diff --git a/apps/api/app/services/edit_plan_service.py b/apps/api/app/services/edit_plan_service.py
index 3026c58cf..195d6321b 100755
--- a/apps/api/app/services/edit_plan_service.py
+++ b/apps/api/app/services/edit_plan_service.py
@@ -585,10 +585,18 @@ class EditPlanService:
         if not clips:
             return False, "请先添加片段后再生成视频"
 
+        # 检查是否至少有一个片段分配了素材
+        if not any(c.asset_id for c in clips):
+            return False, "没有可渲染的就绪片段，请确保已选择素材"
+
         return True, ""
 
     def mark_clips_ready(self, plan_id: str) -> int:
-        """将所有 pending 状态的片段标记为 ready
+        """将已分配素材的 pending 片段标记为 ready
+
+        只标记同时满足以下条件的片段：
+        - status == PENDING
+        - asset_id 非空（已分配素材）
 
         Returns:
             int: 标记的片段数量
@@ -599,10 +607,16 @@ class EditPlanService:
         )
         count = 0
         for clip in clips:
-            clip.mark_ready()
-            self._clip_repo.update(clip)
-            count += 1
-        logger.info("标记片段就绪: plan_id=%s count=%d", plan_id, count)
+            if clip.asset_id:
+                clip.mark_ready()
+                self._clip_repo.update(clip)
+                count += 1
+        logger.info(
+            "标记片段就绪: plan_id=%s marked=%d total_pending=%d",
+            plan_id,
+            count,
+            len(clips),
+        )
         return count
 
     def update_plan_config(self, plan_id: str, config_updates: Dict[str, Any]) -> EditPlan:
diff --git a/apps/web/src/pages/generate/hooks/generate-video/buildPayload.ts b/apps/web/src/pages/generate/hooks/generate-video/buildPayload.ts
index ced8ec345..e7f39ece8 100644
--- a/apps/web/src/pages/generate/hooks/generate-video/buildPayload.ts
+++ b/apps/web/src/pages/generate/hooks/generate-video/buildPayload.ts
@@ -61,14 +61,23 @@ export const buildEditPlanPayload = (props: UseGenerateVideoProps) => {
  * 返回错误信息，通过则返回 null
  */
 export const validateGenerateInputs = (props: UseGenerateVideoProps): string | null => {
-  const { titleSettings, materialMode, selectedMaterials, voiceMode, selectedClonedVoice } = props
+  const {
+    titleSettings,
+    materialMode,
+    selectedMaterials,
+    smartSelectedIds,
+    voiceMode,
+    selectedClonedVoice,
+  } = props
 
   // AI 自动选择模式下，标题可以为空（后端会自行生成）
   if (!titleSettings.aiAutoSelect && !titleSettings.title?.trim()) {
     return "请先选择或输入标题"
   }
-  if (materialMode === "manual" && selectedMaterials.length === 0) {
-    return "请至少选择一个素材"
+  // 无论手动还是自动模式，都必须有素材
+  const materialIds = materialMode === "auto" ? smartSelectedIds || [] : selectedMaterials || []
+  if (materialIds.length === 0) {
+    return materialMode === "auto" ? "AI 未匹配到素材，请手动选择素材后重试" : "请至少选择一个素材"
   }
   if (voiceMode === "clone" && !selectedClonedVoice) {
     return "请先选择一个克隆音色"
diff --git a/tests/unit/test_edit_plan_service.py b/tests/unit/test_edit_plan_service.py
index 806f3de61..b79bf5d18 100755
--- a/tests/unit/test_edit_plan_service.py
+++ b/tests/unit/test_edit_plan_service.py
@@ -501,11 +501,22 @@ class TestGenerationWorkflow:
         svc = _make_service()
         p = svc.create_plan("tpl-001", "测试")
         svc.transition_status(p.id, EditPlanStatus.EDITING)
-        svc.create_clip(p.id, "intro", 0)
+        clip = svc.create_clip(p.id, "intro", 0)
+        svc.assign_asset(clip.id, "asset-001")
         can, reason = svc.can_generate(p.id)
         assert can is True
         assert reason == ""
 
+    def test_can_generate_no_assets_fails(self):
+        """片段存在但没有分配素材时，can_generate 应返回 False"""
+        svc = _make_service()
+        p = svc.create_plan("tpl-001", "测试")
+        svc.transition_status(p.id, EditPlanStatus.EDITING)
+        svc.create_clip(p.id, "intro", 0)
+        can, reason = svc.can_generate(p.id)
+        assert can is False
+        assert "没有可渲染" in reason or "素材" in reason
+
     def test_can_generate_draft_fails(self):
         svc = _make_service()
         p = svc.create_plan("tpl-001", "测试")
@@ -523,23 +534,20 @@ class TestGenerationWorkflow:
         assert "请先添加片段后再生成视频" in reason
 
     def test_mark_clips_ready(self):
+        """只有分配了素材的 pending 片段才会被标记为 ready"""
         svc = _make_service()
         p = svc.create_plan("tpl-001", "测试")
-        svc.create_clip(p.id, "intro", 0)
-        svc.create_clip(p.id, "main", 1)
+        clip1 = svc.create_clip(p.id, "intro", 0)
+        clip2 = svc.create_clip(p.id, "main", 1)
+        # 只给 clip1 分配素材
+        svc.assign_asset(clip1.id, "asset-001")
         count = svc.mark_clips_ready(p.id)
-        assert count == 2
-        # 验证所有片段都是 ready 状态
+        assert count == 1  # 只有 clip1 被标记
+        # 验证 clip1 是 ready，clip2 仍是 pending
         clips = svc.list_clips(p.id)
-        for c in clips:
-            assert c.status == EditPlanClipStatus.READY
-        svc = _make_service()
-        p = svc.create_plan("tpl-001", "测试")
-        svc.create_clip(p.id, "intro", 0)
-        result = svc.get_generation_status(p.id)
-        assert result["plan"].id == p.id
-        assert len(result["clips"]) == 1
-        assert result["generation_task_id"] is None
+        clips_by_order = {c.order: c for c in clips}
+        assert clips_by_order[0].status == EditPlanClipStatus.READY
+        assert clips_by_order[1].status == EditPlanClipStatus.PENDING
 
     def test_update_plan_config(self):
         svc = _make_service()
@@ -613,7 +621,8 @@ class TestResumeEditingAndRegenerate:
         """完成后编辑 → can_generate 返回 True，可再生成"""
         svc = _make_service()
         p = svc.create_plan("tpl-001", "测试")
-        svc.create_clip(p.id, "main", 0)
+        clip = svc.create_clip(p.id, "main", 0)
+        svc.assign_asset(clip.id, "asset-001")
         svc.transition_status(p.id, EditPlanStatus.EDITING)
         svc.transition_status(p.id, EditPlanStatus.RENDERING)
         svc.transition_status(p.id, EditPlanStatus.COMPLETED)