diff --git a/python/examples/pipeline/ocr/hybrid_service_pipeline_server.py b/python/examples/pipeline/ocr/hybrid_service_pipeline_server.py
index c19ec486e33a221a2f85081c94d58faa28379ca5..241230c44e17be0fb4323f87ec1076bfd5c8a220 100644
--- a/python/examples/pipeline/ocr/hybrid_service_pipeline_server.py
+++ b/python/examples/pipeline/ocr/hybrid_service_pipeline_server.py
@@ -131,6 +131,6 @@ response_op = ResponseOp(input_ops=[rec_op])
 
 server = PipelineServer()
 server.set_response_op(response_op)
-server.start_local_rpc_service()  # add this line
 server.prepare_server('config.yml')
+server.start_local_rpc_service()  # add this line
 server.run_server()
diff --git a/python/examples/pipeline/ocr/local_service_pipeline_server.py b/python/examples/pipeline/ocr/local_service_pipeline_server.py
index 23a5bb4c588ad6437da2bcb5ff0c7e4463efc286..c3dd115d9f31ec3e24f956b736ea22da7329c0d6 100644
--- a/python/examples/pipeline/ocr/local_service_pipeline_server.py
+++ b/python/examples/pipeline/ocr/local_service_pipeline_server.py
@@ -130,6 +130,6 @@ response_op = ResponseOp(input_ops=[rec_op])
 
 server = PipelineServer()
 server.set_response_op(response_op)
-server.start_local_rpc_service()  # add this line
 server.prepare_server('config.yml')
+server.start_local_rpc_service()  # add this line
 server.run_server()
diff --git a/python/examples/pipeline/ocr/pipeline_http_client.py b/python/examples/pipeline/ocr/pipeline_http_client.py
index 6cbef6a68533a2f7d5bdc53bb91af27746a3d789..7963f54b0df866785c82925975b51e082c9908c9 100644
--- a/python/examples/pipeline/ocr/pipeline_http_client.py
+++ b/python/examples/pipeline/ocr/pipeline_http_client.py
@@ -18,9 +18,6 @@ import json
 import cv2
 import base64
 import os
-import time
-import util
-import multiprocessing
 
 
 def cv2_to_base64(image):