diff --git a/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeContentPreview.vue b/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeContentPreview.vue
index 637e039..ba05082 100644
--- a/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeContentPreview.vue
+++ b/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeContentPreview.vue
@@ -6,6 +6,8 @@ import type { KnowledgeVersionContent } from "../types/api";
 
 const props = defineProps<{
   versionId: number | null;
+  targetSectionId?: number | null;
+  highlightKeyword?: string;
 }>();
 
 const loading = ref(false);
@@ -25,6 +27,7 @@ const characterCount = computed(() => (
 ));
 
 watch(() => props.versionId, loadVersion, { immediate: true });
+watch(() => props.targetSectionId, selectTargetSection);
 
 async function loadVersion(versionId: number | null) {
   const sequence = ++requestSequence;
@@ -38,7 +41,9 @@ async function loadVersion(versionId: number | null) {
     const result = await api.knowledgeVersionContent(versionId);
     if (sequence !== requestSequence) return;
     content.value = result;
-    activeSectionId.value = result.sections[0]?.id ?? null;
+    activeSectionId.value = props.targetSectionId && result.sections.some((section) => section.id === props.targetSectionId)
+      ? props.targetSectionId
+      : result.sections[0]?.id ?? null;
   } catch (loadError) {
     if (sequence !== requestSequence) return;
     error.value = loadError instanceof Error ? loadError.message : "知识库内容加载失败";
@@ -47,6 +52,32 @@ async function loadVersion(versionId: number | null) {
   }
 }
 
+function selectTargetSection(sectionId?: number | null) {
+  if (!sectionId || !content.value?.sections.some((section) => section.id === sectionId)) return;
+  activeSectionId.value = sectionId;
+}
+
+function highlightedParts(text: string) {
+  const keyword = (props.highlightKeyword || "").trim();
+  if (!keyword) return [{ text, match: false }];
+  const parts: Array<{ text: string; match: boolean }> = [];
+  const source = text || "";
+  const lowerSource = source.toLowerCase();
+  const lowerKeyword = keyword.toLowerCase();
+  let cursor = 0;
+  while (cursor < source.length) {
+    const index = lowerSource.indexOf(lowerKeyword, cursor);
+    if (index < 0) {
+      parts.push({ text: source.slice(cursor), match: false });
+      break;
+    }
+    if (index > cursor) parts.push({ text: source.slice(cursor, index), match: false });
+    parts.push({ text: source.slice(index, index + keyword.length), match: true });
+    cursor = index + keyword.length;
+  }
+  return parts.length ? parts : [{ text: source, match: false }];
+}
+
 </script>
 
 <template>
@@ -94,7 +125,7 @@ async function loadVersion(versionId: number | null) {
             <div><small>{{ activeSection.sectionKey }}</small><h3>{{ activeSection.title }}</h3></div>
             <span>源内容位置 {{ activeSection.sourceStart }}–{{ activeSection.sourceEnd }}</span>
           </div>
-          <pre>{{ activeSection.content }}</pre>
+          <pre><template v-for="(part, index) in highlightedParts(activeSection.content)" :key="index"><mark v-if="part.match">{{ part.text }}</mark><span v-else>{{ part.text }}</span></template></pre>
         </article>
       </div>
 
@@ -133,6 +164,7 @@ async function loadVersion(versionId: number | null) {
 .content-article-head h3 { margin: 5px 0 0; color: #203b32; font-size: 20px; }
 .content-article-head > span { color: #88958f; font-size: 12px; white-space: nowrap; }
 .content-article pre { margin: 20px 0 0; white-space: pre-wrap; overflow-wrap: anywhere; color: #354840; font: inherit; font-size: 14px; line-height: 1.85; }
+.content-article mark { padding: 0 2px; border-radius: 3px; background: #fff1a8; color: inherit; }
 .content-card-panel { margin-top: 16px; }
 @media (max-width: 900px) {
   .content-preview-toolbar { align-items: stretch; flex-direction: column; }
diff --git a/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeManagementView.vue b/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeManagementView.vue
index 06a670c..5828fd4 100644
--- a/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeManagementView.vue
+++ b/ai_knowledge_base_v2/apps/admin-web/src/components/KnowledgeManagementView.vue
@@ -8,6 +8,7 @@ import TableRowActions from "./TableRowActions.vue";
 import AdminPagination from "./AdminPagination.vue";
 import type {
   KnowledgeDetail,
+  KnowledgeContentSearchItem,
   KnowledgeBatchSyncResult,
   KnowledgeItem,
   KnowledgeSyncJob,
@@ -24,6 +25,8 @@ const detailOpen = ref(false);
 const detail = ref<KnowledgeDetail | null>(null);
 const jobs = ref<KnowledgeSyncJob[]>([]);
 const previewVersionId = ref<number | null>(null);
+const previewTargetSectionId = ref<number | null>(null);
+const previewHighlightKeyword = ref("");
 const activeTab = ref("overview");
 const selectedRows = ref<KnowledgeItem[]>([]);
 const editOpen = ref(false);
@@ -38,6 +41,10 @@ const nodeResolved = ref(false);
 const sourceTitle = ref("");
 const filter = reactive({ keyword: "", type: "", open: "", source: "" });
 const pager = reactive({ page: 1, pageSize: 20, total: 0 });
+const contentSearch = reactive({ keyword: "", includeClosed: true });
+const contentSearchRows = ref<KnowledgeContentSearchItem[]>([]);
+const contentSearchLoading = ref(false);
+const contentSearchPager = reactive({ page: 1, pageSize: 10, total: 0 });
 const form = reactive({
   name: "",
   feishuSpaceId: "",
@@ -178,6 +185,36 @@ async function handleMore(command: string, item: KnowledgeItem) {
   }
 }
 
+async function searchContent(page = contentSearchPager.page, pageSize = contentSearchPager.pageSize) {
+  const keyword = contentSearch.keyword.trim();
+  if (!keyword) {
+    contentSearchRows.value = [];
+    Object.assign(contentSearchPager, { page: 1, pageSize, total: 0 });
+    return ElMessage.warning("请输入要搜索的知识库内容关键字");
+  }
+  contentSearchLoading.value = true;
+  try {
+    const result = await api.knowledgeContentSearch({
+      keyword,
+      includeClosed: contentSearch.includeClosed,
+      page,
+      pageSize,
+    });
+    contentSearchRows.value = result.items;
+    Object.assign(contentSearchPager, { page: result.page, pageSize: result.pageSize, total: result.total });
+  } catch (error) {
+    ElMessage.error(errorMessage(error, "知识库内容搜索失败"));
+  } finally {
+    contentSearchLoading.value = false;
+  }
+}
+
+function clearContentSearch() {
+  contentSearch.keyword = "";
+  contentSearchRows.value = [];
+  Object.assign(contentSearchPager, { page: 1, pageSize: contentSearchPager.pageSize, total: 0 });
+}
+
 async function restore(item: KnowledgeItem) {
   if (!await confirmAction("恢复后知识库仍保持关闭，需要单独确认开放。", "恢复知识库", {
     confirmButtonText: "确认恢复", cancelButtonText: "取消", type: "warning",
@@ -218,11 +255,16 @@ async function resolveNode() {
   } finally { resolvingNode.value = false; }
 }
 
-async function openDetail(item: KnowledgeItem) {
+async function openDetail(
+  item: KnowledgeItem | { id: number },
+  options: { sectionId?: number | null; keyword?: string; tab?: string } = {},
+) {
   detailOpen.value = true;
   detail.value = null;
-  activeTab.value = "overview";
+  activeTab.value = options.tab || "overview";
   previewVersionId.value = null;
+  previewTargetSectionId.value = options.sectionId ?? null;
+  previewHighlightKeyword.value = options.keyword || "";
   try {
     const refreshedDetail = await refreshDetail(item.id);
     previewVersionId.value = refreshedDetail.currentVersion?.id ?? null;
@@ -232,6 +274,13 @@ async function openDetail(item: KnowledgeItem) {
   }
 }
 
+async function openSearchHit(item: KnowledgeContentSearchItem) {
+  await openDetail(
+    { id: item.knowledgeId },
+    { sectionId: item.sectionId, keyword: contentSearch.keyword.trim(), tab: "content" },
+  );
+}
+
 async function refreshDetail(id: number) {
   const [nextDetail, nextJobs] = await Promise.all([
     api.knowledgeDetail(id), api.knowledgeSyncJobs(id),
@@ -330,6 +379,36 @@ function typeLabel(value: string) {
   return knowledgeTypeOptions.find((item) => item.value === value)?.label || value;
 }
 
+function contentItemTypeLabel(value: string) {
+  return ({ section: "章节", card: "知识卡", chunk: "切片" } as Record<string, string>)[value] || value;
+}
+
+function matchedLabel(values: string[]) {
+  const labels = values.map((value) => ({ title: "标题", content: "正文" } as Record<string, string>)[value] || value);
+  return labels.join("、");
+}
+
+function highlightSnippet(text: string) {
+  const keyword = contentSearch.keyword.trim();
+  if (!keyword) return [{ text, match: false }];
+  const parts: Array<{ text: string; match: boolean }> = [];
+  const source = text || "";
+  const lowerSource = source.toLowerCase();
+  const lowerKeyword = keyword.toLowerCase();
+  let cursor = 0;
+  while (cursor < source.length) {
+    const index = lowerSource.indexOf(lowerKeyword, cursor);
+    if (index < 0) {
+      parts.push({ text: source.slice(cursor), match: false });
+      break;
+    }
+    if (index > cursor) parts.push({ text: source.slice(cursor, index), match: false });
+    parts.push({ text: source.slice(index, index + keyword.length), match: true });
+    cursor = index + keyword.length;
+  }
+  return parts.length ? parts : [{ text: source, match: false }];
+}
+
 function errorMessage(error: unknown, fallback: string) {
   return error instanceof Error ? error.message : fallback;
 }
@@ -380,6 +459,58 @@ async function confirmAction(
     </div>
   </section>
 
+  <section class="knowledge-content-search-panel">
+    <div class="content-search-head">
+      <div>
+        <h3>搜索知识库内容</h3>
+        <p>跨全部当前最新版搜索章节、知识卡和切片，用于确认内容是否已同步进检索链路。</p>
+      </div>
+      <el-switch v-model="contentSearch.includeClosed" active-text="包含已关闭" inactive-text="仅开放" />
+    </div>
+    <div class="content-search-row">
+      <el-input
+        v-model="contentSearch.keyword"
+        placeholder="输入内容关键字，例如：静水流深静心、合一作业、会议链接"
+        clearable
+        @clear="clearContentSearch"
+        @keydown.enter.exact.prevent="searchContent(1)"
+      />
+      <el-button type="primary" :loading="contentSearchLoading" @click="searchContent(1)">搜索内容</el-button>
+    </div>
+    <div v-if="contentSearchPager.total || contentSearchRows.length" v-loading="contentSearchLoading" class="content-search-results">
+      <div class="content-search-result-summary">
+        找到 {{ contentSearchPager.total }} 条命中
+        <span>结果只来自当前最新版；已关闭知识库会标记为不可被用户端默认召回。</span>
+      </div>
+      <article v-for="item in contentSearchRows" :key="`${item.itemType}-${item.itemId}`" class="content-search-hit">
+        <div class="content-search-hit-main">
+          <div class="content-search-hit-title">
+            <strong>{{ item.title }}</strong>
+            <el-tag size="small" effect="plain">{{ contentItemTypeLabel(item.itemType) }}</el-tag>
+            <el-tag size="small" :type="item.canAgentUse ? 'success' : 'warning'">{{ item.canAgentUse ? '可参与召回' : '不可默认召回' }}</el-tag>
+          </div>
+          <p class="content-search-hit-meta">
+            {{ item.knowledgeName }} · V{{ item.versionNo }} · {{ item.sectionKey }} · 命中{{ matchedLabel(item.matchedIn) }}
+          </p>
+          <p class="content-search-hit-snippet">
+            <template v-for="(part, index) in highlightSnippet(item.snippet)" :key="index">
+              <mark v-if="part.match">{{ part.text }}</mark><span v-else>{{ part.text }}</span>
+            </template>
+          </p>
+          <div class="content-search-diagnostics">
+            <span>{{ item.knowledgeStatus === 1 ? '已开放' : '已关闭' }}</span>
+            <span>{{ item.sourceStatus === 'normal' ? '源正常' : '源异常' }}</span>
+            <span>{{ item.hasChunks ? '已生成切片' : '未生成切片' }}</span>
+            <span>{{ item.isCurrentVersion ? '当前版本' : '非当前版本' }}</span>
+          </div>
+        </div>
+        <el-button type="primary" plain @click="openSearchHit(item)">查看内容</el-button>
+      </article>
+      <AdminPagination :page="contentSearchPager.page" :page-size="contentSearchPager.pageSize" :total="contentSearchPager.total" @change="searchContent" />
+    </div>
+    <el-empty v-else-if="contentSearch.keyword && !contentSearchLoading" description="暂无内容搜索结果" :image-size="64" />
+  </section>
+
   <div class="knowledge-filters">
     <el-input v-model="filter.keyword" placeholder="搜索后台名称或飞书标题" clearable @change="load(1)" />
     <el-select v-model="filter.type" placeholder="知识库类型" clearable @change="load(1)"><el-option v-for="item in knowledgeTypeOptions" :key="item.value" :label="item.label" :value="item.value" /></el-select>
@@ -420,7 +551,11 @@ async function confirmAction(
           <section v-if="detail.manifest" class="manifest-panel"><h4>Knowledge Manifest</h4><p><strong>用途：</strong>{{ detail.manifest.purpose }}</p><p><strong>适用：</strong>{{ detail.manifest.applicableQuestions }}</p><p><strong>不适用：</strong>{{ detail.manifest.inapplicableQuestions }}</p><p><strong>核心主题：</strong>{{ detail.manifest.coreTopics }}</p><p><strong>边界：</strong>{{ detail.manifest.boundaries }}</p></section>
         </el-tab-pane>
         <el-tab-pane label="内容预览" name="content" lazy>
-          <KnowledgeContentPreview :version-id="previewVersionId" />
+          <KnowledgeContentPreview
+            :version-id="previewVersionId"
+            :target-section-id="previewTargetSectionId"
+            :highlight-keyword="previewHighlightKeyword"
+          />
         </el-tab-pane>
         <el-tab-pane label="同步记录" name="jobs"><el-table :data="jobs"><el-table-column prop="id" label="任务" width="80" /><el-table-column prop="status" label="状态" width="130" /><el-table-column prop="stage" label="阶段" width="130" /><el-table-column label="进度" width="180"><template #default="{ row }"><el-progress :percentage="row.progress" /></template></el-table-column><el-table-column prop="sourceError" label="失败原因" min-width="260" /></el-table></el-tab-pane>
       </el-tabs>
@@ -511,4 +646,134 @@ async function confirmAction(
 .batch-sync-result-table {
   margin-top: 16px;
 }
+
+.knowledge-content-search-panel {
+  margin: 18px 0;
+  padding: 18px;
+  border: 1px solid #dfe8e5;
+  border-radius: 10px;
+  background: #fbfdfc;
+}
+
+.content-search-head {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 20px;
+  margin-bottom: 14px;
+}
+
+.content-search-head h3 {
+  margin: 0;
+  color: #203b32;
+}
+
+.content-search-head p {
+  margin: 6px 0 0;
+  color: #71817b;
+  font-size: 13px;
+}
+
+.content-search-row {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  gap: 12px;
+}
+
+.content-search-results {
+  display: grid;
+  gap: 10px;
+  margin-top: 14px;
+}
+
+.content-search-result-summary {
+  display: flex;
+  justify-content: space-between;
+  gap: 12px;
+  color: #53645e;
+  font-size: 13px;
+}
+
+.content-search-result-summary span {
+  color: #81918b;
+}
+
+.content-search-hit {
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
+  align-items: center;
+  gap: 16px;
+  padding: 14px;
+  border: 1px solid #e1ebe7;
+  border-radius: 8px;
+  background: #ffffff;
+}
+
+.content-search-hit-main {
+  min-width: 0;
+}
+
+.content-search-hit-title {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.content-search-hit-title strong {
+  overflow: hidden;
+  color: #203b32;
+  font-size: 14px;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.content-search-hit-meta {
+  margin: 6px 0 0;
+  color: #708179;
+  font-size: 12px;
+}
+
+.content-search-hit-snippet {
+  margin: 8px 0 0;
+  color: #354840;
+  font-size: 13px;
+  line-height: 1.7;
+}
+
+.content-search-hit-snippet mark {
+  padding: 0 2px;
+  border-radius: 3px;
+  background: #fff1a8;
+  color: inherit;
+}
+
+.content-search-diagnostics {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 6px;
+  margin-top: 8px;
+}
+
+.content-search-diagnostics span {
+  padding: 3px 7px;
+  border-radius: 999px;
+  background: #eef5f2;
+  color: #536b61;
+  font-size: 11px;
+}
+
+@media (max-width: 760px) {
+  .content-search-head,
+  .content-search-result-summary,
+  .content-search-hit {
+    align-items: stretch;
+    grid-template-columns: 1fr;
+    flex-direction: column;
+  }
+
+  .content-search-row {
+    grid-template-columns: 1fr;
+  }
+}
 </style>
diff --git a/ai_knowledge_base_v2/apps/admin-web/src/services/api.ts b/ai_knowledge_base_v2/apps/admin-web/src/services/api.ts
index ebe2fd1..c57c362 100644
--- a/ai_knowledge_base_v2/apps/admin-web/src/services/api.ts
+++ b/ai_knowledge_base_v2/apps/admin-web/src/services/api.ts
@@ -12,6 +12,7 @@ import type {
   ChatRecordQuery,
   DashboardStats,
   KnowledgeItem,
+  KnowledgeContentSearchItem,
   KnowledgeDetail,
   KnowledgeSyncJob,
   KnowledgeVersionContent,
@@ -156,6 +157,8 @@ export const api = {
       { method: "POST", body: JSON.stringify(body) },
     ),
   knowledgeDetail: (id: number) => request<KnowledgeDetail>(`/admin/knowledge/${id}/detail`),
+  knowledgeContentSearch: (query: { keyword: string; includeClosed?: boolean; page?: number; pageSize?: number }) =>
+    request<PageResult<KnowledgeContentSearchItem>>(`/admin/knowledge/content-search${queryString(query)}`),
   knowledgeVersionContent: (versionId: number) => request<KnowledgeVersionContent>(`/admin/knowledge/version/${versionId}/content`),
   knowledgeSyncJobs: (id: number) => request<KnowledgeSyncJob[]>(`/admin/knowledge/${id}/sync-jobs`),
   syncKnowledge: (id: number) =>
diff --git a/ai_knowledge_base_v2/apps/admin-web/src/types/api.ts b/ai_knowledge_base_v2/apps/admin-web/src/types/api.ts
index d0d5fed..6feb81b 100644
--- a/ai_knowledge_base_v2/apps/admin-web/src/types/api.ts
+++ b/ai_knowledge_base_v2/apps/admin-web/src/types/api.ts
@@ -209,6 +209,29 @@ export interface KnowledgeVersionContent {
   cards: Array<Record<string, unknown>>;
 }
 
+export interface KnowledgeContentSearchItem {
+  knowledgeId: number;
+  knowledgeName: string;
+  sourceTitle?: string | null;
+  knowledgeType: "course" | "qa" | "general" | "fixed";
+  knowledgeStatus: number;
+  lifecycleStatus: "active" | "archived";
+  sourceStatus: "normal" | "error";
+  versionId: number;
+  versionNo: number;
+  publishedAt?: string | null;
+  itemType: "section" | "card" | "chunk";
+  itemId: number;
+  sectionId: number;
+  sectionKey: string;
+  title: string;
+  snippet: string;
+  matchedIn: Array<"title" | "content">;
+  hasChunks: boolean;
+  isCurrentVersion: boolean;
+  canAgentUse: boolean;
+}
+
 export interface KnowledgeSyncJob {
   id: number;
   knowledgeId: number;
diff --git a/ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge_lifecycle.py b/ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge_lifecycle.py
index 9f96ea0..f2d5ac1 100644
--- a/ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge_lifecycle.py
+++ b/ai_knowledge_base_v2/apps/backend/app/api/admin_knowledge_lifecycle.py
@@ -3,12 +3,13 @@ from __future__ import annotations
 import json
 
 from fastapi import APIRouter, Depends, HTTPException, Query, status
-from sqlalchemy import func, select
+from sqlalchemy import func, literal, or_, select, union_all
 from sqlalchemy.orm import Session
 
 from app.core.database import get_db
 from app.core.dependencies import get_current_admin
 from app.core.responses import api_success
+from app.api.pagination import page_result
 from app.models.admin import Admin
 from app.models.knowledge import (
     Knowledge,
@@ -165,6 +166,153 @@ def version_content(
     )
 
 
+@router.get("/knowledge/content-search")
+def content_search(
+    keyword: str = Query(default="", min_length=1, max_length=100),
+    includeClosed: bool = Query(default=True),
+    page: int = Query(default=1, ge=1),
+    pageSize: int = Query(default=10, ge=5, le=50),
+    db: Session = Depends(get_db),
+    current_admin: Admin = Depends(get_current_admin),
+) -> dict:
+    _require_super_admin(current_admin)
+    keyword = keyword.strip()
+    if not keyword:
+        return api_success({"items": [], "total": 0, "page": page, "pageSize": pageSize})
+
+    pattern = f"%{_escape_like(keyword)}%"
+    base_filters = [
+        Knowledge.current_version_id.is_not(None),
+        Knowledge.current_version_id == KnowledgeVersion.id,
+        Knowledge.lifecycle_status == "active",
+    ]
+    if not includeClosed:
+        base_filters.append(Knowledge.status == 1)
+
+    section_query = (
+        select(
+            Knowledge.id.label("knowledge_id"),
+            Knowledge.name.label("knowledge_name"),
+            Knowledge.source_title.label("source_title"),
+            Knowledge.knowledge_type.label("knowledge_type"),
+            Knowledge.status.label("knowledge_status"),
+            Knowledge.lifecycle_status.label("lifecycle_status"),
+            Knowledge.source_status.label("source_status"),
+            KnowledgeVersion.id.label("version_id"),
+            KnowledgeVersion.version_no.label("version_no"),
+            KnowledgeVersion.published_at.label("published_at"),
+            literal("section").label("item_type"),
+            literal(1).label("item_rank"),
+            KnowledgeSection.id.label("item_id"),
+            KnowledgeSection.id.label("section_id"),
+            KnowledgeSection.section_key.label("section_key"),
+            KnowledgeSection.title.label("title"),
+            KnowledgeSection.content.label("content"),
+            KnowledgeSection.sort_order.label("sort_order"),
+        )
+        .select_from(KnowledgeSection)
+        .join(Knowledge, Knowledge.id == KnowledgeSection.knowledge_id)
+        .join(KnowledgeVersion, KnowledgeVersion.id == KnowledgeSection.version_id)
+        .where(*base_filters)
+        .where(or_(KnowledgeSection.title.like(pattern, escape="\\"), KnowledgeSection.content.like(pattern, escape="\\")))
+    )
+    card_query = (
+        select(
+            Knowledge.id.label("knowledge_id"),
+            Knowledge.name.label("knowledge_name"),
+            Knowledge.source_title.label("source_title"),
+            Knowledge.knowledge_type.label("knowledge_type"),
+            Knowledge.status.label("knowledge_status"),
+            Knowledge.lifecycle_status.label("lifecycle_status"),
+            Knowledge.source_status.label("source_status"),
+            KnowledgeVersion.id.label("version_id"),
+            KnowledgeVersion.version_no.label("version_no"),
+            KnowledgeVersion.published_at.label("published_at"),
+            literal("card").label("item_type"),
+            literal(2).label("item_rank"),
+            KnowledgeCard.id.label("item_id"),
+            KnowledgeCard.section_id.label("section_id"),
+            KnowledgeSection.section_key.label("section_key"),
+            KnowledgeCard.title.label("title"),
+            KnowledgeCard.summary.label("content"),
+            KnowledgeSection.sort_order.label("sort_order"),
+        )
+        .select_from(KnowledgeCard)
+        .join(Knowledge, Knowledge.id == KnowledgeCard.knowledge_id)
+        .join(KnowledgeVersion, KnowledgeVersion.id == KnowledgeCard.version_id)
+        .join(KnowledgeSection, KnowledgeSection.id == KnowledgeCard.section_id)
+        .where(*base_filters)
+        .where(
+            or_(
+                KnowledgeCard.title.like(pattern, escape="\\"),
+                KnowledgeCard.summary.like(pattern, escape="\\"),
+                KnowledgeCard.core_conclusion.like(pattern, escape="\\"),
+                KnowledgeCard.applicable_questions.like(pattern, escape="\\"),
+                KnowledgeCard.keywords.like(pattern, escape="\\"),
+                KnowledgeCard.synonyms.like(pattern, escape="\\"),
+            )
+        )
+    )
+    chunk_query = (
+        select(
+            Knowledge.id.label("knowledge_id"),
+            Knowledge.name.label("knowledge_name"),
+            Knowledge.source_title.label("source_title"),
+            Knowledge.knowledge_type.label("knowledge_type"),
+            Knowledge.status.label("knowledge_status"),
+            Knowledge.lifecycle_status.label("lifecycle_status"),
+            Knowledge.source_status.label("source_status"),
+            KnowledgeVersion.id.label("version_id"),
+            KnowledgeVersion.version_no.label("version_no"),
+            KnowledgeVersion.published_at.label("published_at"),
+            literal("chunk").label("item_type"),
+            literal(3).label("item_rank"),
+            KnowledgeChunk.id.label("item_id"),
+            KnowledgeChunk.section_id.label("section_id"),
+            KnowledgeSection.section_key.label("section_key"),
+            KnowledgeChunk.title.label("title"),
+            KnowledgeChunk.content.label("content"),
+            KnowledgeSection.sort_order.label("sort_order"),
+        )
+        .select_from(KnowledgeChunk)
+        .join(Knowledge, Knowledge.id == KnowledgeChunk.knowledge_id)
+        .join(KnowledgeVersion, KnowledgeVersion.id == KnowledgeChunk.version_id)
+        .join(KnowledgeSection, KnowledgeSection.id == KnowledgeChunk.section_id)
+        .where(*base_filters)
+        .where(
+            or_(
+                KnowledgeChunk.title.like(pattern, escape="\\"),
+                KnowledgeChunk.content.like(pattern, escape="\\"),
+                KnowledgeChunk.normalized_text.like(pattern, escape="\\"),
+                KnowledgeChunk.keywords.like(pattern, escape="\\"),
+                KnowledgeChunk.synonyms.like(pattern, escape="\\"),
+            )
+        )
+    )
+    search = union_all(section_query, card_query, chunk_query).subquery()
+    total = db.scalar(select(func.count()).select_from(search)) or 0
+    rows = db.execute(
+        select(search)
+        .order_by(
+            search.c.knowledge_status.desc(),
+            search.c.knowledge_id.desc(),
+            search.c.sort_order.asc(),
+            search.c.item_rank.asc(),
+            search.c.item_id.asc(),
+        )
+        .offset((page - 1) * pageSize)
+        .limit(pageSize)
+    ).mappings().all()
+    section_ids = [int(row["section_id"]) for row in rows if row["section_id"]]
+    chunk_section_ids = set()
+    if section_ids:
+        chunk_section_ids = set(
+            db.scalars(select(KnowledgeChunk.section_id).where(KnowledgeChunk.section_id.in_(section_ids))).all()
+        )
+    items = [_content_search_item(row, keyword, int(row["section_id"]) in chunk_section_ids) for row in rows]
+    return api_success(page_result(items, total=total, page=page, page_size=pageSize))
+
+
 @router.get("/knowledge/{knowledge_id}/sync-jobs")
 def sync_jobs(
     knowledge_id: int,
@@ -456,3 +604,64 @@ def _json_value(raw: str | None):
         return json.loads(raw)
     except json.JSONDecodeError:
         return raw
+
+
+def _escape_like(value: str) -> str:
+    return value.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+
+
+def _content_search_item(row, keyword: str, has_chunks: bool) -> dict:
+    title = str(row["title"] or "")
+    content = str(row["content"] or "")
+    is_active_current = (
+        int(row["knowledge_status"] or 0) == 1
+        and row["lifecycle_status"] == "active"
+        and row["source_status"] == "normal"
+        and bool(row["version_id"])
+    )
+    return {
+        "knowledgeId": row["knowledge_id"],
+        "knowledgeName": row["knowledge_name"],
+        "sourceTitle": row["source_title"],
+        "knowledgeType": row["knowledge_type"],
+        "knowledgeStatus": row["knowledge_status"],
+        "lifecycleStatus": row["lifecycle_status"],
+        "sourceStatus": row["source_status"],
+        "versionId": row["version_id"],
+        "versionNo": row["version_no"],
+        "publishedAt": row["published_at"],
+        "itemType": row["item_type"],
+        "itemId": row["item_id"],
+        "sectionId": row["section_id"],
+        "sectionKey": row["section_key"],
+        "title": title,
+        "snippet": _snippet(f"{title}\n{content}", keyword),
+        "matchedIn": _matched_in(title, content, keyword),
+        "hasChunks": has_chunks,
+        "isCurrentVersion": True,
+        "canAgentUse": is_active_current and has_chunks,
+    }
+
+
+def _matched_in(title: str, content: str, keyword: str) -> list[str]:
+    result: list[str] = []
+    lowered = keyword.lower()
+    if lowered in title.lower():
+        result.append("title")
+    if lowered in content.lower():
+        result.append("content")
+    return result or ["content"]
+
+
+def _snippet(text: str, keyword: str, radius: int = 90) -> str:
+    compact = " ".join(text.split())
+    if not compact:
+        return ""
+    index = compact.lower().find(keyword.lower())
+    if index < 0:
+        return compact[: radius * 2] + ("..." if len(compact) > radius * 2 else "")
+    start = max(0, index - radius)
+    end = min(len(compact), index + len(keyword) + radius)
+    prefix = "..." if start > 0 else ""
+    suffix = "..." if end < len(compact) else ""
+    return f"{prefix}{compact[start:end]}{suffix}"
diff --git a/ai_knowledge_base_v2/apps/backend/app/models/ai_config.py b/ai_knowledge_base_v2/apps/backend/app/models/ai_config.py
index d8007be..ae1e5e3 100644
--- a/ai_knowledge_base_v2/apps/backend/app/models/ai_config.py
+++ b/ai_knowledge_base_v2/apps/backend/app/models/ai_config.py
@@ -54,7 +54,7 @@ class ModelConfig(Base):
 class SystemConfig(Base):
     __tablename__ = "sys_system_config"
 
-    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    id: Mapped[int] = mapped_column(BigInteger().with_variant(Integer, "sqlite"), primary_key=True, autoincrement=True)
     config_key: Mapped[str] = mapped_column(String(100), unique=True, nullable=False)
     config_value: Mapped[str] = mapped_column(Text, nullable=False)
     description: Mapped[str | None] = mapped_column(String(255), nullable=True)
diff --git a/ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py b/ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py
index 7a3694b..9d5674d 100644
--- a/ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py
+++ b/ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py
@@ -11,14 +11,16 @@ from sqlalchemy.orm import Session
 from sqlalchemy.pool import StaticPool
 
 from app.api.admin_knowledge import delete_knowledge
-from app.api.admin_knowledge_lifecycle import batch_sync, batch_update_metadata, update_metadata
+from app.api.admin_knowledge_lifecycle import batch_sync, batch_update_metadata, content_search, update_metadata
 from app.models import Base
 from app.models.admin import Admin, Role
 from app.models.knowledge import (
     Knowledge,
     KnowledgeCard,
+    KnowledgeChunk,
     KnowledgeManifest,
     KnowledgePublishLog,
+    KnowledgeSection,
     KnowledgeSourceSnapshot,
     KnowledgeSyncJob,
     KnowledgeVersion,
@@ -268,3 +270,90 @@ def test_sync_validation_failure_keeps_current_version_active():
         assert item.current_version_id == previous_version_id
         assert current.status == "published"
         assert len(versions) == 1
+
+
+def test_content_search_finds_current_sections_cards_and_chunks():
+    with _database() as db:
+        item = _knowledge(db)
+        version_id = item.current_version_id
+        section = KnowledgeSection(
+            knowledge_id=item.id,
+            version_id=version_id,
+            section_key="S0098",
+            title="三十、练习一：静水流深静心",
+            content="选择舒适安全的姿势，觉察呼吸和身体，不适时立即停止。",
+            source_start=0,
+            source_end=40,
+            sort_order=1,
+            content_hash="section-hash",
+        )
+        db.add(section)
+        db.flush()
+        db.add_all([
+            KnowledgeChunk(
+                knowledge_id=item.id,
+                version_id=version_id,
+                section_id=section.id,
+                title=section.title,
+                content="静水流深静心需要选择舒适安全的姿势。",
+                normalized_text="静水流深静心 选择舒适安全的姿势",
+                keywords='["静水流深静心"]',
+                source_start=0,
+                source_end=20,
+                sort_order=1,
+                content_hash="chunk-hash",
+            ),
+            KnowledgeCard(
+                knowledge_id=item.id,
+                version_id=version_id,
+                section_id=section.id,
+                title=section.title,
+                summary="静水流深静心的摘要",
+                core_conclusion="回到身体觉察",
+                applicable_questions="静水流深静心怎么做",
+                inapplicable_questions="天气",
+                keywords='["静水流深静心"]',
+                risk_level="normal",
+                source_range="0-40",
+                content_hash="card-hash",
+                generation_rule_version="test-v1",
+                review_status="approved",
+            ),
+        ])
+        db.commit()
+
+        response = content_search("静水流深", includeClosed=True, page=1, pageSize=10, db=db, current_admin=_admin())
+
+        data = response["data"]
+        assert data["total"] == 3
+        assert {item["itemType"] for item in data["items"]} == {"section", "card", "chunk"}
+        assert data["items"][0]["sectionKey"] == "S0098"
+        assert data["items"][0]["hasChunks"] is True
+        assert data["items"][0]["canAgentUse"] is True
+        assert "静水流深" in data["items"][0]["snippet"]
+
+
+def test_content_search_can_exclude_closed_knowledge():
+    with _database() as db:
+        item = _knowledge(db)
+        item.status = 0
+        db.add(item)
+        db.add(KnowledgeSection(
+            knowledge_id=item.id,
+            version_id=item.current_version_id,
+            section_key="S0001",
+            title="合一作业",
+            content="合一作业内容",
+            source_start=0,
+            source_end=10,
+            sort_order=1,
+            content_hash="closed-section",
+        ))
+        db.commit()
+
+        included = content_search("合一", includeClosed=True, page=1, pageSize=10, db=db, current_admin=_admin())
+        excluded = content_search("合一", includeClosed=False, page=1, pageSize=10, db=db, current_admin=_admin())
+
+        assert included["data"]["total"] == 1
+        assert included["data"]["items"][0]["canAgentUse"] is False
+        assert excluded["data"]["total"] == 0