diff --git a/src/App.vue b/src/App.vue
index e613056..71c6cc2 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -2,17 +2,67 @@
   <el-config-provider :locale="appStore.locale" :size="appStore.size">
     <router-view />
     <RealtimeAlarmModal />
+    <div v-if="offlineAlertActive" class="offline-breath-overlay"></div>
   </el-config-provider>
 </template>
 
 <script setup lang="ts">
+import { ElMessageBox } from 'element-plus';
 import RealtimeAlarmModal from '@/components/alarm/RealtimeAlarmModal.vue';
 import { useSettingsStore } from '@/store/modules/settings';
 import { handleThemeStyle } from '@/utils/theme';
 import { useAppStore } from '@/store/modules/app';
+import { closeAlarmReminder, connectAlarmReminder, onAlarmReminderOvertime } from '@/utils/alarmReminder';
 
 const appStore = useAppStore();
+const offlineAlertActive = ref(false);
+let offlineAlertTimer: ReturnType<typeof setTimeout> | null = null;
 
+const playOfflineVoice = (objid: string) => {
+  if (typeof window === 'undefined' || !('speechSynthesis' in window)) {
+    return;
+  }
+
+  window.speechSynthesis.cancel();
+  const utterance = new SpeechSynthesisUtterance(`设备${objid}离线`);
+  utterance.lang = 'zh-CN';
+  window.speechSynthesis.speak(utterance);
+};
+
+const triggerOfflineEffect = () => {
+  offlineAlertActive.value = false;
+
+  if (offlineAlertTimer) {
+    clearTimeout(offlineAlertTimer);
+  }
+
+  requestAnimationFrame(() => {
+    offlineAlertActive.value = true;
+    offlineAlertTimer = setTimeout(() => {
+      offlineAlertActive.value = false;
+      offlineAlertTimer = null;
+    }, 6000);
+  });
+};
+
+const showOfflineDialog = (objid: string) => {
+  ElMessageBox.alert(`设备${objid}离线`, '离线报警', {
+    type: 'warning',
+    confirmButtonText: '确定'
+  }).catch(() => undefined);
+};
+
+connectAlarmReminder(() => {});
+onAlarmReminderOvertime((device) => {
+  const objid = String(device?.objid ?? '');
+  if (!objid) {
+    return;
+  }
+
+  playOfflineVoice(objid);
+  showOfflineDialog(objid);
+  triggerOfflineEffect();
+});
 
 onMounted(() => {
   nextTick(() => {
@@ -20,4 +70,42 @@ onMounted(() => {
     handleThemeStyle(useSettingsStore().theme);
   });
 });
+
+onBeforeUnmount(() => {
+  if (offlineAlertTimer) {
+    clearTimeout(offlineAlertTimer);
+    offlineAlertTimer = null;
+  }
+
+  if (typeof window !== 'undefined' && 'speechSynthesis' in window) {
+    window.speechSynthesis.cancel();
+  }
+
+  closeAlarmReminder();
+});
 </script>
+
+<style scoped>
+.offline-breath-overlay {
+  position: fixed;
+  inset: 0;
+  pointer-events: none;
+  z-index: 999998;
+  box-shadow:
+    inset 0 0 24px rgba(255, 40, 40, 0.85),
+    inset 0 0 64px rgba(255, 40, 40, 0.55),
+    inset 0 0 120px rgba(255, 40, 40, 0.3);
+  animation: offline-breath 1.5s ease-in-out infinite;
+}
+
+@keyframes offline-breath {
+  0%,
+  100% {
+    opacity: 0.25;
+  }
+
+  50% {
+    opacity: 1;
+  }
+}
+</style>
diff --git a/src/utils/alarmReminder.js b/src/utils/alarmReminder.js
index 1dac36e..b34f693 100644
--- a/src/utils/alarmReminder.js
+++ b/src/utils/alarmReminder.js
@@ -1 +1,119 @@
 const websocketUrl = 'ws://119.45.202.115:7181/ws';
+const deviceDataTime = {};
+const overtime = 1000 * 60 * 10;
+// const overtime = 1000;
+let alarmReminderSocket = null;
+let overtimeTimer = null;
+let overtimeCallback = null;
+
+const resolveMessagePayload = (data) => {
+  if (typeof data !== 'string') {
+    return data;
+  }
+
+  try {
+    return JSON.parse(data, (key, value) => {
+      if (key === 'objid' && value !== null && value !== undefined) {
+        return String(value);
+      }
+
+      return value;
+    });
+  } catch {
+    return data;
+  }
+};
+
+const updateDeviceDataTime = (payload) => {
+  const monitorId = payload?.deviceParam?.monitorId;
+  const objid = payload?.deviceParam?.objid;
+
+  if (!monitorId || objid === undefined || objid === null) {
+    return;
+  }
+
+  deviceDataTime[monitorId] = {
+    objid: String(objid),
+    time: Date.now()
+  };
+};
+
+const startOvertimeTimer = () => {
+  if (overtimeTimer) {
+    return;
+  }
+
+  overtimeTimer = setInterval(() => {
+    if (typeof overtimeCallback !== 'function') {
+      return;
+    }
+
+    const now = Date.now();
+
+    Object.keys(deviceDataTime).forEach((monitorId) => {
+      const item = deviceDataTime[monitorId];
+
+      if (!item || now - item.time <= overtime) {
+        return;
+      }
+
+      overtimeCallback({
+        monitorId,
+        ...item
+      });
+      delete deviceDataTime[monitorId];
+    });
+  }, 1000);
+};
+
+export const connectAlarmReminder = (onMessage, url = websocketUrl) => {
+  if (typeof onMessage !== 'function') {
+    throw new Error('connectAlarmReminder 需要传入消息回调函数');
+  }
+
+  if (alarmReminderSocket) {
+    alarmReminderSocket.close();
+  }
+
+  alarmReminderSocket = new WebSocket(url);
+
+  alarmReminderSocket.onmessage = (event) => {
+    const payload = resolveMessagePayload(event.data);
+    updateDeviceDataTime(payload);
+    onMessage(payload, event);
+  };
+
+  return alarmReminderSocket;
+};
+
+export const onAlarmReminderOvertime = (callback) => {
+  if (typeof callback !== 'function') {
+    throw new Error('onAlarmReminderOvertime 需要传入超时回调函数');
+  }
+
+  overtimeCallback = callback;
+  startOvertimeTimer();
+};
+
+export const closeAlarmReminder = () => {
+  if (!alarmReminderSocket) {
+    if (overtimeTimer) {
+      clearInterval(overtimeTimer);
+      overtimeTimer = null;
+    }
+    overtimeCallback = null;
+    return;
+  }
+
+  alarmReminderSocket.close();
+  alarmReminderSocket = null;
+
+  if (overtimeTimer) {
+    clearInterval(overtimeTimer);
+    overtimeTimer = null;
+  }
+
+  overtimeCallback = null;
+};
+
+export { websocketUrl, deviceDataTime, overtime };