diff --git a/chains/local_doc_qa.py b/chains/local_doc_qa.py
index 2f7d8da..6085dfc 100644
--- a/chains/local_doc_qa.py
+++ b/chains/local_doc_qa.py
@@ -8,7 +8,6 @@ from typing import List
 from utils import torch_gc
 from tqdm import tqdm
 from pypinyin import lazy_pinyin
-from loader import UnstructuredPaddleImageLoader, UnstructuredPaddlePDFLoader
 from models.base import (BaseAnswer,
                          AnswerResult)
 from models.loader.args import parser
@@ -59,6 +58,7 @@ def tree(filepath, ignore_dir_names=None, ignore_file_names=None):
 
 
 def load_file(filepath, sentence_size=SENTENCE_SIZE, using_zh_title_enhance=ZH_TITLE_ENHANCE):
+
     if filepath.lower().endswith(".md"):
         loader = UnstructuredFileLoader(filepath, mode="elements")
         docs = loader.load()
@@ -67,10 +67,14 @@ def load_file(filepath, sentence_size=SENTENCE_SIZE, using_zh_title_enhance=ZH_T
         textsplitter = ChineseTextSplitter(pdf=False, sentence_size=sentence_size)
         docs = loader.load_and_split(textsplitter)
     elif filepath.lower().endswith(".pdf"):
+        # 暂且将paddle相关的loader改为动态加载，可以在不上传pdf/image知识文件的前提下使用protobuf=4.x
+        from loader import UnstructuredPaddlePDFLoader
         loader = UnstructuredPaddlePDFLoader(filepath)
         textsplitter = ChineseTextSplitter(pdf=True, sentence_size=sentence_size)
         docs = loader.load_and_split(textsplitter)
     elif filepath.lower().endswith(".jpg") or filepath.lower().endswith(".png"):
+        # 暂且将paddle相关的loader改为动态加载，可以在不上传pdf/image知识文件的前提下使用protobuf=4.x
+        from loader import UnstructuredPaddleImageLoader
         loader = UnstructuredPaddleImageLoader(filepath, mode="elements")
         textsplitter = ChineseTextSplitter(pdf=False, sentence_size=sentence_size)
         docs = loader.load_and_split(text_splitter=textsplitter)