diff --git a/src/features/production/components/ShotProductionAssets.vue b/src/features/production/components/ShotProductionAssets.vue
index c063f22..71d4e14 100644
--- a/src/features/production/components/ShotProductionAssets.vue
+++ b/src/features/production/components/ShotProductionAssets.vue
@@ -67,6 +67,7 @@ const canGenerateVideo = computed(
         !assetBlocked.value && !activeVideo.value && !!props.videoReadiness && props.videoReadiness.issues.length === 0
 )
 const keyframeStale = computed(() => !!props.keyframeReadiness?.primaryKeyframeStale)
+const videoStale = computed(() => !!props.videoReadiness?.primaryVideoStale)
 
 watch(key, () => {
     confirmingKeyframe.value = ''
@@ -265,9 +266,7 @@ async function inspectSpecs() {
                             <StatusBadge :status="item.status" :label="productionStatusLabel(item.status)" />
                             <span v-if="item.isPrimary" class="tag">主首帧</span>
                             <span v-if="item.isPrimary && keyframeStale" class="tag">已过期</span>
-                            <span class="text-[10px] text-muted"
-                                >{{ item.width || '—' }} × {{ item.height || '—' }}</span
-                            >
+                            <span class="text-[10px] text-muted">{{ item.width || '—' }} × {{ item.height || '—' }}</span>
                         </div>
                         <p v-if="item.error" class="mt-2 line-clamp-3 text-xs text-danger">{{ item.error }}</p>
                         <p class="mt-2 text-[10px] text-muted">{{ formatDate(item.createdAt) }}</p>
@@ -304,9 +303,12 @@ async function inspectSpecs() {
                 <StatusBadge
                     v-if="videoReadiness"
                     :status="videoReadiness.status"
-                    :label="productionStatusLabel(videoReadiness.status)"
+                    :label="videoStale ? '主视频已过期' : productionStatusLabel(videoReadiness.status)"
                 />
             </div>
+            <p v-if="videoStale" class="alert mt-3 text-xs" role="status">
+                当前主视频使用的主首帧或主体参考图已经变化。旧视频仍保留；重新生成完成后，新视频会自动接替过期主视频。
+            </p>
             <ul v-if="videoReadiness?.issues.length" class="mt-3 space-y-2 text-xs text-danger">
                 <li v-for="issue in videoReadiness.issues" :key="issue.code">
                     {{ issueLabel(issue.code) }}：{{ issue.reason }}
@@ -325,9 +327,8 @@ async function inspectSpecs() {
                         <div class="flex flex-wrap items-center gap-2">
                             <StatusBadge :status="item.status" :label="productionStatusLabel(item.status)" />
                             <span v-if="item.isPrimary" class="tag">主视频</span>
-                            <span class="text-[10px] text-muted"
-                                >{{ item.durationSeconds || shot.durationSeconds || '—' }}s</span
-                            >
+                            <span v-if="item.isPrimary && videoStale" class="tag">已过期</span>
+                            <span class="text-[10px] text-muted">{{ item.durationSeconds || shot.durationSeconds || '—' }}s</span>
                         </div>
                         <p v-if="item.error" class="alert alert-error mt-3" role="alert">{{ item.error }}</p>
                         <p class="mt-3 break-all text-[10px] text-muted">
@@ -340,8 +341,8 @@ async function inspectSpecs() {
                                 target="_blank"
                                 rel="noopener noreferrer"
                                 class="text-button"
-                                >打开视频<ExternalLink :size="12"
-                            /></a>
+                                >打开视频<ExternalLink :size="12" /></a
+                            >
                             <button
                                 v-if="item.status === 'completed' && item.videoUrl && !item.isPrimary"
                                 class="text-button"
@@ -364,13 +365,15 @@ async function inspectSpecs() {
             <p v-else class="mt-4 text-xs text-muted">尚无视频任务记录。</p>
             <div class="mt-4 flex flex-wrap gap-3">
                 <ConfirmAction
-                    :label="currentVideo ? '再生成一个视频候选' : '提交本镜视频任务'"
+                    :label="videoStale ? '重新生成主视频' : currentVideo ? '再生成一个视频候选' : '提交本镜视频任务'"
                     :disabled="!canGenerateVideo"
                     acknowledgement
                     :description="
-                        currentVideo
-                            ? '使用当前视频提示词、主首帧和主体参考图新增一个 Seedance 视频候选，不自动替换主视频。'
-                            : '使用当前视频提示词、主首帧和主体参考图创建 Seedance 任务；任务会在后台继续运行。'
+                        videoStale
+                            ? '使用当前视频提示词、主首帧和主体参考图重新创建 Seedance 任务；完成后会自动接替当前过期主视频。'
+                            : currentVideo
+                              ? '使用当前视频提示词、主首帧和主体参考图新增一个 Seedance 视频候选，不自动替换主视频。'
+                              : '使用当前视频提示词、主首帧和主体参考图创建 Seedance 任务；任务会在后台继续运行。'
                     "
                     primary
                     @confirm="generateVideo"
@@ -425,4 +428,4 @@ async function inspectSpecs() {
             @generate="generateKeyframe"
         />
     </section>
-</template>
+</template>
\ No newline at end of file