diff --git a/web/.env.example b/web/.env.example
index eac2d5e..0159f0c 100644
--- a/web/.env.example
+++ b/web/.env.example
@@ -5,3 +5,4 @@ VITE_APP_DOMAIN=https://yuheng.yuxindazhineng.com
 VITE_API_BASE=
 # 可选：与 Mongo 站点 _id 一致；静态 /promotion 缺文件时用于 promotion-media 回退（见 promotionVideos.js）
 # VITE_DEFAULT_SITE_ID=69ba1f1f41aeb82acfd609ef
+# 仅走 API、跳过静态探测（无 Network 404 噪音）：VITE_PROMOTION_API_ONLY=true
diff --git a/web/.env.production b/web/.env.production
index 0e3791b..4ff37b2 100644
--- a/web/.env.production
+++ b/web/.env.production
@@ -6,3 +6,4 @@ VITE_APP_DOMAIN=https://yuheng.yuxindazhineng.com
 VITE_API_BASE=
 # 可选：填官网 Mongo site_id，静态 /promotion 无视频时强制走 promotion-media 回退
 # VITE_DEFAULT_SITE_ID=
+# 素材只在上传目录、不想探测静态时：VITE_PROMOTION_API_ONLY=true
diff --git a/web/promotion/social/README.md b/web/promotion/social/README.md
index 847f0f9..bd74c6c 100644
--- a/web/promotion/social/README.md
+++ b/web/promotion/social/README.md
@@ -24,6 +24,8 @@
 线上访问示例：`https://你的域名/promotion/social/douyin.png`  
 （须将 `web/promotion` 同步到 **`deploy/web/dist/promotion`**，见 `pull-and-restart.sh`。）
 
+首页产品视频：只对**第一条**的封面与视频各探测一次静态；若任一不存在则**全部**走 `promotion-media` API（避免 Network 里 10+ 条 404）。若素材**只在上传目录**，可在 `web/.env.production` 设 **`VITE_PROMOTION_API_ONLY=true`** 并配合 **`VITE_DEFAULT_SITE_ID`**，不再发静态探测请求。
+
 ## 从旧「视频发布」目录迁移
 
 **仅同步到源码 `social/`（给静态站用）：**
diff --git a/web/src/data/promotionVideos.js b/web/src/data/promotionVideos.js
index 9a1e51e..c1538c6 100644
--- a/web/src/data/promotionVideos.js
+++ b/web/src/data/promotionVideos.js
@@ -87,16 +87,23 @@ export async function promotionStaticUrlExists(url) {
   }
 }
 
+const apiOnly =
+  import.meta.env.VITE_PROMOTION_API_ONLY === '1' ||
+  import.meta.env.VITE_PROMOTION_API_ONLY === 'true'
+
 /**
- * 有静态则静态，否则（需 siteId）走 promotion-media API
+ * 有静态则静态，否则（需 siteId）走 promotion-media API（单资源；列表请用 buildPromotionVideosAsync 批量逻辑）
  * @param {string} siteId
  * @param {string} relPath promotion 下相对路径，如 social/xxx.mov
  */
 export async function pickPromotionAssetUrl(siteId, relPath) {
+  const sid = String(siteId || defaultWebSiteId || '').trim()
+  if (apiOnly && sid) {
+    return promotionMediaApiUrl(sid, relPath)
+  }
   const staticUrl = promotionUrl(relPath)
   const hasStatic = await promotionStaticUrlExists(staticUrl)
   if (hasStatic) return staticUrl
-  const sid = String(siteId || defaultWebSiteId || '').trim()
   if (sid) return promotionMediaApiUrl(sid, relPath)
   return staticUrl
 }
@@ -116,20 +123,52 @@ export function buildPromotionVideos(_siteId) {
 }
 
 /**
- * 静态优先：存在 /promotion/... 则用静态，否则用 uploads API（需 siteId）
+ * 静态优先：只对「示例封面 + 示例视频」各探测一次，避免 Network 里出现 10+ 条 404。
+ * 二者在静态均存在则全套走 /promotion/；否则有 siteId 时全套走 promotion-media API。
  * @param {string} siteId
  */
 export async function buildPromotionVideosAsync(siteId) {
-  const id = siteId || ''
-  return Promise.all(
-    PROMOTION_VIDEOS_BASE.map(async (v) => {
-      const [cover, src] = await Promise.all([
-        pickPromotionAssetUrl(id, v.relCover),
-        pickPromotionAssetUrl(id, v.relVideo)
-      ])
-      return { id: v.id, title: v.title, desc: v.desc, cover, src }
-    })
-  )
+  const id = String(siteId || defaultWebSiteId || '').trim()
+  const first = PROMOTION_VIDEOS_BASE[0]
+
+  let useStatic = false
+  if (apiOnly && id) {
+    useStatic = false
+  } else if (!apiOnly) {
+    const [coverOk, videoOk] = await Promise.all([
+      promotionStaticUrlExists(promotionUrl(first.relCover)),
+      promotionStaticUrlExists(promotionUrl(first.relVideo))
+    ])
+    useStatic = coverOk && videoOk
+  }
+
+  return PROMOTION_VIDEOS_BASE.map((v) => {
+    if (useStatic) {
+      return {
+        id: v.id,
+        title: v.title,
+        desc: v.desc,
+        cover: promotionUrl(v.relCover),
+        src: promotionUrl(v.relVideo)
+      }
+    }
+    if (id) {
+      return {
+        id: v.id,
+        title: v.title,
+        desc: v.desc,
+        cover: promotionMediaApiUrl(id, v.relCover),
+        src: promotionMediaApiUrl(id, v.relVideo)
+      }
+    }
+    return {
+      id: v.id,
+      title: v.title,
+      desc: v.desc,
+      cover: promotionUrl(v.relCover),
+      src: promotionUrl(v.relVideo)
+    }
+  })
 }
 
 /** @deprecated 请用 buildPromotionVideos() 或 buildPromotionVideosAsync */