diff --git a/vnpy/api/rest/rest_client.py b/vnpy/api/rest/rest_client.py
index c2083688..dd36a503 100644
--- a/vnpy/api/rest/rest_client.py
+++ b/vnpy/api/rest/rest_client.py
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 import sys
 import traceback
 from datetime import datetime
diff --git a/vnpy/api/websocket/websocket_client.py b/vnpy/api/websocket/websocket_client.py
index 84596a34..870d87a4 100644
--- a/vnpy/api/websocket/websocket_client.py
+++ b/vnpy/api/websocket/websocket_client.py
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 import json
 import ssl
 import sys
diff --git a/vnpy/gateway/alpaca/alpaca_gateway.py b/vnpy/gateway/alpaca/alpaca_gateway.py
index 036708c3..b9df4b32 100644
--- a/vnpy/gateway/alpaca/alpaca_gateway.py
+++ b/vnpy/gateway/alpaca/alpaca_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Author: vigarbuaa
 """
diff --git a/vnpy/gateway/bitfinex/bitfinex_gateway.py b/vnpy/gateway/bitfinex/bitfinex_gateway.py
index 832c2969..ecec31d3 100644
--- a/vnpy/gateway/bitfinex/bitfinex_gateway.py
+++ b/vnpy/gateway/bitfinex/bitfinex_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Author: vigarbuaa
 """
diff --git a/vnpy/gateway/bitmex/bitmex_gateway.py b/vnpy/gateway/bitmex/bitmex_gateway.py
index 444f85b2..e5af3082 100644
--- a/vnpy/gateway/bitmex/bitmex_gateway.py
+++ b/vnpy/gateway/bitmex/bitmex_gateway.py
@@ -1,6 +1,4 @@
-# encoding: UTF-8
-"""
-"""
+""""""
 
 import hashlib
 import hmac
diff --git a/vnpy/gateway/femas/femas_gateway.py b/vnpy/gateway/femas/femas_gateway.py
index 47f80fbb..2fd6a4e8 100644
--- a/vnpy/gateway/femas/femas_gateway.py
+++ b/vnpy/gateway/femas/femas_gateway.py
@@ -1,6 +1,4 @@
-# encoding: UTF-8
-"""
-"""
+""""""
 
 from datetime import datetime
 
diff --git a/vnpy/gateway/futu/futu_gateway.py b/vnpy/gateway/futu/futu_gateway.py
index 2f45adbe..895be70a 100644
--- a/vnpy/gateway/futu/futu_gateway.py
+++ b/vnpy/gateway/futu/futu_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Please install futu-api before use.
 """
diff --git a/vnpy/gateway/oes/oes_gateway.py b/vnpy/gateway/oes/oes_gateway.py
index fd763782..9ed76ddf 100644
--- a/vnpy/gateway/oes/oes_gateway.py
+++ b/vnpy/gateway/oes/oes_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Author: nanoric
 """
diff --git a/vnpy/gateway/okex/okex_gateway.py b/vnpy/gateway/okex/okex_gateway.py
index ba7a2f80..5ea47268 100644
--- a/vnpy/gateway/okex/okex_gateway.py
+++ b/vnpy/gateway/okex/okex_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 """
 
diff --git a/vnpy/gateway/okexf/okexf_gateway.py b/vnpy/gateway/okexf/okexf_gateway.py
index 26c1c87a..b1212682 100644
--- a/vnpy/gateway/okexf/okexf_gateway.py
+++ b/vnpy/gateway/okexf/okexf_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Author: qqqlyx
 """
diff --git a/vnpy/gateway/onetoken/onetoken_gateway.py b/vnpy/gateway/onetoken/onetoken_gateway.py
index e6af5faa..bd586eb3 100644
--- a/vnpy/gateway/onetoken/onetoken_gateway.py
+++ b/vnpy/gateway/onetoken/onetoken_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 """
 
diff --git a/vnpy/gateway/tiger/tiger_gateway.py b/vnpy/gateway/tiger/tiger_gateway.py
index c7796782..cfbead5e 100644
--- a/vnpy/gateway/tiger/tiger_gateway.py
+++ b/vnpy/gateway/tiger/tiger_gateway.py
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 """
 Author: KeKe
 Please install tiger-api before use.