await fs.readFile(checksumsPath, "utf8");
+  const checksums = await fs.readFile(checksumsPath, 'utf8');
   const stubHash = crypto
-    .createHash("sha256")
+    .createHash('sha256')
     .update(await fs.readFile(stubPath))
-    .digest("hex");
+    .digest('hex');
   const checksumLine = `${stubHash}  ${stubName}`;
   if (!checksums.includes(checksumLine)) {
     console.error(`Checksum verification failed: ‘${checksumLine}’`);