diff --git a/frontend-web/src/open-canvas/components/ai-writing/AIWritingForm.tsx b/frontend-web/src/open-canvas/components/ai-writing/AIWritingForm.tsx
index 7f9db889..9d5eb192 100644
--- a/frontend-web/src/open-canvas/components/ai-writing/AIWritingForm.tsx
+++ b/frontend-web/src/open-canvas/components/ai-writing/AIWritingForm.tsx
@@ -29,8 +29,15 @@ const INPUT_CLASS =
 
 const DEFAULT_KEYWORD_COUNT = 1;
 const DEFAULT_AUDIENCE = '普通读者';
+const DEFAULT_MATERIAL_SOURCE: 'knowledge_base' | 'skill' = 'knowledge_base';
 const MAX_INTENT_LENGTH = 500;
 
+// 素材来源选项：知识库=素材专家默认 web/intranet 检索；技能检索=用技能编排去检索
+const MATERIAL_SOURCE_OPTIONS: Array<{ value: 'knowledge_base' | 'skill'; label: string }> = [
+  { value: 'knowledge_base', label: '知识库' },
+  { value: 'skill', label: '技能检索' },
+];
+
 const FIELD_LABEL_CLASS = 'text-[16px] font-semibold leading-none text-[#222]';
 const FIELD_TRIGGER_CLASS =
   'h-12 w-full rounded-xl border-[#e8dedd] bg-white text-sm shadow-sm';
@@ -45,6 +52,8 @@ export function AIWritingForm({
   const [audience, setAudience] = useState('普通读者');
   const [wordCountInput, setWordCountInput] = useState('800');
   const [strictMode, setStrictMode] = useState(false);
+  const [materialSource, setMaterialSource] =
+    useState<'knowledge_base' | 'skill'>(DEFAULT_MATERIAL_SOURCE);
   const [modelName, setModelName] = useState('');
   const { models, isLoading: modelsLoading } = useModels();
 
@@ -111,6 +120,7 @@ export function AIWritingForm({
       wordCountTarget: wordCount,
       keywordCount: DEFAULT_KEYWORD_COUNT,
       writingMode: hideAdvancedFields ? 'loose' : strictMode ? 'strict' : 'loose',
+      materialSource,
       modelName: selectedModel?.name || modelName || undefined,
     });
   }
@@ -178,6 +188,29 @@ export function AIWritingForm({
           </div>
         </div>
 
+        <div className="mt-4 space-y-2">
+          <label className={FIELD_LABEL_CLASS}>素材来源</label>
+          <Select
+            value={materialSource}
+            onValueChange={(v) => setMaterialSource(v as 'knowledge_base' | 'skill')}
+            disabled={disabled}
+          >
+            <SelectTrigger className={FIELD_TRIGGER_CLASS}>
+              <SelectValue placeholder="选择素材来源" />
+            </SelectTrigger>
+            <SelectContent>
+              {MATERIAL_SOURCE_OPTIONS.map((opt) => (
+                <SelectItem key={opt.value} value={opt.value} className="text-sm">
+                  {opt.label}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+          <p className="text-xs leading-relaxed text-muted-foreground/80">
+            知识库：素材专家默认检索方式；技能检索：用已启用的技能去编排检索。
+          </p>
+        </div>
+
         <div className="mt-4 space-y-2">
           <label className={FIELD_LABEL_CLASS}>写作模型</label>
           <Select
diff --git a/frontend-web/src/open-canvas/hooks/useAIWritingStream.ts b/frontend-web/src/open-canvas/hooks/useAIWritingStream.ts
index 21d31bca..af30a2c7 100644
--- a/frontend-web/src/open-canvas/hooks/useAIWritingStream.ts
+++ b/frontend-web/src/open-canvas/hooks/useAIWritingStream.ts
@@ -747,6 +747,7 @@ export function useAIWriting() {
           word_count_target: request.wordCountTarget,
           keyword_count: Math.max(1, Math.min(10, request.keywordCount)),
           writing_mode: request.writingMode === 'strict' ? 'strict' : 'loose',
+          material_source: request.materialSource === 'skill' ? 'skill' : 'knowledge_base',
           revision_count: 0,
           max_revisions: 3,
           status: 'researching',
diff --git a/frontend-web/src/open-canvas/types/ai-writing.ts b/frontend-web/src/open-canvas/types/ai-writing.ts
index 98d6a380..3d48aaec 100644
--- a/frontend-web/src/open-canvas/types/ai-writing.ts
+++ b/frontend-web/src/open-canvas/types/ai-writing.ts
@@ -228,6 +228,8 @@ export interface AIWritingRequest {
   keywordCount: number;
   /** 写作模式：strict=严格依据素材 / loose=可结合通用知识（默认 loose） */
   writingMode: 'strict' | 'loose';
+  /** 素材来源：knowledge_base=知识库（默认检索）/ skill=技能检索（默认 knowledge_base） */
+  materialSource: 'knowledge_base' | 'skill';
 }
 
 // ── 流式审核条目 ──────────────────────────────────────────────────────────────
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/nodes/researcher.py b/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/nodes/researcher.py
index 711ae85f..227735e8 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/nodes/researcher.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/nodes/researcher.py
@@ -116,11 +116,19 @@ async def researcher_node(state: AIWritingState, config: RunnableConfig) -> dict
     is_user_query_search = action == "re_search" and bool(user_query)
     # 兼容旧版"追加关键词"调用方（如果还有 client 传 extra_keywords 数组而非 user_query）
     is_append_only = action == "re_search" and not user_query and bool(extra_keywords)
-    # PAUSE-1 素材确认卡用户点「启用技能检索」：
+    # 用户在写作表单选择的素材来源：knowledge_base（默认 web/intranet 检索）/ skill（技能检索）。
+    # 首次检索（没有用户干预）时按它决定检索方式；缺省 knowledge_base。
+    material_source = (state.get("material_source") or "knowledge_base").strip()
+    is_first_run = not intervention
+    is_initial_skill_source = is_first_run and material_source == "skill"
+    # 技能检索触发条件（任一即可）：
+    #   - 首次检索且表单选了「技能检索」来源
+    #   - PAUSE-1 素材确认卡用户点「启用技能检索」按钮
+    # 技能检索流程：
     #   - 不再走 web/intranet 检索，改用 SkillSearchProvider
     #   - 顺序调用候选技能 + 早停（第一个技能够就停，不够再加下一个）
     #   - 旧 material_package 完全丢弃（覆盖式替换，让用户对比 web vs skill 结果）
-    is_skill_search = action == "enable_skill_search"
+    is_skill_search = action == "enable_skill_search" or is_initial_skill_source
 
     # 用户指定的检索关键词数量（1~10），决定生成多少个检索词、检索多少个方向
     keyword_count = _resolve_keyword_count(state.get("keyword_count"))
diff --git a/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/state.py b/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/state.py
index 90074818..f8bfec66 100644
--- a/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/state.py
+++ b/offline-backend-20260512/backend/packages/harness/deerflow/agents/ai_writing/state.py
@@ -132,6 +132,9 @@ class AIWritingState(TypedDict):
     keyword_count: int
     # 写作模式：strict=严格依据素材 / loose=可结合通用知识（默认 loose）
     writing_mode: str
+    # 素材来源：knowledge_base=知识库（默认 web/intranet 检索）/ skill=技能检索。
+    # 用户在写作表单选择，首次检索时由 researcher 节点据此决定检索方式（缺省 knowledge_base）。
+    material_source: str
     # 用户在写作表单选定的主模型。大纲/写作/审核严格使用它（不回退默认）。
     # 由 intent_parser 在首次 invocation 从 configurable.model_name 捕获进 state，
     # 经 checkpoint 持久化 —— interrupt/resume 是新 invocation、其 config 不带原