diff --git a/static/js/utils/lang.js b/static/js/utils/lang.js
index 99875f4..4e9ebb4 100644
--- a/static/js/utils/lang.js
+++ b/static/js/utils/lang.js
@@ -51,6 +51,8 @@ const Lang = {
 
     init() {
         this._current = localStorage.getItem('turbosu-lang') || 'zh';
+        const btn = document.getElementById('lang-toggle');
+        if (btn) btn.textContent = this._current === 'zh' ? 'EN' : '中';
     },
 
     t(key) {