diff --git a/apps/api/app/api/routes/templates_editor/clips.py b/apps/api/app/api/routes/templates_editor/clips.py
index 515e3eaa4..4343481a1 100755
--- a/apps/api/app/api/routes/templates_editor/clips.py
+++ b/apps/api/app/api/routes/templates_editor/clips.py
@@ -445,6 +445,8 @@ def create_clips_from_assets_editor(
         current_user.user.id,
     )
 
+    # 新创建的片段已分配素材，立即标记为 ready，否则渲染管线找不到就绪片段
+    plan_svc.mark_clips_ready(plan_id)
     return ClipsFromAssetsResponse(
         created_count=len(clips),
         plan_id=plan_id,
diff --git a/tests/unit/test_editor_clips_random_start.py b/tests/unit/test_editor_clips_random_start.py
index e2336ef72..fe782562d 100644
--- a/tests/unit/test_editor_clips_random_start.py
+++ b/tests/unit/test_editor_clips_random_start.py
@@ -394,3 +394,30 @@ class TestEditorClipsErrorHandling:
 
         assert exc_info.value.status_code == 400
         assert "创建片段失败" in exc_info.value.detail
+
+
+class TestMarkClipsReadyAfterCreation:
+    """验证 from-assets 创建片段后立即调用 mark_clips_ready，确保渲染管线能找到就绪片段。"""
+
+    @patch("app.api.routes.templates_editor.clips.get_storage_service")
+    def test_mark_clips_ready_called_after_creation(self, _mock_storage):
+        """创建片段后必须调用 plan_svc.mark_clips_ready(plan_id)。"""
+        from app.api.routes.templates_editor.clips import create_clips_from_assets_editor
+        from app.api.routes.templates_editor.schemas import ClipsFromAssetsRequest
+
+        mock_plan_svc = _make_plan_svc()
+        mock_asset_repo = MagicMock()
+        mock_asset_repo.get = MagicMock(side_effect=lambda aid: _make_mock_asset(aid, {"a1": 30.0}[aid]))
+
+        body = ClipsFromAssetsRequest(asset_ids=["a1"], required_clips_count=2)
+        create_clips_from_assets_editor(
+            template_id="tmpl-1",
+            body=body,
+            plan_id="plan-xyz",
+            services=(MagicMock(), mock_plan_svc),
+            asset_repo=mock_asset_repo,
+            current_user=_make_auth_user(),
+        )
+
+        # 关键断言：mark_clips_ready 必须被调用，且传入正确的 plan_id
+        mock_plan_svc.mark_clips_ready.assert_called_once_with("plan-xyz")