diff --git a/web/src/components/GenerationCard.tsx b/web/src/components/GenerationCard.tsx
index 8e3a3e8..9624728 100644
--- a/web/src/components/GenerationCard.tsx
+++ b/web/src/components/GenerationCard.tsx
@@ -4,7 +4,7 @@ import type { GenerationTask } from '../types';
 import { useGenerationStore } from '../store/generation';
 import { showToast } from './Toast';
 import { ConfirmModal } from './ConfirmModal';
-import { tosThumb } from '../lib/api';
+import { tosThumb, rewriteTosUrl } from '../lib/api';
 import styles from './GenerationCard.module.css';
 
 const EditIcon = () => (
@@ -299,7 +299,7 @@ export function GenerationCard({ task, onOpenDetail }: Props) {
                 onMouseLeave={() => setRefPreview(null)}
               >
                 {ref.type === 'video' ? (
-                  <video src={ref.previewUrl} className={styles.refMedia} muted />
+                  <video src={rewriteTosUrl(ref.previewUrl)} className={styles.refMedia} muted />
                 ) : ref.type === 'audio' ? (
                   <div className={styles.audioThumb}>
                     <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
@@ -422,7 +422,7 @@ export function GenerationCard({ task, onOpenDetail }: Props) {
       {refPreview && createPortal(
         <div className={styles.mentionPreview} style={{ top: refPreview.top, left: refPreview.left }}>
           {refPreview.type === 'video' ? (
-            <video src={refPreview.url} className={styles.mentionPreviewImg} autoPlay loop muted playsInline />
+            <video src={rewriteTosUrl(refPreview.url)} className={styles.mentionPreviewImg} autoPlay loop muted playsInline />
           ) : (
             <img src={tosThumb(refPreview.url, 300)} alt={refPreview.label} className={styles.mentionPreviewImg} />
           )}
@@ -460,7 +460,7 @@ export function GenerationCard({ task, onOpenDetail }: Props) {
           >
             <video
               ref={videoRef}
-              src={task.resultUrl}
+              src={rewriteTosUrl(task.resultUrl)}
               className={styles.resultMedia}
               loop
               preload="metadata"
diff --git a/web/src/components/PromptInput.tsx b/web/src/components/PromptInput.tsx
index 21d1ea0..ce41da8 100644
--- a/web/src/components/PromptInput.tsx
+++ b/web/src/components/PromptInput.tsx
@@ -1,7 +1,7 @@
 import { useRef, useEffect, useCallback, useState } from 'react';
 import DOMPurify from 'dompurify';
 import { useInputBarStore } from '../store/inputBar';
-import { assetsApi, tosThumb } from '../lib/api';
+import { assetsApi, tosThumb, rewriteTosUrl } from '../lib/api';
 import type { UploadedFile, AssetSearchResult } from '../types';
 import { parseAssetMentionsFromDOM } from '../lib/assetMentions';
 import { showToast } from './Toast';
@@ -694,7 +694,7 @@ export function PromptInput() {
                 >
                   <div className={styles.mentionThumb}>
                     {ref.type === 'video' ? (
-                      <video src={ref.previewUrl} muted className={styles.thumbMedia} />
+                      <video src={rewriteTosUrl(ref.previewUrl)} muted className={styles.thumbMedia} />
                     ) : ref.type === 'audio' ? (
                       <span style={{ fontSize: 16 }}>{'\u266B'}</span>
                     ) : (
@@ -752,7 +752,7 @@ export function PromptInput() {
         >
           {hoverRef.type === 'video' ? (
             <video
-              src={hoverRef.previewUrl}
+              src={rewriteTosUrl(hoverRef.previewUrl)}
               autoPlay
               loop
               muted
diff --git a/web/src/components/UniversalUpload.tsx b/web/src/components/UniversalUpload.tsx
index 647888f..5e23475 100644
--- a/web/src/components/UniversalUpload.tsx
+++ b/web/src/components/UniversalUpload.tsx
@@ -2,7 +2,7 @@ import { useRef, useState } from 'react';
 import { useInputBarStore } from '../store/inputBar';
 import { showToast } from './Toast';
 import { ImageLightbox } from './ImageLightbox';
-import { tosThumb } from '../lib/api';
+import { tosThumb, rewriteTosUrl } from '../lib/api';
 import styles from './UniversalUpload.module.css';
 
 const Spinner = () => (
@@ -143,7 +143,7 @@ export function UniversalUpload() {
               >
                 <div className={styles.thumbInner}>
                   {ref.type === 'video' ? (
-                    <video src={ref.previewUrl} className={styles.thumbMedia} muted />
+                    <video src={rewriteTosUrl(ref.previewUrl)} className={styles.thumbMedia} muted />
                   ) : ref.type === 'audio' ? (
                     <div className={styles.audioPlaceholder}>
                       <AudioIcon />
diff --git a/web/src/components/VideoDetailModal.tsx b/web/src/components/VideoDetailModal.tsx
index 249a9ad..2aec229 100644
--- a/web/src/components/VideoDetailModal.tsx
+++ b/web/src/components/VideoDetailModal.tsx
@@ -6,7 +6,7 @@ import { ConfirmModal } from './ConfirmModal';
 import { ImageLightbox } from './ImageLightbox';
 import { useInputBarStore } from '../store/inputBar';
 import { renderPromptWithMentions } from './GenerationCard';
-import { tosThumb } from '../lib/api';
+import { tosThumb, rewriteTosUrl } from '../lib/api';
 import styles from './VideoDetailModal.module.css';
 
 interface Props {
@@ -301,7 +301,7 @@ export function VideoDetailModal({ task, onClose, onReEdit, onRegenerate, onDele
           >
             <video
               ref={videoRef}
-              src={task.resultUrl}
+              src={rewriteTosUrl(task.resultUrl)}
               className={styles.video}
               onTimeUpdate={handleTimeUpdate}
               onLoadedMetadata={handleLoadedMetadata}
@@ -486,7 +486,7 @@ export function VideoDetailModal({ task, onClose, onReEdit, onRegenerate, onDele
                     <div key={ref.id} className={styles.refItem}>
                       <div style={{ position: 'relative', width: 56, height: 56 }}>
                         {ref.type === 'video' ? (
-                          <video src={ref.previewUrl} className={styles.refImg} muted style={{ cursor: 'pointer' }} onClick={() => ref.previewUrl && setRefMediaPreview({ url: ref.previewUrl, type: 'video' })} />
+                          <video src={rewriteTosUrl(ref.previewUrl)} className={styles.refImg} muted style={{ cursor: 'pointer' }} onClick={() => ref.previewUrl && setRefMediaPreview({ url: ref.previewUrl, type: 'video' })} />
                         ) : ref.type === 'audio' ? (
                           <div className={styles.refAudioPlaceholder} style={{ cursor: 'pointer' }} onClick={() => ref.previewUrl && setRefMediaPreview({ url: ref.previewUrl, type: 'audio' })}>
                             <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
@@ -569,11 +569,11 @@ export function VideoDetailModal({ task, onClose, onReEdit, onRegenerate, onDele
             <div style={{ position: 'relative', background: '#111118', borderRadius: 12, padding: 24, border: '1px solid #2a2a38' }} onClick={(e) => e.stopPropagation()}>
               <button style={{ position: 'absolute', top: 8, right: 12, background: 'none', border: 'none', color: '#888', fontSize: 16, cursor: 'pointer' }} onClick={() => setRefMediaPreview(null)}>✕</button>
               {refMediaPreview.type === 'video' ? (
-                <video src={refMediaPreview.url} controls autoPlay style={{ maxWidth: '80vw', maxHeight: '70vh', borderRadius: 8 }} />
+                <video src={rewriteTosUrl(refMediaPreview.url)} controls autoPlay style={{ maxWidth: '80vw', maxHeight: '70vh', borderRadius: 8 }} />
               ) : (
                 <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'center', padding: '20px 40px', color: '#888' }}>
                   <div style={{ fontSize: 48, marginBottom: 16 }}>♫</div>
-                  <audio src={refMediaPreview.url} controls autoPlay style={{ width: 320 }} />
+                  <audio src={rewriteTosUrl(refMediaPreview.url)} controls autoPlay style={{ width: 320 }} />
                 </div>
               )}
             </div>
diff --git a/web/src/lib/api.ts b/web/src/lib/api.ts
index d9d52b7..4a65460 100644
--- a/web/src/lib/api.ts
+++ b/web/src/lib/api.ts
@@ -434,6 +434,20 @@ export const assetsApi = {
     api.get<{ id: number; status: string; url: string; error_message: string }>(`/assets/${id}/status`),
 };
 
+const TOS_ORIGIN = 'https://airdrama-media.tos-cn-beijing.volces.com';
+const PREVIEW_ORIGIN = 'https://airflow-play.airlabs.art';
+
+/**
+ * 把 TOS 直连域名换成 CDN 预览域名，仅用于 <video>/<audio>/<img> 等浏览器拉流场景。
+ * 下载（fetch / a.href download）继续使用原 TOS 域名以避免 CDN CORS 配置依赖。
+ * 非我们桶 / blob: / 已是预览域名 → 原样返回。
+ */
+export function rewriteTosUrl(url: string | undefined): string {
+  if (!url) return '';
+  if (!url.startsWith(TOS_ORIGIN)) return url;
+  return PREVIEW_ORIGIN + url.slice(TOS_ORIGIN.length);
+}
+
 /**
  * Append TOS image resize parameter to reduce loading size.
  * Only applies to TOS image URLs (volces.com with image extensions).
@@ -443,8 +457,9 @@ export function tosThumb(url: string | undefined, height: number): string {
   // 只对我们自己的 TOS 桶生效（airdrama-media），不处理火山内部桶（ark-media-asset 等）
   if (!url.includes('airdrama-media')) return url;
   if (!/\.(png|jpg|jpeg|webp|gif)/i.test(url)) return url;
-  const sep = url.includes('?') ? '&' : '?';
-  return `${url}${sep}x-tos-process=image/resize,h_${height}`;
+  const rewritten = rewriteTosUrl(url);
+  const sep = rewritten.includes('?') ? '&' : '?';
+  return `${rewritten}${sep}x-tos-process=image/resize,h_${height}`;
 }
 
 export default api;
diff --git a/web/src/pages/AdminAssetsPage.tsx b/web/src/pages/AdminAssetsPage.tsx
index 5574be3..6b73d58 100644
--- a/web/src/pages/AdminAssetsPage.tsx
+++ b/web/src/pages/AdminAssetsPage.tsx
@@ -1,5 +1,5 @@
 import { useEffect, useState, useRef, useCallback } from 'react';
-import { adminApi } from '../lib/api';
+import { adminApi, rewriteTosUrl } from '../lib/api';
 import { VideoDetailModal } from '../components/VideoDetailModal';
 import type { AssetTeamSummary, AssetMemberSummary, AssetVideo, GenerationTask } from '../types';
 import styles from './AdminAssetsPage.module.css';
@@ -21,7 +21,7 @@ function VideoThumbnail({ video, onClick }: { video: AssetVideo; onClick: () =>
       onClick={onClick}
     >
       {video.result_url ? (
-        <video ref={videoRef} src={video.result_url} className={styles.thumbVideo} muted loop preload="metadata" />
+        <video ref={videoRef} src={rewriteTosUrl(video.result_url)} className={styles.thumbVideo} muted loop preload="metadata" />
       ) : (
         <div className={styles.thumbPlaceholder} />
       )}
diff --git a/web/src/pages/AssetsPage.tsx b/web/src/pages/AssetsPage.tsx
index d1c3759..7638863 100644
--- a/web/src/pages/AssetsPage.tsx
+++ b/web/src/pages/AssetsPage.tsx
@@ -2,6 +2,7 @@ import { useEffect, useState, useRef, useMemo, useCallback } from 'react';
 import { Sidebar } from '../components/Sidebar';
 import { VideoDetailModal } from '../components/VideoDetailModal';
 import { useGenerationStore } from '../store/generation';
+import { rewriteTosUrl } from '../lib/api';
 import { ConfirmModal } from '../components/ConfirmModal';
 import type { GenerationTask } from '../types';
 import styles from './AssetsPage.module.css';
@@ -70,7 +71,7 @@ function VideoThumbnail({
       {task.resultUrl ? (
         <video
           ref={videoRef}
-          src={task.resultUrl}
+          src={rewriteTosUrl(task.resultUrl)}
           className={styles.thumbVideo}
           muted
           loop
diff --git a/web/src/pages/TeamAssetsPage.tsx b/web/src/pages/TeamAssetsPage.tsx
index 5560c71..ca6e1cb 100644
--- a/web/src/pages/TeamAssetsPage.tsx
+++ b/web/src/pages/TeamAssetsPage.tsx
@@ -1,5 +1,5 @@
 import { useEffect, useState, useRef, useCallback } from 'react';
-import { teamApi } from '../lib/api';
+import { teamApi, rewriteTosUrl } from '../lib/api';
 import { VideoDetailModal } from '../components/VideoDetailModal';
 import type { AssetMemberSummary, AssetVideo, GenerationTask } from '../types';
 import styles from './AdminAssetsPage.module.css';
@@ -21,7 +21,7 @@ function VideoThumbnail({ video, onClick }: { video: AssetVideo; onClick: () =>
       onClick={onClick}
     >
       {video.result_url ? (
-        <video ref={videoRef} src={video.result_url} className={styles.thumbVideo} muted loop preload="metadata" />
+        <video ref={videoRef} src={rewriteTosUrl(video.result_url)} className={styles.thumbVideo} muted loop preload="metadata" />
       ) : (
         <div className={styles.thumbPlaceholder} />
       )}