diff --git a/templates/base.html b/templates/base.html
index c08a19b..212e862 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -4,7 +4,9 @@
     <meta content="text/html; charset=utf-8" http-equiv="content-type" />
     <meta name="viewport" content="width=device-width,initial-scale=1.0">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <link href="//cdn.staticfile.net/Primer/21.0.7/primer.css" rel="stylesheet" />
+    <link rel="stylesheet" href="https://s4.zstatic.net/ajax/libs/Primer/21.0.7/primer.css" integrity="sha512-k6BTjC0H/PMXYb3/2TOyBKaEnVrSXSY+9gDkqt/Pi6+CdXEN0ovok81P5UIPtS55+q1qzP9zCTw+i380wtNrgQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
+    <!-- otherwise use sustech mirrors -->
+    <link href="https://mirrors.sustech.edu.cn/cdnjs/ajax/libs/Primer/21.0.7/primer.css" rel="stylesheet" />
     <link rel="icon" href="{{ blogBase['faviconUrl'] }}">
     {%- if blogBase['themeMode']=='manual' -%}
     <script>