diff --git a/src/component/Common/AnnouncementDialog.tsx b/src/component/Common/AnnouncementDialog.tsx
index 1cb5fbd..a138fda 100644
--- a/src/component/Common/AnnouncementDialog.tsx
+++ b/src/component/Common/AnnouncementDialog.tsx
@@ -27,7 +27,22 @@ const AnnouncementDialog = () => {
     dispatch(getAnnouncement());
   }, [dispatch]);
 
+  // 保存上次显示的公告内容，用于检测公告是否更新
+  const [lastAnnouncement, setLastAnnouncement] = useState("");
+
   useEffect(() => {
+    // 检查公告是否更新，如果更新了则清除"不再显示"状态
+    const hasAnnouncementChanged = announcement !== lastAnnouncement && lastAnnouncement !== "";
+    if (hasAnnouncementChanged) {
+      // 使用set方法将其设置为null来清除不再显示状态
+      SessionManager.set("announcement_dismissed", null);
+    }
+
+    // 更新上次显示的公告内容
+    if (announcement) {
+      setLastAnnouncement(announcement);
+    }
+
     // 检查是否应该显示公告
     const shouldShow =
       announcementEnabled &&
@@ -40,7 +55,7 @@ const AnnouncementDialog = () => {
       const timer = setTimeout(() => setOpen(true), 1000);
       return () => clearTimeout(timer);
     }
-  }, [announcement, announcementEnabled]);
+  }, [announcement, announcementEnabled, lastAnnouncement]);
 
   const handleClose = () => {
     if (dontShowAgain) {