diff --git a/digital-avatar-app/backend/routers/knowledge.py b/digital-avatar-app/backend/routers/knowledge.py
index 77b664e..58a9eec 100644
--- a/digital-avatar-app/backend/routers/knowledge.py
+++ b/digital-avatar-app/backend/routers/knowledge.py
@@ -32,6 +32,14 @@ class EnabledIn(BaseModel):
     enabled: bool = True
 
 
+def _doc_payload(doc: KnowledgeDoc) -> dict:
+    payload = doc.to_dict()
+    stored_name = os.path.basename(doc.file_url or "")
+    stored_path = os.path.join(UPLOAD_DIR, doc.avatar_id, stored_name)
+    payload["filePresent"] = bool(stored_name and os.path.isfile(stored_path))
+    return payload
+
+
 def _resolve_user(authorization: str | None, db: Session):
     if not authorization:
         return None
@@ -61,7 +69,7 @@ def list_docs(avatar_id: str, authorization: str = Header(None), db: Session = D
         .order_by(KnowledgeDoc.created_at.desc())
         .all()
     )
-    return ok([d.to_dict() for d in docs])
+    return ok([_doc_payload(d) for d in docs])
 
 
 @router.post("/avatar/{avatar_id}/knowledge/docs")
@@ -121,7 +129,7 @@ async def upload_doc(avatar_id: str, file: UploadFile = File(...), authorization
         db.commit()
         db.refresh(doc)
 
-    return ok(doc.to_dict())
+    return ok(_doc_payload(doc))
 
 
 @router.delete("/avatar/{avatar_id}/knowledge/docs/{doc_id}")
diff --git a/digital-avatar-app/backend/tests/test_knowledge_storage.py b/digital-avatar-app/backend/tests/test_knowledge_storage.py
new file mode 100644
index 0000000..89c6f3d
--- /dev/null
+++ b/digital-avatar-app/backend/tests/test_knowledge_storage.py
@@ -0,0 +1,23 @@
+from pathlib import Path
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from routers.knowledge import _doc_payload
+
+
+def test_doc_payload_reports_whether_the_persisted_file_exists(tmp_path: Path):
+    avatar_id = "avatar-1"
+    stored_name = "knowledge.md"
+    doc = SimpleNamespace(
+        avatar_id=avatar_id,
+        file_url=f"/api/files/{avatar_id}/{stored_name}",
+        to_dict=lambda: {"id": "doc-1", "fileUrl": f"/api/files/{avatar_id}/{stored_name}"},
+    )
+    stored_dir = tmp_path / avatar_id
+    stored_dir.mkdir()
+    stored_file = stored_dir / stored_name
+
+    with patch("routers.knowledge.UPLOAD_DIR", str(tmp_path)):
+        assert _doc_payload(doc)["filePresent"] is False
+        stored_file.write_text("knowledge", encoding="utf-8")
+        assert _doc_payload(doc)["filePresent"] is True
diff --git a/digital-avatar-app/src/api/index.ts b/digital-avatar-app/src/api/index.ts
index fe43335..929be23 100644
--- a/digital-avatar-app/src/api/index.ts
+++ b/digital-avatar-app/src/api/index.ts
@@ -202,6 +202,7 @@ export interface KnowledgeDoc {
   fileSize: number
   fileUrl: string
   status: string
+  filePresent?: boolean
   vectorized?: boolean
   embeddingModel?: string
   chunkCount?: number
diff --git a/digital-avatar-app/src/views/KnowledgeManage.vue b/digital-avatar-app/src/views/KnowledgeManage.vue
index 574673c..ac7d5ee 100644
--- a/digital-avatar-app/src/views/KnowledgeManage.vue
+++ b/digital-avatar-app/src/views/KnowledgeManage.vue
@@ -37,10 +37,10 @@
             <div class="card-content">
               <div class="card-title-row">
                 <strong>{{ doc.filename }}</strong>
-                <span class="status-pill" :class="{ pending: !doc.vectorized }">{{ doc.vectorized ? '已入库' : '处理中' }}</span>
+                <span class="status-pill" :class="{ pending: !doc.vectorized && doc.filePresent !== false, missing: doc.filePresent === false }">{{ doc.filePresent === false ? '文件缺失' : (doc.vectorized ? '已入库' : '处理中') }}</span>
               </div>
               <p class="card-meta">{{ doc.fileType.toUpperCase() }} · {{ formatSize(doc.fileSize) }} · {{ formatDate(doc.createdAt) }}</p>
-              <p class="card-detail">{{ doc.vectorized ? `已切分 ${doc.chunkCount || 0} 段，可用于对话` : '正在解析并建立知识索引' }}</p>
+              <p class="card-detail">{{ doc.filePresent === false ? '原文件不可用，请删除后重新上传' : (doc.vectorized ? `已切分 ${doc.chunkCount || 0} 段，可用于对话` : '正在解析并建立知识索引') }}</p>
             </div>
             <button class="card-delete" @click="removeDoc(doc.id)">删除</button>
           </article>
@@ -268,6 +268,7 @@ onMounted(async () => {
 .card-title-row { display: flex; align-items: center; gap: 8px; min-width: 0; }
 .card-title-row strong { min-width: 0; flex: 1; overflow: hidden; color: #27201C; font-size: 14px; text-overflow: ellipsis; white-space: nowrap; }
 .status-pill { flex: 0 0 auto; display: inline-flex; padding: 4px 7px; border-radius: 999px; color: #15803D; background: #ECFDF3; font-size: 10px; white-space: nowrap; }.status-pill.pending { color: #B45309; background: #FFFBEB; }
+.status-pill.missing { color: #B91C1C; background: #FEF2F2; }
 .card-meta, .card-detail { margin: 5px 0 0; color: #9398AE; font-size: 11px; line-height: 1.4; }.card-detail { color: #8B6B58; }
 .card-delete { flex: 0 0 auto; align-self: center; border: 0; color: #EF4444; background: #FEF2F2; border-radius: 8px; padding: 7px 9px; font-size: 12px; cursor: pointer; }
 .card-empty { padding: 42px 16px; border: 1px dashed #F1D9C3; border-radius: 16px; color: #9398AE; background: #fff; font-size: 14px; text-align: center; }