diff --git a/src/main/java/com/kimgo/wepush/service/MonitorService.java b/src/main/java/com/kimgo/wepush/service/MonitorService.java
index 89a6cb6..1a0ff70 100644
--- a/src/main/java/com/kimgo/wepush/service/MonitorService.java
+++ b/src/main/java/com/kimgo/wepush/service/MonitorService.java
@@ -44,11 +44,17 @@ public class MonitorService {
                     continue;
                 }
                 long currentTimeMillis = System.currentTimeMillis();
-                if (currentTimeMillis - device.getLastOnlineTime() > device.getTimeOutPeriod()) {
+                long timeDifferenceMillis = currentTimeMillis - device.getLastOnlineTime();
+                long timeDifferenceSeconds = timeDifferenceMillis / 1000;
+                if (timeDifferenceSeconds > device.getTimeOutPeriod()) {
+                    logger.info("currentTimeMillis: {},device LastOnlineTime: {},时间差: {},设备超时时间: {}",currentTimeMillis,
+                            device.getLastOnlineTime(),timeDifferenceSeconds,device.getTimeOutPeriod());
                     updateStatus(device, 0); // 设备离线
+                    logger.info("Update the device status to offline.");
                     sendNotification(device);
                 } else {
                     updateStatus(device, 1); // 设备在线
+                    logger.info("update the device status to online.");
                 }
             } catch (Exception e) {
                 logger.error("Error processing device with SN " + device.getSN(), e);