diff --git a/.pylintrc b/.pylintrc
index b03cd4ae..2c469c4b 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -121,7 +121,7 @@ never-returning-functions=sys.exit
 
 # Regular expression matching correct argument names. Overrides argument-
 # naming-style.
-argument-rgx=[a-z][a-z0-9_]*
+argument-rgx=^[a-z][a-z0-9_]*$
 
 # Naming style matching correct attribute names.
 attr-naming-style=snake_case
diff --git a/vnpy/gateway/futu/futu_gateway.py b/vnpy/gateway/futu/futu_gateway.py
index 8c636063..6870ca58 100644
--- a/vnpy/gateway/futu/futu_gateway.py
+++ b/vnpy/gateway/futu/futu_gateway.py
@@ -262,7 +262,7 @@ class FutuGateway(BaseGateway):
             orderid = str(row["order_id"])
 
         order = req.create_order_data(orderid, self.gateway_name)
-        self.gateway.on_order(order)
+        self.on_order(order)
         return order.vt_orderid
 
     def cancel_order(self, req):
diff --git a/vnpy/gateway/ib/ib_gateway.py b/vnpy/gateway/ib/ib_gateway.py
index 55c51f93..f3adc7fd 100644
--- a/vnpy/gateway/ib/ib_gateway.py
+++ b/vnpy/gateway/ib/ib_gateway.py
@@ -182,21 +182,21 @@ class IbApi(EWrapper):
         self.client = IbClient(self)
         self.thread = Thread(target=self.client.run)
 
-    def connectAck(self):
+    def connectAck(self): # pylint: disable=invalid-name
         """
         Callback when connection is established.
         """
         self.status = True
         self.gateway.write_log("IB TWS连接成功")
 
-    def connectionClosed(self):
+    def connectionClosed(self): # pylint: disable=invalid-name
         """
         Callback when connection is closed.
         """
         self.status = False
         self.gateway.write_log("IB TWS连接断开")
 
-    def nextValidId(self, orderId: int):
+    def nextValidId(self, orderId: int): # pylint: disable=invalid-name
         """
         Callback of next valid orderid.
         """
@@ -204,7 +204,7 @@ class IbApi(EWrapper):
 
         self.orderid = orderId
 
-    def currentTime(self, time: int):
+    def currentTime(self, time: int): # pylint: disable=invalid-name
         """
         Callback of current server time of IB.
         """
@@ -216,7 +216,7 @@ class IbApi(EWrapper):
         msg = f"服务器时间: {time_string}"
         self.gateway.write_log(msg)
 
-    def error(self, reqId: TickerId, errorCode: int, errorString: str):
+    def error(self, reqId: TickerId, errorCode: int, errorString: str): # pylint: disable=invalid-name
         """
         Callback of error caused by specific request.
         """
@@ -225,7 +225,7 @@ class IbApi(EWrapper):
         msg = f"信息通知，代码：{errorCode}，内容: {errorString}"
         self.gateway.write_log(msg)
 
-    def tickPrice(
+    def tickPrice(  # pylint: disable=invalid-name
             self,
             reqId: TickerId,
             tickType: TickType,
@@ -257,7 +257,7 @@ class IbApi(EWrapper):
             tick.datetime = datetime.now()
         self.gateway.on_tick(copy(tick))
 
-    def tickSize(self, reqId: TickerId, tickType: TickType, size: int):
+    def tickSize(self, reqId: TickerId, tickType: TickType, size: int): # pylint: disable=invalid-name
         """
         Callback of tick volume update.
         """
@@ -272,7 +272,7 @@ class IbApi(EWrapper):
 
         self.gateway.on_tick(copy(tick))
 
-    def tickString(self, reqId: TickerId, tickType: TickType, value: str):
+    def tickString(self, reqId: TickerId, tickType: TickType, value: str): # pylint: disable=invalid-name
         """
         Callback of tick string update.
         """
@@ -286,7 +286,7 @@ class IbApi(EWrapper):
 
         self.gateway.on_tick(copy(tick))
 
-    def orderStatus(
+    def orderStatus(  # pylint: disable=invalid-name
             self,
             orderId: OrderId,
             status: str,
@@ -325,7 +325,7 @@ class IbApi(EWrapper):
 
         self.gateway.on_order(copy(order))
 
-    def openOrder(
+    def openOrder(  # pylint: disable=invalid-name
             self,
             orderId: OrderId,
             ib_contract: Contract,
@@ -354,7 +354,7 @@ class IbApi(EWrapper):
         self.orders[orderid] = order
         self.gateway.on_order(copy(order))
 
-    def updateAccountValue(
+    def updateAccountValue(  # pylint: disable=invalid-name
             self,
             key: str,
             val: str,
@@ -381,7 +381,7 @@ class IbApi(EWrapper):
         name = ACCOUNTFIELD_IB2VT[key]
         setattr(account, name, float(val))
 
-    def updatePortfolio(
+    def updatePortfolio(  # pylint: disable=invalid-name
             self,
             contract: Contract,
             position: float,
@@ -419,7 +419,7 @@ class IbApi(EWrapper):
         )
         self.gateway.on_position(pos)
 
-    def updateAccountTime(self, timeStamp: str):
+    def updateAccountTime(self, timeStamp: str): # pylint: disable=invalid-name
         """
         Callback of account update time.
         """
@@ -427,7 +427,7 @@ class IbApi(EWrapper):
         for account in self.accounts.values():
             self.gateway.on_account(copy(account))
 
-    def contractDetails(self, reqId: int, contractDetails: ContractDetails):
+    def contractDetails(self, reqId: int, contractDetails: ContractDetails): # pylint: disable=invalid-name
         """
         Callback of contract data update.
         """
@@ -456,7 +456,7 @@ class IbApi(EWrapper):
 
         self.contracts[contract.vt_symbol] = contract
 
-    def execDetails(self, reqId: int, contract: Contract, execution: Execution):
+    def execDetails(self, reqId: int, contract: Contract, execution: Execution): # pylint: disable=invalid-name
         """
         Callback of trade data update.
         """
@@ -479,7 +479,7 @@ class IbApi(EWrapper):
 
         self.gateway.on_trade(trade)
 
-    def managedAccounts(self, accountsList: str):
+    def managedAccounts(self, accountsList: str): # pylint: disable=invalid-name
         """
         Callback of all sub accountid.
         """
diff --git a/vnpy/trader/ui/widget.py b/vnpy/trader/ui/widget.py
index e96f669b..0bbe26ad 100644
--- a/vnpy/trader/ui/widget.py
+++ b/vnpy/trader/ui/widget.py
@@ -11,8 +11,15 @@ from PyQt5 import QtWidgets, QtGui, QtCore
 from vnpy.event import EventEngine, Event
 from ..constant import Direction, Offset, PriceType, Exchange
 from ..engine import MainEngine
-from ..event import (EVENT_TICK, EVENT_ORDER, EVENT_TRADE, EVENT_ACCOUNT,
-                     EVENT_POSITION, EVENT_CONTRACT, EVENT_LOG)
+from ..event import (
+    EVENT_TICK,
+    EVENT_ORDER,
+    EVENT_TRADE,
+    EVENT_ACCOUNT,
+    EVENT_POSITION,
+    EVENT_CONTRACT,
+    EVENT_LOG
+)
 from ..object import SubscribeRequest, OrderRequest, CancelRequest
 from ..utility import load_setting, save_setting
 
@@ -63,7 +70,7 @@ class EnumCell(BaseCell):
         """
         if content:
             super(EnumCell, self).set_content(content.value, data)
-        
+
 
 class DirectionCell(EnumCell):
     """
@@ -282,7 +289,8 @@ class BaseMonitor(QtWidgets.QTableWidget):
         Resize all columns according to contents.
         """
         self.horizontalHeader().resizeSections(
-            QtWidgets.QHeaderView.ResizeToContents)
+            QtWidgets.QHeaderView.ResizeToContents
+        )
 
     def save_csv(self):
         """
@@ -308,12 +316,12 @@ class BaseMonitor(QtWidgets.QTableWidget):
                     else:
                         row_data.append("")
                 writer.writerow(row_data)
-    
+
     def contextMenuEvent(self, event):
         """
         Show menu with right click.
         """
-        self.menu.popup(QtGui.QCursor.pos())    
+        self.menu.popup(QtGui.QCursor.pos())
 
 
 class TickMonitor(BaseMonitor):
@@ -664,7 +672,7 @@ class ConnectDialog(QtWidgets.QDialog):
     """
     Start connection of a certain gateway.
     """
-    
+
     def __init__(self, main_engine: MainEngine, gateway_name: str):
         """"""
         super(ConnectDialog, self).__init__()
@@ -676,17 +684,19 @@ class ConnectDialog(QtWidgets.QDialog):
         self.widgets = {}
 
         self.init_ui()
-    
+
     def init_ui(self):
         """"""
         self.setWindowTitle(f"连接{self.gateway_name}")
 
         # Default setting provides field name, field data type and field default value.
-        default_setting = self.main_engine.get_default_setting(self.gateway_name)
+        default_setting = self.main_engine.get_default_setting(
+            self.gateway_name
+        )
 
         # Saved setting provides field data used last time.
         loaded_setting = load_setting(self.file_name)
-        
+
         # Initialize line edits and form layout based on setting.
         form = QtWidgets.QFormLayout()
 
@@ -729,13 +739,12 @@ class ConnectDialog(QtWidgets.QDialog):
             else:
                 field_value = field_type(widget.text())
             setting[field_name] = field_value
-        
+
         self.main_engine.connect(setting, self.gateway_name)
-        
+
         save_setting(self.file_name, setting)
 
         self.accept()
-    
 
 
 class TradingWidget(QtWidgets.QWidget):
@@ -744,7 +753,7 @@ class TradingWidget(QtWidgets.QWidget):
     """
 
     signal_tick = QtCore.pyqtSignal(Event)
-    
+
     def __init__(self, main_engine: MainEngine, event_engine: EventEngine):
         """"""
         super(TradingWidget, self).__init__()
@@ -756,7 +765,7 @@ class TradingWidget(QtWidgets.QWidget):
 
         self.init_ui()
         self.register_event()
-    
+
     def init_ui(self):
         """"""
         self.setFixedWidth(300)
@@ -772,20 +781,22 @@ class TradingWidget(QtWidgets.QWidget):
         self.name_line.setReadOnly(True)
 
         self.direction_combo = QtWidgets.QComboBox()
-        self.direction_combo.addItems([
-            Direction.LONG.value,
-            Direction.SHORT.value
-        ])
+        self.direction_combo.addItems(
+            [Direction.LONG.value,
+             Direction.SHORT.value]
+        )
 
         self.offset_combo = QtWidgets.QComboBox()
         self.offset_combo.addItems([offset.value for offset in Offset])
 
         self.price_type_combo = QtWidgets.QComboBox()
-        self.price_type_combo.addItems([price_type.value for price_type in PriceType])
+        self.price_type_combo.addItems(
+            [price_type.value for price_type in PriceType]
+        )
 
         double_validator = QtGui.QDoubleValidator()
         double_validator.setBottom(0)
-        
+
         self.price_line = QtWidgets.QLineEdit()
         self.price_line.setValidator(double_validator)
 
@@ -817,18 +828,33 @@ class TradingWidget(QtWidgets.QWidget):
         # Market depth display area
         bid_color = "rgb(255,174,201)"
         ask_color = "rgb(160,255,160)"
-        
+
         self.bp1_label = self.create_label(bid_color)
         self.bp2_label = self.create_label(bid_color)
         self.bp3_label = self.create_label(bid_color)
         self.bp4_label = self.create_label(bid_color)
         self.bp5_label = self.create_label(bid_color)
 
-        self.bv1_label = self.create_label(bid_color, alignment=QtCore.Qt.AlignRight)
-        self.bv2_label = self.create_label(bid_color, alignment=QtCore.Qt.AlignRight)
-        self.bv3_label = self.create_label(bid_color, alignment=QtCore.Qt.AlignRight)
-        self.bv4_label = self.create_label(bid_color, alignment=QtCore.Qt.AlignRight)
-        self.bv5_label = self.create_label(bid_color, alignment=QtCore.Qt.AlignRight)
+        self.bv1_label = self.create_label(
+            bid_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.bv2_label = self.create_label(
+            bid_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.bv3_label = self.create_label(
+            bid_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.bv4_label = self.create_label(
+            bid_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.bv5_label = self.create_label(
+            bid_color,
+            alignment=QtCore.Qt.AlignRight
+        )
 
         self.ap1_label = self.create_label(ask_color)
         self.ap2_label = self.create_label(ask_color)
@@ -836,11 +862,26 @@ class TradingWidget(QtWidgets.QWidget):
         self.ap4_label = self.create_label(ask_color)
         self.ap5_label = self.create_label(ask_color)
 
-        self.av1_label = self.create_label(ask_color, alignment=QtCore.Qt.AlignRight)
-        self.av2_label = self.create_label(ask_color, alignment=QtCore.Qt.AlignRight)
-        self.av3_label = self.create_label(ask_color, alignment=QtCore.Qt.AlignRight)
-        self.av4_label = self.create_label(ask_color, alignment=QtCore.Qt.AlignRight)
-        self.av5_label = self.create_label(ask_color, alignment=QtCore.Qt.AlignRight)
+        self.av1_label = self.create_label(
+            ask_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.av2_label = self.create_label(
+            ask_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.av3_label = self.create_label(
+            ask_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.av4_label = self.create_label(
+            ask_color,
+            alignment=QtCore.Qt.AlignRight
+        )
+        self.av5_label = self.create_label(
+            ask_color,
+            alignment=QtCore.Qt.AlignRight
+        )
 
         self.lp_label = self.create_label()
         self.return_label = self.create_label(alignment=QtCore.Qt.AlignRight)
@@ -857,14 +898,18 @@ class TradingWidget(QtWidgets.QWidget):
         form2.addRow(self.bp3_label, self.bv3_label)
         form2.addRow(self.bp4_label, self.bv4_label)
         form2.addRow(self.bp5_label, self.bv5_label)
-        
+
         # Overall layout
         vbox = QtWidgets.QVBoxLayout()
         vbox.addLayout(form1)
         vbox.addLayout(form2)
         self.setLayout(vbox)
-    
-    def create_label(self, color: str = "", alignment: int = QtCore.Qt.AlignLeft):
+
+    def create_label(
+            self,
+            color: str = "",
+            alignment: int = QtCore.Qt.AlignLeft
+    ):
         """
         Create label with certain font color.
         """
@@ -873,12 +918,12 @@ class TradingWidget(QtWidgets.QWidget):
             label.setStyleSheet(f"color:{color}")
         label.setAlignment(alignment)
         return label
-        
+
     def register_event(self):
         """"""
         self.signal_tick.connect(self.process_tick_event)
         self.event_engine.register(EVENT_TICK, self.signal_tick.emit)
-    
+
     def process_tick_event(self, event: Event):
         """"""
         tick = event.data
@@ -894,8 +939,8 @@ class TradingWidget(QtWidgets.QWidget):
         if tick.pre_close:
             r = (tick.last_price / tick.pre_close - 1) * 100
             self.return_label.setText(f"{r:.2f}%")
-        
-        if tick.bid_price_2:    
+
+        if tick.bid_price_2:
             self.bp2_label.setText(str(tick.bid_price_2))
             self.bv2_label.setText(str(tick.bid_volume_2))
             self.ap2_label.setText(str(tick.ask_price_2))
@@ -948,10 +993,7 @@ class TradingWidget(QtWidgets.QWidget):
         self.clear_label_text()
 
         # Subscribe tick data
-        req = SubscribeRequest(
-            symbol=symbol,
-            exchange=Exchange(exchange_value)
-        )
+        req = SubscribeRequest(symbol=symbol, exchange=Exchange(exchange_value))
 
         self.main_engine.subscribe(req, gateway_name)
 
@@ -992,21 +1034,15 @@ class TradingWidget(QtWidgets.QWidget):
         """
         symbol = str(self.symbol_line.text())
         if not symbol:
-            QtWidgets.QMessageBox.critical(
-                "委托失败",
-                "请输入合约代码"
-            )
+            QtWidgets.QMessageBox.critical("委托失败", "请输入合约代码")
             return
 
         volume_text = str(self.volume_line.text())
         if not volume_text:
-            QtWidgets.QMessageBox.critical(
-                "委托失败",
-                "请输入委托数量"
-            )
+            QtWidgets.QMessageBox.critical("委托失败", "请输入委托数量")
             return
         volume = float(volume_text)
-        
+
         price_text = str(self.price_line.text())
         if not price_text:
             price = 0
@@ -1026,7 +1062,7 @@ class TradingWidget(QtWidgets.QWidget):
         gateway_name = str(self.gateway_combo.currentText())
 
         self.main_engine.send_order(req, gateway_name)
-    
+
     def cancel_all(self):
         """
         Cancel all active orders.
@@ -1051,7 +1087,7 @@ class ActiveOrderMonitor(OrderMonitor):
         order = event.data
         row_cells = self.cells[order.vt_orderid]
         row = self.row(row_cells["volume"])
-        
+
         if order.is_active():
             self.showRow(row)
         else:
@@ -1081,7 +1117,7 @@ class ContractManager(QtWidgets.QWidget):
         self.event_engine = event_engine
 
         self.init_ui()
-    
+
     def init_ui(self):
         """"""
         self.setWindowTitle("合约查询")
@@ -1108,13 +1144,13 @@ class ContractManager(QtWidgets.QWidget):
         hbox = QtWidgets.QHBoxLayout()
         hbox.addWidget(self.filter_line)
         hbox.addWidget(self.button_show)
-        
+
         vbox = QtWidgets.QVBoxLayout()
         vbox.addLayout(hbox)
         vbox.addWidget(self.contract_table)
 
         self.setLayout(vbox)
-    
+
     def show_contracts(self):
         """
         Show contracts by symbol
@@ -1123,7 +1159,10 @@ class ContractManager(QtWidgets.QWidget):
 
         all_contracts = self.main_engine.get_all_contracts()
         if flt:
-            contracts = [contract for contract in all_contracts if flt in contract.vt_symbol]
+            contracts = [
+                contract for contract in all_contracts
+                if flt in contract.vt_symbol
+            ]
         else:
             contracts = all_contracts
 
@@ -1155,7 +1194,7 @@ class AboutDialog(QtWidgets.QDialog):
         self.event_engine = event_engine
 
         self.init_ui()
-    
+
     def init_ui(self):
         """"""
         self.setWindowTitle(f"关于VN Trader")