diff --git a/core/backend/apps/ai/creation.py b/core/backend/apps/ai/creation.py
index 1870816..ea21620 100644
--- a/core/backend/apps/ai/creation.py
+++ b/core/backend/apps/ai/creation.py
@@ -150,7 +150,8 @@ def _sync_segmented_video_message(message: CreationMessage) -> bool:
     """同步全能创作的多段出片。
 
     每段仍是普通 FREE_VIDEO 任务，故可沿用既有计费、轮询和资产落库；这里仅把它们聚合成
-    一张结果卡。所有分段完成后停在结果卡，绝不在此处触发 ffmpeg。
+    一张结果卡。任一片段先完成就先写回 GENERATING 卡供用户预览；所有分段完成后才转成
+    可合并的结果卡，绝不在此处触发 ffmpeg。
     """
     from .free_video import finalize_free_video
     from .models import AITask
@@ -189,16 +190,46 @@ def _sync_segmented_video_message(message: CreationMessage) -> bool:
         number = next((index + 1 for index, task in enumerate(refreshed) if task.id == failed.id), 1)
         fail_generating_message(message, f"第 {number} 段生成失败：{failed.error_message or '请重试'}")
         return True
+    assets: list[dict] = []
+    completed_segments = 0
+    for index, task in enumerate(refreshed, start=1):
+        if task.status != AITask.Status.SUCCEEDED:
+            continue
+        task_assets = _assets_from_task(task)
+        # 上游状态先成功、资产稍后才落库时，保留 GENERATING，下一轮再展示这段。
+        if not task_assets:
+            continue
+        completed_segments += 1
+        for asset in task_assets:
+            assets.append({**asset, "label": f"第 {index} 段", "segment_index": index})
+
+    # 先完成的片段必须立刻回到前端，不能等另一段慢任务一起完成才出现。
+    # 保持同一条 GENERATING 消息，避免把一个 60 秒视频拆成多条对话消息。
     if not all(task.status == AITask.Status.SUCCEEDED for task in refreshed):
+        progress = {
+            **payload,
+            "assets": assets,
+            "completed_segment_count": completed_segments,
+        }
+        if progress != payload:
+            message.payload = progress
+            message.save(update_fields=["payload", "updated_at"])
+            return True
+        return False
+
+    # 任务都成功但有片段的资产还在落库，继续保持生成中，避免最终结果缺片。
+    if completed_segments != len(refreshed):
+        progress = {
+            **payload,
+            "assets": assets,
+            "completed_segment_count": completed_segments,
+        }
+        if progress != payload:
+            message.payload = progress
+            message.save(update_fields=["payload", "updated_at"])
+            return True
         return False
 
-    assets: list[dict] = []
-    for index, task in enumerate(refreshed, start=1):
-        task_assets = _assets_from_task(task)
-        if not task_assets:
-            return False
-        for asset in task_assets:
-            assets.append({**asset, "label": f"第 {index} 段"})
     first = refreshed[0]
     finish_generating_message(
         message,
diff --git a/core/backend/apps/ai/test_creation_conversation.py b/core/backend/apps/ai/test_creation_conversation.py
index c6ac1cf..bc754af 100644
--- a/core/backend/apps/ai/test_creation_conversation.py
+++ b/core/backend/apps/ai/test_creation_conversation.py
@@ -161,6 +161,33 @@ class GenerationBackfillTests(TestCase):
         message.refresh_from_db()
         self.assertEqual(message.kind, CreationMessage.Kind.GENERATING)
 
+    def test_segmented_video_shows_completed_first_segment_before_second_finishes(self):
+        first = self._task(AITask.Status.SUCCEEDED, key="k-segment-first")
+        second = self._task(AITask.Status.POLLING, key="k-segment-second")
+        self._asset(first, url="https://cdn.example/segment-1.mp4")
+        message = append_message(
+            self.conversation,
+            role="assistant",
+            kind=CreationMessage.Kind.GENERATING,
+            task=first,
+            payload={
+                "kind": "video_segments",
+                "task_id": str(first.id),
+                "task_ids": [str(first.id), str(second.id)],
+                "segments": [
+                    {"index": 1, "task_id": str(first.id)},
+                    {"index": 2, "task_id": str(second.id)},
+                ],
+            },
+        )
+
+        self.assertEqual(sync_generating_messages(self.conversation), 1)
+        message.refresh_from_db()
+        self.assertEqual(message.kind, CreationMessage.Kind.GENERATING)
+        self.assertEqual(message.payload["completed_segment_count"], 1)
+        self.assertEqual(message.payload["assets"][0]["label"], "第 1 段")
+        self.assertEqual(message.payload["assets"][0]["url"], "https://cdn.example/segment-1.mp4")
+
     def test_retrieve_backfills_before_returning_messages(self):
         task = self._task(AITask.Status.SUCCEEDED, key="k-api")
         self._asset(task, url="https://cdn.example/api.png")
diff --git a/core/frontend/src/components/omni-param-bar.tsx b/core/frontend/src/components/omni-param-bar.tsx
index c78259b..d33e8c5 100644
--- a/core/frontend/src/components/omni-param-bar.tsx
+++ b/core/frontend/src/components/omni-param-bar.tsx
@@ -12,7 +12,7 @@ export const OMNI_RESOLUTIONS = ["1080p", "720p", "480p"];
 export const OMNI_RATIOS = ["9:16", "16:9", "1:1", "4:3", "3:4"];
 export const OMNI_VIDEO_DURATIONS = [
   "智能时长", "4 秒", "5 秒", "6 秒", "7 秒", "8 秒", "9 秒", "10 秒",
-  "11 秒", "12 秒", "13 秒", "14 秒", "15 秒", "30 秒",
+  "11 秒", "12 秒", "13 秒", "14 秒", "15 秒", "30 秒", "45 秒", "60 秒",
 ];
 export const OMNI_IMAGE_COUNTS = ["1 张", "2 张", "4 张", "8 张"];
 
@@ -70,11 +70,21 @@ function catalogModelLabels(
   return unique.length ? unique : fallback;
 }
 
-function durationLabelsForModel(config: ModelConfig | undefined, isVideo: boolean): string[] {
+function canCreateSegmentedVideo(config: ModelConfig | undefined, model: string): boolean {
+  // 31–60 秒不是单次 API 时长，而是平台会自动拆成 <=30 秒的两段。
+  // 只有 Seedance 2.5（或目录里声明了 30 秒能力的模型）可选这个总时长。
+  return modelDurations(config).some((seconds) => seconds >= 30)
+    || /seedance\s*2\.5/i.test(model || "");
+}
+
+function durationLabelsForModel(config: ModelConfig | undefined, model: string, isVideo: boolean): string[] {
   if (!isVideo) return [...OMNI_IMAGE_COUNTS];
   const seconds = modelDurations(config);
   if (!seconds.length) return [...OMNI_VIDEO_DURATIONS];
-  return ["智能时长", ...seconds.map((n) => `${n} 秒`)];
+  const segmented = canCreateSegmentedVideo(config, model) ? [45, 60] : [];
+  return ["智能时长", ...seconds, ...segmented]
+    .filter((seconds, index, values) => values.indexOf(seconds) === index)
+    .map((seconds) => typeof seconds === "number" ? `${seconds} 秒` : seconds);
 }
 
 export function OmniParamBar({
@@ -120,7 +130,7 @@ export function OmniParamBar({
   );
   const allowedRes = isVideo ? modelResolutions(selected) : [];
   const resolutions = withCurrent(allowedRes.length ? allowedRes : OMNI_RESOLUTIONS, resolution);
-  const durations = withCurrent(durationLabelsForModel(selected, isVideo), duration);
+  const durations = withCurrent(durationLabelsForModel(selected, model, isVideo), duration);
 
   useEffect(() => {
     setCustomOn(isVideo ? duration !== "智能时长" : true);
@@ -173,12 +183,15 @@ export function OmniParamBar({
     if (nextRes.length && resolution && !nextRes.includes(resolution)) {
       onResolution(nextRes.includes("720p") ? "720p" : nextRes[0]);
     }
-    const nextDur = durationLabelsForModel(selected, true);
-    if (duration && duration !== "智能时长" && !nextDur.includes(duration)) {
+    const nextDur = durationLabelsForModel(selected, model, true);
+    const seconds = Number(String(duration || "").replace(/\D/g, ""));
+    const isPlannedSegmentedDuration = seconds > 30 && seconds <= 60 && canCreateSegmentedVideo(selected, model);
+    // 60 秒是总时长，生成时会拆段；不要因为单段目录最高 30 秒就把它偷偷改回 8 秒/智能时长。
+    if (duration && duration !== "智能时长" && !nextDur.includes(duration) && !isPlannedSegmentedDuration) {
       onDuration(nextDur.includes("8 秒") ? "8 秒" : (nextDur.find((x) => x !== "智能时长") || "智能时长"));
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [selected?.id, isVideo]);
+  }, [selected?.id, isVideo, model]);
 
   return (
     <>
diff --git a/core/frontend/src/omni-session-page.css b/core/frontend/src/omni-session-page.css
index 2ec9aa2..d1466cd 100644
--- a/core/frontend/src/omni-session-page.css
+++ b/core/frontend/src/omni-session-page.css
@@ -1237,6 +1237,10 @@
   height: 220px;
 }
 
+.omni-result-media.is-grid .omni-process-frame {
+  height: 220px;
+}
+
 .omni-result-play {
   position: absolute;
   inset: 0;
diff --git a/core/frontend/src/routes/omni-session.tsx b/core/frontend/src/routes/omni-session.tsx
index 0e2c335..d5a7a75 100644
--- a/core/frontend/src/routes/omni-session.tsx
+++ b/core/frontend/src/routes/omni-session.tsx
@@ -1488,6 +1488,8 @@ function ConfirmCard({
   const cardIsVideo = message.payload.kind !== "image" && isVideo;
   const durationChanged =
     cardIsVideo && Boolean(draft.duration) && Boolean(snapshot.duration) && draft.duration !== snapshot.duration;
+  const durationSeconds = Number(String(draft.duration || "").replace(/\D/g, ""));
+  const willGenerateInSegments = cardIsVideo && durationSeconds > 30 && durationSeconds <= 60;
   const setField = (key: string, value: string) => setDraft((prev) => ({ ...prev, [key]: value }));
   const summary = paramLine(draft, cardIsVideo) || "当前参数";
   // 确认卡积分:改模型/分辨率/时长/张数时按后台挂牌实时重算(与后端 quote_* 同口径;标准团队系数=1)
@@ -1537,6 +1539,8 @@ function ConfirmCard({
       )}
       {durationChanged ? (
         <p className="omni-confirm-hint">改时长会重新生成脚本。确认后先重写方案，不会直接出片。</p>
+      ) : willGenerateInSegments ? (
+        <p className="omni-confirm-hint">{durationSeconds} 秒将拆成 2 段生成，每段最长 30 秒；片段完成后先给你预览，再由你决定是否合并成片。</p>
       ) : null}
       <div className="omni-confirm-foot">
         <span>{submitted ? "已确认，正在出片" : "点确认后才会提交生成"}</span>
@@ -1917,25 +1921,72 @@ function withoutLegacyGateArtifacts(list: CreationMessage[]): CreationMessage[]
   return hidden.size ? list.filter((message) => !hidden.has(message.id)) : list;
 }
 
-function ProcessCard({ payload }: { payload: Record<string, unknown> }) {
+function ProcessCard({
+  payload,
+  onPreview,
+}: {
+  payload: Record<string, unknown>;
+  onPreview?: (src: string, kind: "image" | "video", name: string) => void;
+}) {
   const isSegmentedVideo = payload.kind === "video_segments";
   const isMerge = payload.kind === "video_merge";
   const isVideo = payload.kind === "video" || isSegmentedVideo || isMerge;
   const segmentCount = Array.isArray(payload.segments) ? payload.segments.length : 0;
+  const assets = (payload.assets as Array<Record<string, string>> | undefined) || [];
+  const completedSegments = Number(payload.completed_segment_count || 0);
+  const waitingSegments = isSegmentedVideo ? Math.max(1, segmentCount - completedSegments) : 1;
   return (
     <section className="omni-result-card omni-process-card">
-      <div className="omni-result-media">
-        <figure className="omni-result-tile">
-          <div className="omni-process-frame" aria-hidden="true">
-            <span className="omni-process-ring" />
-            <strong>{isVideo ? "视频生成中" : "图片生成中"}</strong>
-          </div>
-        </figure>
+      <div className={`omni-result-media${isSegmentedVideo ? " is-grid" : ""}`}>
+        {assets.map((asset, index) => {
+          const cover = asset.cover || asset.url || "";
+          const url = asset.url || cover;
+          const video = asset.type === "video";
+          const label = String(asset.label || `第 ${index + 1} 段`);
+          return (
+            <figure className="omni-result-tile" key={asset.id || `${url}-${index}`}>
+              <button
+                type="button"
+                className="omni-result-preview"
+                onClick={() => url && onPreview?.(url, video ? "video" : "image", label)}
+              >
+                <img src={cover} alt={label} />
+                {video ? (
+                  <span className="omni-result-play" aria-hidden="true">
+                    <Play />
+                  </span>
+                ) : null}
+              </button>
+            </figure>
+          );
+        })}
+        {Array.from({ length: waitingSegments }).map((_, index) => (
+          <figure className="omni-result-tile" key={`generating-${index}`}>
+            <div className="omni-process-frame" aria-hidden="true">
+              <span className="omni-process-ring" />
+              <strong>{isVideo ? "视频生成中" : "图片生成中"}</strong>
+            </div>
+          </figure>
+        ))}
       </div>
       <div className="omni-result-info">
         <div>
-          <strong>{isMerge ? "正在合并成片" : isSegmentedVideo ? `正在生成 ${segmentCount || 2} 段视频` : isVideo ? "正在生成视频" : "正在出图"}</strong>
-          <small>{isMerge ? "正在拼接已确认的片段" : isSegmentedVideo ? "片段完成后会先展示给你确认" : isVideo ? "方案编译中，请稍候" : "画面生成中，请稍候"}</small>
+          <strong>{
+            isMerge
+              ? "正在合并成片"
+              : isSegmentedVideo && completedSegments
+                ? `第 ${completedSegments} 段已生成，正在生成第 ${completedSegments + 1} 段`
+                : isSegmentedVideo
+                  ? `正在生成 ${segmentCount || 2} 段视频`
+                  : isVideo ? "正在生成视频" : "正在出图"
+          }</strong>
+          <small>{
+            isMerge
+              ? "正在拼接已确认的片段"
+              : isSegmentedVideo && completedSegments
+                ? "已生成的片段可以先点击预览"
+                : isSegmentedVideo ? "片段完成后会先展示给你确认" : isVideo ? "方案编译中，请稍候" : "画面生成中，请稍候"
+          }</small>
         </div>
       </div>
     </section>
@@ -2772,7 +2823,13 @@ export function OmniSessionPage({
         );
       }
       case "generating":
-        return <ProcessCard key={message.clientKey || message.id} payload={message.payload} />;
+        return (
+          <ProcessCard
+            key={message.clientKey || message.id}
+            payload={message.payload}
+            onPreview={(src, kind, name) => setAssetPreview({ src, kind, name })}
+          />
+        );
       case "result":
         return (
           <ResultCard