diff --git a/app/services/ai_state.py b/app/services/ai_state.py
index 94ce460..c6fe184 100644
--- a/app/services/ai_state.py
+++ b/app/services/ai_state.py
@@ -43,9 +43,9 @@ def get_whitelist() -> list[str]:
 
 
 def is_whitelisted(user_id: str) -> bool:
-    """检查用户是否在 AI 白名单中"""
+    """检查用户是否在 AI 白名单中（不区分大小写）"""
     whitelist = get_whitelist()
     if not whitelist:
         # 白名单为空则所有人都可以操作
         return True
-    return user_id in whitelist
+    return user_id.lower() in [u.lower() for u in whitelist]