diff --git a/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/dal/dataobject/devicewarinningrecord/WarningTrendPointRespDTO.java b/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/dal/dataobject/devicewarinningrecord/WarningTrendPointRespDTO.java
index e83a2d5..78eaa14 100644
--- a/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/dal/dataobject/devicewarinningrecord/WarningTrendPointRespDTO.java
+++ b/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/dal/dataobject/devicewarinningrecord/WarningTrendPointRespDTO.java
@@ -6,5 +6,5 @@ import lombok.Data;
 @Data
 public class WarningTrendPointRespDTO {
     private String timeKey;
-    private Long count;
+    private Long cnt;
 }
diff --git a/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/service/devicewarinningrecord/DeviceWarinningRecordServiceImpl.java b/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/service/devicewarinningrecord/DeviceWarinningRecordServiceImpl.java
index 574316a..4750412 100644
--- a/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/service/devicewarinningrecord/DeviceWarinningRecordServiceImpl.java
+++ b/yudao-module-iot/yudao-module-iot-biz/src/main/java/cn/iocoder/yudao/module/iot/service/devicewarinningrecord/DeviceWarinningRecordServiceImpl.java
@@ -287,8 +287,9 @@ public class DeviceWarinningRecordServiceImpl implements DeviceWarinningRecordSe
 
             List<WarningTrendPointRespDTO> rows = iotDeviceMapper.selectWarningTrendByHour(start, end);
             for (WarningTrendPointRespDTO row : rows) {
-                if (bucket.containsKey(row.getTimeKey())) {
-                    bucket.put(row.getTimeKey(), row.getCount() == null ? 0L : row.getCount());
+                String key = normalizeHourKey(row.getTimeKey()); // 按小时分支
+                if (bucket.containsKey(key)) {
+                    bucket.put(key, row.getCnt() == null ? 0L : row.getCnt());
                 }
             }
         } else {
@@ -303,8 +304,9 @@ public class DeviceWarinningRecordServiceImpl implements DeviceWarinningRecordSe
 
             List<WarningTrendPointRespDTO> rows = iotDeviceMapper.selectWarningTrendByDay(start, end);
             for (WarningTrendPointRespDTO row : rows) {
-                if (bucket.containsKey(row.getTimeKey())) {
-                    bucket.put(row.getTimeKey(), row.getCount() == null ? 0L : row.getCount());
+                String key = normalizeDayKey(row.getTimeKey()); // 按天分支
+                if (bucket.containsKey(key)) {
+                    bucket.put(key, row.getCnt() == null ? 0L : row.getCnt());
                 }
             }
         }
@@ -315,6 +317,23 @@ public class DeviceWarinningRecordServiceImpl implements DeviceWarinningRecordSe
         return resp;
     }
 
+    private String normalizeHourKey(String raw) {
+        if (raw == null) return null;
+        String s = raw.trim().replace('T', ' ');
+        if (s.length() >= 16) { // yyyy-MM-dd HH:mm...
+            return s.substring(0, 13) + ":00";
+        }
+        return s;
+    }
+
+    private String normalizeDayKey(String raw) {
+        if (raw == null) return null;
+        String s = raw.trim().replace('T', ' ');
+        if (s.length() >= 10) { // yyyy-MM-dd...
+            return s.substring(0, 10);
+        }
+        return s;
+    }
 
 
 }
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