diff --git a/lightrag/utils.py b/lightrag/utils.py
index 3daefb88..7b17cbb6 100644
--- a/lightrag/utils.py
+++ b/lightrag/utils.py
@@ -1,5 +1,7 @@
 import asyncio
 import html
+import io
+import csv
 import json
 import logging
 import os
@@ -7,7 +9,7 @@ import re
 from dataclasses import dataclass
 from functools import wraps
 from hashlib import md5
-from typing import Any, Union
+from typing import Any, Union,List
 import xml.etree.ElementTree as ET
 
 import numpy as np
@@ -175,10 +177,21 @@ def truncate_list_by_token_size(list_data: list, key: callable, max_token_size:
     return list_data
 
 
-def list_of_list_to_csv(data: list[list]):
-    return "\n".join(
-        [",\t".join([str(data_dd) for data_dd in data_d]) for data_d in data]
-    )
+# def list_of_list_to_csv(data: list[list]):
+#     return "\n".join(
+#         [",\t".join([str(data_dd) for data_dd in data_d]) for data_d in data]
+#     )
+def list_of_list_to_csv(data: List[List[str]]) -> str:
+    output = io.StringIO()
+    writer = csv.writer(output)
+    writer.writerows(data)
+    return output.getvalue()
+def csv_string_to_list(csv_string: str) -> List[List[str]]:
+    output = io.StringIO(csv_string)
+    reader = csv.reader(output)
+    return [row for row in reader]
+
+
 
 
 def save_data_to_file(data, file_name):
@@ -248,8 +261,8 @@ def xml_to_json(xml_file):
 #混合检索中的合并函数
 def process_combine_contexts(hl, ll):
     header = None
-    list_hl = hl.strip().split("\n")
-    list_ll = ll.strip().split("\n")
+    list_hl = csv_string_to_list(hl.strip())
+    list_ll = csv_string_to_list(ll.strip())
     # 去掉第一个元素（如果不为空）
     if list_hl:
         header=list_hl[0]
@@ -259,12 +272,11 @@ def process_combine_contexts(hl, ll):
         list_ll = list_ll[1:]
     if header is None:
         return ""
-
-    # 去掉每个子元素中逗号分隔后的第一个元素（如果不为空）
+    # 去掉每个子元素中的第一个元素（如果不为空），再转为一维数组，用于合并去重
     if list_hl:
-        list_hl = [','.join(item.split(',')[1:]) for item in list_hl if item]
+        list_hl = [','.join(item[1:]) for item in list_hl if item]
     if list_ll:
-        list_ll = [','.join(item.split(',')[1:]) for item in list_ll if item]
+        list_ll = [','.join(item[1:]) for item in list_ll if item]
 
     # 合并并去重
     combined_sources_set = set(
@@ -272,12 +284,12 @@ def process_combine_contexts(hl, ll):
     )
 
     # 创建包含头部的新列表
-    combined_sources = [header]
+    combined_sources = [",\t".join(header)]
     # 为 combined_sources_set 中的每个元素添加自增数字
     for i, item in enumerate(combined_sources_set, start=1):
         combined_sources.append(f"{i},\t{item}")
-
-    # 将列表转换为字符串，元素之间用换行符分隔
+        
+    # 将列表转换为字符串，子元素之间用换行符分隔
     combined_sources = "\n".join(combined_sources)
 
     return combined_sources