diff --git a/.github/workflows/preview-build.yml b/.github/workflows/preview-build.yml
index 0fb82a15df..97db4c35a1 100644
--- a/.github/workflows/preview-build.yml
+++ b/.github/workflows/preview-build.yml
@@ -64,6 +64,8 @@ jobs:
       - name: npm run site
         id: site
         run: npm run site
+        env:
+          SITE_ENV: development
 
       - name: upload site artifact
         uses: actions/upload-artifact@v2
diff --git a/package.json b/package.json
index b34df3e257..57d00e3960 100644
--- a/package.json
+++ b/package.json
@@ -86,7 +86,7 @@
     "site:theme": "npm run site:theme-dark && npm run site:theme-compact",
     "site:theme-dark": "cross-env ESBUILD=1 ANT_THEME=dark bisheng build -c ./site/bisheng.config.js",
     "site:theme-compact": "cross-env ESBUILD=1 ANT_THEME=compact bisheng build -c ./site/bisheng.config.js",
-    "site": "npm run site:theme && cross-env NODE_ICU_DATA=node_modules/full-icu ESBUILD=1 concurrently \"bisheng build --ssr -c ./site/bisheng.config.js\"",
+    "site": "npm run site:theme && cross-env NODE_ICU_DATA=node_modules/full-icu ESBUILD=1 bisheng build --ssr -c ./site/bisheng.config.js",
     "sort": "npx sort-package-json",
     "sort-api": "antd-tools run sort-api-table",
     "start": "antd-tools run clean && cross-env NODE_ENV=development concurrently \"bisheng start -c ./site/bisheng.config.js\"",
diff --git a/site/bisheng.config.js b/site/bisheng.config.js
index 93c23082dd..86049f69b4 100644
--- a/site/bisheng.config.js
+++ b/site/bisheng.config.js
@@ -111,6 +111,13 @@ module.exports = {
 
     delete config.module.noParse;
 
+    // Use dev mod to speed up site preview build
+    // This is used for CI preview build in `preview-build.yml`
+    if (process.env.SITE_ENV === 'development') {
+      console.log('Site build with development mode...');
+      config.mode = 'development';
+    }
+
     if (ANT_THEME) {
       config.mode = 'development';
       config.plugins.forEach(plugin => {