diff --git a/test/trader/run.py b/test/trader/run.py
new file mode 100644
index 00000000..dd519036
--- /dev/null
+++ b/test/trader/run.py
@@ -0,0 +1,19 @@
+from vnpy.event import EventEngine
+from vnpy.trader.engine import MainEngine
+from vnpy.trader.ui import MainWindow, create_qapp
+
+from vnpy.trader.ui.widget import TickMonitor
+
+if __name__ == "__main__":
+    qapp = create_qapp()
+
+    event_engine = EventEngine()
+    main_engine = MainEngine(event_engine)
+
+    main_window = MainWindow(main_engine, event_engine)
+    main_window.showMaximized()
+
+    monitor = TickMonitor(main_engine, event_engine)
+    monitor.show()
+
+    qapp.exec()
\ No newline at end of file
diff --git a/vnpy/trader/ui/__init__.py b/vnpy/trader/ui/__init__.py
index 709d9260..6bf350d0 100644
--- a/vnpy/trader/ui/__init__.py
+++ b/vnpy/trader/ui/__init__.py
@@ -2,10 +2,10 @@ import platform
 import ctypes
 
 import qdarkstyle
-from PyQt5 import QtWidgets
+from PyQt5 import QtWidgets, QtGui
 
 from .mainwindow import MainWindow
-
+from ..setting import SETTINGS
 
 def create_qapp():
     """
@@ -14,6 +14,9 @@ def create_qapp():
     qapp = QtWidgets.QApplication([])
     qapp.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
 
+    font = QtGui.QFont(SETTINGS["font.family"], SETTINGS["font.size"])
+    qapp.setFont(font)
+
     if 'Windows' in platform.uname():
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID(
             'VN Trader')
diff --git a/vnpy/trader/ui/mainwindow.py b/vnpy/trader/ui/mainwindow.py
new file mode 100644
index 00000000..dd0f5dbb
--- /dev/null
+++ b/vnpy/trader/ui/mainwindow.py
@@ -0,0 +1,26 @@
+from PyQt5 import QtWidgets
+
+from vnpy.event import EventEngine
+from ..engine import MainEngine
+
+
+class MainWindow(QtWidgets.QMainWindow):
+    """
+    Main window of VN Trader.
+    """
+
+    def __init__(self, main_engine: MainEngine, event_engine: EventEngine):
+        """"""
+        super(MainWindow, self).__init__()
+        self.main_engine = main_engine
+        self.event_engine = event_engine
+
+        self.init_ui()
+
+    def init_ui(self):
+        """"""
+        self.setWindowTitle("VN Trader")
+
+    def register_event(self):
+        """"""
+        pass
\ No newline at end of file