diff --git a/backend/app/services/vector_store.py b/backend/app/services/vector_store.py
index e938c25..464e9f2 100644
--- a/backend/app/services/vector_store.py
+++ b/backend/app/services/vector_store.py
@@ -173,10 +173,10 @@ class VectorStoreManager:
             })
         return chunks
 
-    def query(self, task_id: str, query_text: str, n_results: int = 5) -> list[dict]:
+    def query(self, task_id: str, query_text: str, n_results: int = 6) -> list[dict]:
         """
-        分别从 markdown 和 transcript 各检索，确保两种来源都被召回，
-        最后按距离排序返回 top-n。
+        按固定配额从各来源检索：meta 1 条、markdown 2 条、transcript 3 条，
+        确保三种来源都被召回。
         """
         col_name = self._collection_name(task_id)
         try:
@@ -187,21 +187,21 @@ class VectorStoreManager:
 
         all_chunks = []
 
-        # 分别从各来源检索
-        for source_type in ("meta", "markdown", "transcript"):
+        # 每种来源的配额
+        quotas = {"meta": 1, "markdown": 2, "transcript": 3}
+
+        for source_type, quota in quotas.items():
             try:
                 results = collection.query(
                     query_texts=[query_text],
-                    n_results=n_results,
+                    n_results=quota,
                     where={"source_type": source_type},
                 )
                 all_chunks.extend(self._parse_results(results))
             except Exception:
                 pass
 
-        # 按距离排序，取 top-n
-        all_chunks.sort(key=lambda c: c.get("distance", 999))
-        return all_chunks[:n_results]
+        return all_chunks
 
     def delete_index(self, task_id: str) -> None:
         """删除指定任务的向量索引。"""