diff --git a/dbgpt/rag/knowledge/docx.py b/dbgpt/rag/knowledge/docx.py
index f9bb19bdf..769189f15 100644
--- a/dbgpt/rag/knowledge/docx.py
+++ b/dbgpt/rag/knowledge/docx.py
@@ -15,32 +15,31 @@
 
 
 def load_from_xml_v2(base_uri, rels_item_xml):
+    """Return |_SerializedRelationships| instance loaded with the relationships.
+
+    contained in *rels_item_xml*.collection if *rels_item_xml* is |None|.
     """
-    Return |_SerializedRelationships| instance loaded with the
-    relationships contained in *rels_item_xml*. Returns an empty
-    collection if *rels_item_xml* is |None|.
-    """
-    serial_rels = _SerializedRelationships()
+    srels = _SerializedRelationships()
     if rels_item_xml is not None:
         rels_elm = parse_xml(rels_item_xml)
         for rel_elm in rels_elm.Relationship_lst:
-            if rel_elm.target_ref in ('../NULL', 'NULL'):
+            if rel_elm.target_ref in ("../NULL", "NULL"):
                 continue
-            serial_rels.srels.append(_SerializedRelationship(base_uri, rel_elm))
-    return serial_rels
+            srels._srels.append(_SerializedRelationship(base_uri, rel_elm))
+    return srels
 
 
 class DocxKnowledge(Knowledge):
     """Docx Knowledge."""
 
     def __init__(
-            self,
-            file_path: Optional[str] = None,
-            knowledge_type: Any = KnowledgeType.DOCUMENT,
-            encoding: Optional[str] = "utf-8",
-            loader: Optional[Any] = None,
-            metadata: Optional[Dict[str, Union[str, List[str]]]] = None,
-            **kwargs: Any,
+        self,
+        file_path: Optional[str] = None,
+        knowledge_type: Any = KnowledgeType.DOCUMENT,
+        encoding: Optional[str] = "utf-8",
+        loader: Optional[Any] = None,
+        metadata: Optional[Dict[str, Union[str, List[str]]]] = None,
+        **kwargs: Any,
     ) -> None:
         """Create Docx Knowledge with Knowledge arguments.