diff --git a/intc-modules/intc-iot/src/main/java/com/intc/iot/controller/IotController.java b/intc-modules/intc-iot/src/main/java/com/intc/iot/controller/IotController.java
index b99ea3b..2e1dd2a 100644
--- a/intc-modules/intc-iot/src/main/java/com/intc/iot/controller/IotController.java
+++ b/intc-modules/intc-iot/src/main/java/com/intc/iot/controller/IotController.java
@@ -223,6 +223,10 @@ public class IotController extends BaseController {
         int updated = 0;
         int skipped = 0;
         int failed = 0;
+        int noReportTime = 0;
+        int updateNoRows = 0;
+        List<Map<String, Object>> skippedSamples = new java.util.ArrayList<>();
+        List<Map<String, Object>> failedSamples = new java.util.ArrayList<>();
 
         List<Device> devices = deviceMapper.selectList(
             new com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper<Device>()
@@ -236,7 +240,9 @@ public class IotController extends BaseController {
             try {
                 String latestTime = deviceSensorDataService.getLatestReportTime(device.getSerialNum());
                 if (latestTime == null || latestTime.isBlank()) {
+                    noReportTime++;
                     skipped++;
+                    addBackfillSample(skippedSamples, device, "TDengine未查到最新上数时间");
                     continue;
                 }
 
@@ -246,10 +252,13 @@ public class IotController extends BaseController {
                 if (deviceMapper.updateById(updateDevice) > 0) {
                     updated++;
                 } else {
+                    updateNoRows++;
                     skipped++;
+                    addBackfillSample(skippedSamples, device, "业务库更新影响行数为0");
                 }
             } catch (Exception e) {
                 failed++;
+                addBackfillSample(failedSamples, device, e.getMessage());
                 log.warn("回填设备最后上数时间失败: deviceId={}, serialNum={}, error={}",
                     device.getId(), device.getSerialNum(), e.getMessage());
             }
@@ -260,9 +269,24 @@ public class IotController extends BaseController {
         result.put("updated", updated);
         result.put("skipped", skipped);
         result.put("failed", failed);
+        result.put("noReportTime", noReportTime);
+        result.put("updateNoRows", updateNoRows);
+        result.put("skippedSamples", skippedSamples);
+        result.put("failedSamples", failedSamples);
         return result;
     }
 
+    private void addBackfillSample(List<Map<String, Object>> samples, Device device, String reason) {
+        if (samples.size() >= 10) {
+            return;
+        }
+        Map<String, Object> sample = new java.util.HashMap<>();
+        sample.put("deviceId", device.getId());
+        sample.put("serialNum", device.getSerialNum());
+        sample.put("reason", reason);
+        samples.add(sample);
+    }
+
     private Date parseReportTime(String time) {
         String normalized = normalizeReportTime(time);
         return Date.from(LocalDateTime.parse(normalized, DATETIME_FORMATTER)
diff --git a/intc-modules/intc-tdengine/src/main/java/com/intc/tdengine/service/impl/DeviceSensorDataService.java b/intc-modules/intc-tdengine/src/main/java/com/intc/tdengine/service/impl/DeviceSensorDataService.java
index fb7cdb8..698400a 100644
--- a/intc-modules/intc-tdengine/src/main/java/com/intc/tdengine/service/impl/DeviceSensorDataService.java
+++ b/intc-modules/intc-tdengine/src/main/java/com/intc/tdengine/service/impl/DeviceSensorDataService.java
@@ -266,17 +266,18 @@ public class DeviceSensorDataService  implements IDeviceSensorDataService {
             return null;
         }
         try {
-            Integer exists = deviceSensorDataMapper.checkTableExists(serialNum);
-            if (exists == null || exists == 0) {
-                return null;
-            }
             DeviceSensorData latest = deviceSensorDataMapper.getLatestReportTime(serialNum);
             if (latest == null) {
                 return null;
             }
             return latest.getCreateTime() != null ? latest.getCreateTime() : latest.getTime();
         } catch (Exception e) {
-            log.warn("查询设备最新上数时间失败: serialNum={}, error={}", serialNum, e.getMessage());
+            String errorMsg = e.getMessage();
+            if (errorMsg != null && errorMsg.toLowerCase().contains("not exist")) {
+                log.debug("设备TDengine子表不存在或无数据: serialNum={}", serialNum);
+            } else {
+                log.warn("查询设备最新上数时间失败: serialNum={}, error={}", serialNum, errorMsg);
+            }
             return null;
         }
     }