diff --git a/packages/vant-cli/site/desktop/App.vue b/packages/vant-cli/site/desktop/App.vue
index 8a74c720a..3f54cb0c1 100644
--- a/packages/vant-cli/site/desktop/App.vue
+++ b/packages/vant-cli/site/desktop/App.vue
@@ -16,7 +16,8 @@ export default {
   },
 
   data() {
-    const publicPath = (config.site && config.site.publicPath) || '/';
+    const { site } = config.build || {};
+    const publicPath = (site && site.publicPath) || '/';
     return {
       config: config.site,
       simulator: `${publicPath}mobile.html${location.hash}`