diff --git a/api/middleware/schedule/scheduledJobs.js b/api/middleware/schedule/scheduledJobs.js
index 3ab2088..07cbaa3 100644
--- a/api/middleware/schedule/scheduledJobs.js
+++ b/api/middleware/schedule/scheduledJobs.js
@@ -306,9 +306,32 @@ class ScheduledJobs {
                 return;
             }
 
-            // 为每个设备发送任务状态摘要
+            // 离线阈值：3分钟
+            const offlineThreshold = 3 * 60 * 1000; // 3分钟
+            const now = Date.now();
+
+            // 为每个在线设备发送任务状态摘要
             for (const account of accounts) {
                 const sn_code = account.sn_code;
+                
+                // 检查设备是否在线
+                const device = deviceManager.devices.get(sn_code);
+                
+                if (!device) {
+                    // 设备从未发送过心跳，视为离线，跳过
+                    continue;
+                }
+                
+                // 检查最后心跳时间
+                const lastHeartbeat = device.lastHeartbeat || 0;
+                const isOnline = device.isOnline && (now - lastHeartbeat < offlineThreshold);
+                
+                if (!isOnline) {
+                    // 设备离线，跳过
+                    continue;
+                }
+
+                // 设备在线，发送任务状态摘要
                 try {
                     await this.taskQueue.sendTaskStatusSummary(sn_code);
                 } catch (error) {
@@ -540,7 +563,8 @@ class ScheduledJobs {
                 // 如果存在上次投递记录，检查是否已经过了间隔时间
                 if (lastDeliverTask && lastDeliverTask.endTime) {
                     const lastDeliverTime = new Date(lastDeliverTask.endTime);
-                    const elapsedTime = now.getTime() - lastDeliverTime.getTime();
+
+                    const elapsedTime = new Date().getTime() - lastDeliverTime.getTime();
                     
                     if (elapsedTime < interval_ms) {
                         const remainingMinutes = Math.ceil((interval_ms - elapsedTime) / (60 * 1000));