diff --git a/core/backend/apps/projects/views.py b/core/backend/apps/projects/views.py
index c51bfff..facf643 100644
--- a/core/backend/apps/projects/views.py
+++ b/core/backend/apps/projects/views.py
@@ -231,6 +231,36 @@ class ProjectViewSet(TeamScopedViewSetMixin, ModelViewSet):
         # 列表用轻量序列化(只给列表/仪表盘/侧栏要的字段);详情/写操作用全量 ProjectSerializer
         return ProjectListSerializer if self.action == "list" else ProjectSerializer
 
+    def _seed_product_triview_group(self, *, project_id, product_id, team):
+        """惰性把商品库已有的商品三视图挂进本项目的商品 BaseAssetGroup(幂等)。
+        商品库走 standalone Asset、视频项目走项目级 BaseAssetGroup,是两套存储;此处做单向复用同步:
+        进详情时若商品已有 standalone 三视图(metadata.view=three_view + product_id)但项目商品组尚无采用资产,
+        就 seed 进去 → 第二步基础资产直接显示该三视图,不再「缺三视图」。已在项目内生成过的不覆盖。"""
+        if not product_id:
+            return
+        groups = [
+            g for g in BaseAssetGroup.objects.filter(project_id=project_id, kind=BaseAssetGroup.Kind.PRODUCT)
+            if not (g.metadata or {}).get("triview_of")
+        ]
+        if any(g.adopted_asset_id for g in groups):
+            return  # 项目内已有商品三视图,不覆盖
+        tri = (
+            Asset.objects.filter(
+                team=team, is_deleted=False,
+                metadata__product_id=str(product_id), metadata__view="three_view",
+            )
+            .order_by("-created_at")
+            .first()
+        )
+        if tri is None:
+            return
+        group = groups[0] if groups else BaseAssetGroup.objects.create(
+            project_id=project_id, kind=BaseAssetGroup.Kind.PRODUCT, metadata={}
+        )
+        group.candidate_assets.add(tri)
+        group.adopted_asset = tri
+        group.save(update_fields=["adopted_asset", "updated_at"])
+
     def retrieve(self, request, *args, **kwargs):
         # 详情加载(=进入流水线页)时自愈视频片段数:历史项目在「采用前增删分镜」未同步,
         # 或项目创建固定铺的 4 段从未被收口,会让视频步骤的片段数与故事板/采用版分镜对不上。
@@ -238,10 +268,13 @@ class ProjectViewSet(TeamScopedViewSetMixin, ModelViewSet):
         # 用轻量查询判定 + 同步,再交给 super 做重 prefetch 序列化(避免重查询跑两遍)。
         proj = (
             Project.objects.filter(pk=kwargs.get("pk"), **{self.team_field: self.get_team()})
-            .only("id", "current_stage", "status")
+            .only("id", "current_stage", "status", "product_id")
             .first()
         )
         if proj is not None:
+            # 跨库同步:商品在「商品库」生成过三视图(standalone Asset, view=three_view + product_id),
+            # 但本项目还没商品三视图组 → seed 进项目商品组,让第二步「基础资产」复用、不再「缺三视图」。
+            self._seed_product_triview_group(project_id=proj.id, product_id=proj.product_id, team=self.get_team())
             if proj.current_stage == ProjectStage.Stage.VIDEO:
                 adopted_script = proj.script_versions.filter(is_adopted=True).order_by("-created_at").first()
                 if adopted_script is not None: