diff --git a/lightrag/api/requirements.txt b/lightrag/api/requirements.txt
index afd76f5b..995e2bc1 100644
--- a/lightrag/api/requirements.txt
+++ b/lightrag/api/requirements.txt
@@ -16,6 +16,7 @@ python-dotenv
 python-jose[cryptography]
 python-multipart
 pytz
+pyuca
 tenacity
 tiktoken
 uvicorn
diff --git a/lightrag/api/routers/document_routes.py b/lightrag/api/routers/document_routes.py
index d4421cf6..823d7bff 100644
--- a/lightrag/api/routers/document_routes.py
+++ b/lightrag/api/routers/document_routes.py
@@ -3,6 +3,7 @@ This module contains all document-related routes for the LightRAG API.
 """
 
 import asyncio
+from pyuca import Collator
 from lightrag.utils import logger
 import aiofiles
 import shutil
@@ -614,8 +615,12 @@ async def pipeline_index_files(rag: LightRAG, file_paths: List[Path]):
     try:
         enqueued = False
 
+        # Create Collator for Unicode sorting
+        collator = Collator()
+        sorted_file_paths = sorted(file_paths, key=lambda p: collator.sort_key(str(p)))
+
         # Process files sequentially
-        for file_path in file_paths:
+        for file_path in sorted_file_paths:
             if await pipeline_enqueue_file(rag, file_path):
                 enqueued = True
 
diff --git a/requirements.txt b/requirements.txt
index e247185c..3161337a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,9 @@ pipmaster
 pydantic
 python-dotenv
 
+# Unicode Collation Algorithm for proper Chinese sorting
+pyuca
+
 setuptools
 tenacity