diff --git a/api/app/routers/knowledge.py b/api/app/routers/knowledge.py
index ee43f02..bda6abb 100644
--- a/api/app/routers/knowledge.py
+++ b/api/app/routers/knowledge.py
@@ -309,7 +309,10 @@ def delete_document(kb_id: str, doc_id: str, db: Session = Depends(get_db)):
 # ============ Search ============
 @router.post("/search")
 def search_knowledge_base(query: KnowledgeSearchQuery):
-    return search_knowledge(kb_id=query.kb_id, query=query.query, n_results=query.nResults)
+    try:
+        return search_knowledge(kb_id=query.kb_id, query=query.query, n_results=query.nResults)
+    except ValueError as exc:
+        raise HTTPException(status_code=400, detail=str(exc)) from exc
 
 
 # ============ Stats ============
diff --git a/api/app/vector_store.py b/api/app/vector_store.py
index 418484a..9b9c350 100644
--- a/api/app/vector_store.py
+++ b/api/app/vector_store.py
@@ -64,6 +64,8 @@ class VectorStore:
     ):
         """添加文档片段到向量库"""
         collection = self.get_collection(kb_id)
+        if collection is None:
+            raise ValueError(f"Knowledge collection not found for kb_id={kb_id}")
         
         if ids is None:
             ids = [f"chunk-{i}" for i in range(len(documents))]
@@ -93,6 +95,11 @@ class VectorStore:
     ) -> Dict:
         """检索相似文档"""
         collection = self.get_collection(kb_id)
+        if collection is None:
+            raise ValueError(
+                f"Knowledge collection not found for kb_id={kb_id}. "
+                "Please ensure the knowledge base exists and documents are indexed."
+            )
         
         # 生成查询向量
         query_embedding = embedding_service.embed_query(query)
@@ -108,6 +115,8 @@ class VectorStore:
     def get_stats(self, kb_id: str) -> Dict:
         """获取向量库统计"""
         collection = self.get_collection(kb_id)
+        if collection is None:
+            raise ValueError(f"Knowledge collection not found for kb_id={kb_id}")
         return {
             "count": collection.count(),
             "kb_id": kb_id
@@ -116,11 +125,15 @@ class VectorStore:
     def delete_documents(self, kb_id: str, ids: List[str]):
         """删除指定文档片段"""
         collection = self.get_collection(kb_id)
+        if collection is None:
+            return
         collection.delete(ids=ids)
     
     def delete_by_metadata(self, kb_id: str, document_id: str):
         """根据文档 ID 删除所有片段"""
         collection = self.get_collection(kb_id)
+        if collection is None:
+            return
         results = collection.get(where={"document_id": document_id})
         if results["ids"]:
             collection.delete(ids=results["ids"])
@@ -244,9 +257,6 @@ embedding_service = EmbeddingService()
 
 def search_knowledge(kb_id: str, query: str, n_results: int = 5) -> Dict:
     """知识库检索"""
-    # 生成查询向量
-    query_vector = embedding_service.embed_query(query)
-    
     # 检索
     results = vector_store.search(
         kb_id=kb_id,
diff --git a/web/pages/KnowledgeBase.tsx b/web/pages/KnowledgeBase.tsx
index efddc76..4814ef6 100644
--- a/web/pages/KnowledgeBase.tsx
+++ b/web/pages/KnowledgeBase.tsx
@@ -525,6 +525,8 @@ const KnowledgeBaseDetail: React.FC<{
             <TableRow>
               <TableHead>文档名称</TableHead>
               <TableHead>大小</TableHead>
+              <TableHead>索引状态</TableHead>
+              <TableHead>分片数</TableHead>
               <TableHead>上传时间</TableHead>
               <TableHead className="text-right">操作</TableHead>
             </TableRow>
@@ -536,6 +538,12 @@ const KnowledgeBaseDetail: React.FC<{
                   <FileText className="h-4 w-4 mr-2 text-primary" /> {doc.name}
                 </TableCell>
                 <TableCell className="text-muted-foreground">{doc.size}</TableCell>
+                <TableCell>
+                  <Badge variant="outline">
+                    {doc.status === 'completed' ? '已索引' : doc.status === 'failed' ? '失败' : doc.status === 'processing' ? '处理中' : '待处理'}
+                  </Badge>
+                </TableCell>
+                <TableCell className="text-muted-foreground">{doc.chunkCount ?? 0}</TableCell>
                 <TableCell className="text-muted-foreground">{doc.uploadDate}</TableCell>
                 <TableCell className="text-right">
                   <Button
@@ -550,7 +558,7 @@ const KnowledgeBaseDetail: React.FC<{
               </TableRow>
             )) : (
               <TableRow>
-                <TableCell colSpan={4} className="text-center py-8 text-muted-foreground">暂无文档</TableCell>
+                <TableCell colSpan={6} className="text-center py-8 text-muted-foreground">暂无文档</TableCell>
               </TableRow>
             )}
           </tbody>
diff --git a/web/services/backendApi.ts b/web/services/backendApi.ts
index 9ec96f6..40dab5f 100644
--- a/web/services/backendApi.ts
+++ b/web/services/backendApi.ts
@@ -154,6 +154,8 @@ const mapKnowledgeDocument = (raw: AnyRecord): KnowledgeDocument => ({
   name: readField(raw, ['name'], ''),
   size: readField(raw, ['size'], ''),
   uploadDate: normalizeDateLabel(readField(raw, ['uploadDate', 'upload_date', 'created_at'], '')),
+  status: readField(raw, ['status'], 'pending'),
+  chunkCount: Number(readField(raw, ['chunkCount', 'chunk_count'], 0)),
 });
 
 const mapKnowledgeBase = (raw: AnyRecord): KnowledgeBase => ({
diff --git a/web/types.ts b/web/types.ts
index 0d2a280..9862e73 100644
--- a/web/types.ts
+++ b/web/types.ts
@@ -57,6 +57,8 @@ export interface KnowledgeDocument {
   name: string;
   size: string;
   uploadDate: string;
+  status?: string;
+  chunkCount?: number;
 }
 
 export type InteractionType = 'text' | 'audio' | 'video';