diff --git a/apps/web-antd/src/views/aiot/alarm/list/index.vue b/apps/web-antd/src/views/aiot/alarm/list/index.vue
index 7347eae3b..8636f71cc 100644
--- a/apps/web-antd/src/views/aiot/alarm/list/index.vue
+++ b/apps/web-antd/src/views/aiot/alarm/list/index.vue
@@ -22,8 +22,10 @@ import {
 defineOptions({ name: 'AiotAlarmList' });
 
 /** 格式化持续时长（毫秒 → 可读文本） */
-function formatDuration(ms: number): string {
-  if (!ms || ms <= 0) return '--';
+function formatDuration(ms: number | null | undefined): string {
+  // 当 duration_ms 为 null 时，说明告警仍在进行中
+  if (ms === null || ms === undefined) return '进行中';
+  if (ms <= 0) return '--';
   if (ms < 60000) {
     return `${Math.round(ms / 1000)} 秒`;
   }
@@ -218,10 +220,7 @@ const [Grid, gridApi] = useVbenVxeGrid({
 
       <!-- 持续时长列 -->
       <template #duration="{ row }">
-        <span v-if="row.durationMs != null && row.durationMs > 0">{{
-          formatDuration(row.durationMs)
-        }}</span>
-        <span v-else class="text-gray-400">--</span>
+        <span>{{ formatDuration(row.durationMs) }}</span>
       </template>
 
       <!-- 结束时间列 -->
@@ -333,11 +332,7 @@ const [Grid, gridApi] = useVbenVxeGrid({
           </div>
           <div>
             <span class="text-gray-500">持续时长：</span>
-            <span>{{
-              currentAlert.durationMs != null && currentAlert.durationMs > 0
-                ? formatDuration(currentAlert.durationMs)
-                : '-'
-            }}</span>
+            <span>{{ formatDuration(currentAlert.durationMs) }}</span>
           </div>
           <div>
             <span class="text-gray-500">触发时间：</span>