diff --git a/src/main/java/com/kimgo/wepush/service/MonitorService.java b/src/main/java/com/kimgo/wepush/service/MonitorService.java
index c6e87e9..fb65678 100644
--- a/src/main/java/com/kimgo/wepush/service/MonitorService.java
+++ b/src/main/java/com/kimgo/wepush/service/MonitorService.java
@@ -58,8 +58,8 @@ public class MonitorService {
                 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());
+                    logger.info("Device offline. SN: {}, LastOnlineTime: {}, TimeDifference: {}, TimeoutPeriod: {}",
+                            device.getSN(), device.getLastOnlineTime(), timeDifferenceSeconds, device.getTimeOutPeriod());
                     updateStatus(device, 0); // 设备离线
                     logger.info("Update the device status to offline.");
                     sendNotification(device);