diff --git a/src/main/java/com/kimgo/wepush/service/MonitorService.java b/src/main/java/com/kimgo/wepush/service/MonitorService.java
index e5386b8..c6e87e9 100644
--- a/src/main/java/com/kimgo/wepush/service/MonitorService.java
+++ b/src/main/java/com/kimgo/wepush/service/MonitorService.java
@@ -2,6 +2,8 @@ package com.kimgo.wepush.service;
 
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
+import com.kimgo.wepush.exceptions.DatabaseQueryException;
+import com.kimgo.wepush.exceptions.DatabaseUpdateException;
 import com.kimgo.wepush.mapper.DeviceInfoDAOMapper;
 import com.kimgo.wepush.model.DeviceInfoDAO;
 import com.kimgo.wepush.model.TextCardMessage;
@@ -14,7 +16,6 @@ import org.springframework.stereotype.Service;
 
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
-import java.util.Collections;
 import java.util.List;
 
 @Service
@@ -34,10 +35,18 @@ public class MonitorService {
 
     @Scheduled(fixedDelay = 480000)
     public void monitorOnlineDevices() {
-        List<DeviceInfoDAO> devices = getAllDevices();
+
+        List<DeviceInfoDAO> devices;
+        try {
+            devices = getAllDevices();
+        } catch (DatabaseQueryException e) {
+            logger.error("monitor online devices error.");
+            return;
+        }
         if (devices.isEmpty()) {
             // 没有找到数据的处理逻辑
             logger.info("no data was queried.");
+            return;
         }
         for (DeviceInfoDAO device : devices) {
             try {
@@ -58,7 +67,11 @@ public class MonitorService {
                     updateStatus(device, 1); // 设备在线
                     logger.info("update the device status to online.");
                 }
-            } catch (Exception e) {
+            } catch (DatabaseUpdateException dbe){
+                logger.error("update to mysql error.");
+                return;
+            }
+            catch (Exception e) {
                 logger.error("Error processing device with SN " + device.getSN(), e);
             }
         }
@@ -69,7 +82,7 @@ public class MonitorService {
      *
      * @return 包含所有id的列表。
      */
-    private List<DeviceInfoDAO> getAllDevices() {
+    private List<DeviceInfoDAO> getAllDevices() throws DatabaseQueryException {
         try {
             // 查询所有DeviceInfoDAO对象
             List<DeviceInfoDAO> deviceInfoDAOs = deviceInfoDAOMapper.selectList(new QueryWrapper<>());
@@ -77,8 +90,8 @@ public class MonitorService {
             return deviceInfoDAOs;
         } catch (Exception e) {
             logger.error("Error querying all device info IDs", e);
+            throw new  DatabaseQueryException("get all devices error.",e);
         }
-        return Collections.emptyList();
     }
 
 
@@ -121,7 +134,7 @@ public class MonitorService {
 
         return textCardMessage;
     }
-    private void updateStatus(DeviceInfoDAO device, int status) {
+    private void updateStatus(DeviceInfoDAO device, int status) throws DatabaseUpdateException {
         try {
             UpdateWrapper<DeviceInfoDAO> updateWrapper = new UpdateWrapper<>();
             updateWrapper.eq("SN", device.getSN());
@@ -135,6 +148,8 @@ public class MonitorService {
             }
         } catch (Exception e) {
             logger.error("Error updating status for SN: " + device.getSN(), e);
+            throw new DatabaseUpdateException("update to mysql error.",e);
+
         }
     }
 }