diff --git a/api/core/rag/datasource/vdb/tidb_on_qdrant/tidb_on_qdrant_vector.py b/api/core/rag/datasource/vdb/tidb_on_qdrant/tidb_on_qdrant_vector.py
index b7e45cf054..8af61ab8b2 100644
--- a/api/core/rag/datasource/vdb/tidb_on_qdrant/tidb_on_qdrant_vector.py
+++ b/api/core/rag/datasource/vdb/tidb_on_qdrant/tidb_on_qdrant_vector.py
@@ -328,13 +328,15 @@ class TidbOnQdrantVector(BaseVector):
         )
         document_ids_filter = kwargs.get("document_ids_filter")
         if document_ids_filter:
+            should_conditions = []
             for document_id_filter in document_ids_filter:
-                filter.should.append(
-                    models.FieldCondition(
+                should_conditions.append(
+                        models.FieldCondition(
                         key="metadata.document_id",
                         match=models.MatchValue(value=document_id_filter),
                     )
                 )
+            filter.should = should_conditions
         results = self._client.search(
             collection_name=self._collection_name,
             query_vector=query_vector,