diff --git a/internal/web/ui.go b/internal/web/ui.go
index 63e13ec..841c1a0 100644
--- a/internal/web/ui.go
+++ b/internal/web/ui.go
@@ -82,6 +82,7 @@ type PageData struct {
 	StandardResources        []storage.StandardResourceRecord
 	ResourceStatusBoard      *service.ResourceStatusBoard
 	AlarmRecords             []service.AlarmRecord
+	TodayAlarmCount          int
 	FaceGalleryPersons      []storage.PersonRecord
 	Templates                []service.Template
 	Template                 *service.Template
@@ -762,6 +763,13 @@ func (u *UI) pageDashboard(w http.ResponseWriter, r *http.Request) {
 	data.Title = "总览"
 	if u.alarmCollector != nil {
 		data.AlarmRecords = u.alarmCollector.GetRecent(5)
+		all := u.alarmCollector.GetRecent(9999)
+		today := time.Now().Format("2006-01-02")
+		for _, a := range all {
+			if strings.HasPrefix(a.Timestamp, today) {
+				data.TodayAlarmCount++
+			}
+		}
 	}
 	data.Tasks = nil
 	if u.tasks != nil {
diff --git a/internal/web/ui/templates/dashboard.html b/internal/web/ui/templates/dashboard.html
index e2f5930..fd37790 100644
--- a/internal/web/ui/templates/dashboard.html
+++ b/internal/web/ui/templates/dashboard.html
@@ -19,7 +19,7 @@
 <div class="stats">
   <div class="stat"><div class="k">设备总数</div><div class="v">{{.DeviceCount}}</div><div class="hint">已纳管的边缘设备</div></div>
   <div class="stat"><div class="k">在线率</div><div class="v">{{.OnlineCount}} / {{.DeviceCount}}</div><div class="hint">在线设备占比</div></div>
-  <div class="stat"><div class="k">离线节点</div><div class="v">{{.OfflineCount}}</div><div class="hint">需要检查网络或设备服务</div></div>
+  <div class="stat"><div class="k">离线节点</div><div class="v">{{.TodayAlarmCount}}</div><div class="hint">今日告警总数</div></div>
   <div class="stat"><div class="k">执行中任务</div><div class="v">{{.RunningTaskCount}}</div><div class="hint">正在下发或控制节点</div></div>
 </div>