diff --git a/src/cmbx_styles.py b/src/cmbx_styles.py
new file mode 100644
index 0000000..455de4c
--- /dev/null
+++ b/src/cmbx_styles.py
@@ -0,0 +1,45 @@
+# coding: utf8
+import sys
+from PySide6 import __version__ as pyside6_version
+from PySide6.QtCore import QAbstractListModel, QModelIndex, Qt, QObject
+from PySide6.QtWidgets import QComboBox, QApplication, QWidget
+
+
+class _StyleListModel(QAbstractListModel):
+
+    def __init__(self, parent: QObject = None):
+        super().__init__(parent)
+        if sys.platform == "win32":
+            self.styles = ["windowsvista", "Fusion", "Windows"]
+            ver = list(map(lambda s: int(s), pyside6_version.split(".")))
+            if ver >= [6, 7, 0]:
+                self.styles.insert(0, "windows11")
+        elif sys.platform == "darwin":
+            self.styles = ["macOS", "Fusion", "Windows"]
+        elif sys.platform == "linux":
+            self.styles = ["Fusion", "Windows"]
+        else:
+            self.styles = []
+
+    def rowCount(self, parent: QModelIndex = ...):
+        return len(self.styles)
+
+    def data(self, index: QModelIndex, role: int = ...):
+        row = index.row()
+
+        if role == Qt.ItemDataRole.DisplayRole:
+            return self.styles[row]
+
+
+class StyleComboBox(QComboBox):
+
+    def __init__(self, parent: QWidget = None):
+        super().__init__(parent)
+        self.setModel(_StyleListModel(self))
+        self.currentIndexChanged.connect(self.on_self_current_index_changed)
+
+    def on_self_current_index_changed(self, index: int):
+        model = self.model()
+        idx = model.index(index, 0)
+        style = model.data(idx, Qt.ItemDataRole.DisplayRole)
+        QApplication.setStyle(style)
diff --git a/src/mw_kps_unifier.py b/src/mw_kps_unifier.py
index 5f109b5..27186a1 100644
--- a/src/mw_kps_unifier.py
+++ b/src/mw_kps_unifier.py
@@ -1,27 +1,66 @@
 # coding: utf8
 from PySide6 import QtWidgets, QtCore, QtGui
-from .tab_load import TabLoad
+from .page_load import PageLoad
+from .cmbx_styles import StyleComboBox
 
 
 class UiKpsUnifier(object):
-    def __init__(self, window: QtWidgets.QWidget):
+    def __init__(self, window: QtWidgets.QMainWindow):
         window.setWindowTitle('KeePassXC 多合一')
+        self.cw = QtWidgets.QWidget(window)
         self.vly_m = QtWidgets.QVBoxLayout()
-        window.setLayout(self.vly_m)
+        self.cw.setLayout(self.vly_m)
+        window.setCentralWidget(self.cw)
 
-        self.tw_m = QtWidgets.QTabWidget(window)
-        self.vly_m.addWidget(self.tw_m)
+        self.menu_bar = window.menuBar()
+        self.menu_file = self.menu_bar.addMenu("文件")
+        self.act_new = QtGui.QAction("新建", self.cw)
+        self.act_open = QtGui.QAction("打开", self.cw)
+        self.menu_file.addActions([self.act_new, self.act_open])
 
-        self.tab_load = TabLoad(window)
-        self.tw_m.addTab(self.tab_load, "加载")
-        self.tab_query = QtWidgets.QWidget(window)
-        self.tw_m.addTab(self.tab_query, "查询")
+        self.menu_view = self.menu_bar.addMenu("视图")
+        self.act_load = QtGui.QAction("加载", self.cw)
+        self.act_query = QtGui.QAction("查询", self.cw)
+        self.menu_view.addActions([self.act_load, self.act_query])
+
+        self.hly_top = QtWidgets.QHBoxLayout()
+        self.vly_m.addLayout(self.hly_top)
+
+        self.lne_db_path = QtWidgets.QLineEdit(self.cw)
+        self.lne_db_path.setEnabled(False)
+        self.cmbx_styles = StyleComboBox(self.cw)
+        self.hly_top.addWidget(self.lne_db_path)
+        self.hly_top.addWidget(self.cmbx_styles)
+
+        self.sw_m = QtWidgets.QStackedWidget(self.cw)
+        self.vly_m.addWidget(self.sw_m)
+
+        self.page_load = PageLoad(self.cw)
+        self.sw_m.addWidget(self.page_load)
+        self.page_query = QtWidgets.QWidget(self.cw)
+        self.sw_m.addWidget(self.page_query)
 
 
-class KpsUnifier(QtWidgets.QWidget):
+class KpsUnifier(QtWidgets.QMainWindow):
     def __init__(self, parent=None):
         super().__init__(parent)
         self.ui = UiKpsUnifier(self)
 
+        self.ui.act_open.triggered.connect(self.on_act_open_triggered)
+        self.ui.act_load.triggered.connect(self.on_act_load_triggered)
+        self.ui.act_query.triggered.connect(self.on_act_query_triggered)
+
     def sizeHint(self):
         return QtCore.QSize(860, 640)
+
+    def on_act_open_triggered(self):
+        filename, _ = QtWidgets.QFileDialog.getOpenFileName(self, "打开", "../")
+        if len(filename) == 0:
+            return
+        self.ui.lne_db_path.setText(filename)
+
+    def on_act_load_triggered(self):
+        self.ui.sw_m.setCurrentIndex(0)
+
+    def on_act_query_triggered(self):
+        self.ui.sw_m.setCurrentIndex(1)
diff --git a/src/tab_load.py b/src/page_load.py
similarity index 98%
rename from src/tab_load.py
rename to src/page_load.py
index 14b86d0..3b2e32e 100644
--- a/src/tab_load.py
+++ b/src/page_load.py
@@ -27,7 +27,7 @@ class WgLoadKps(QtWidgets.QWidget):
         item.pbn_load.setDisabled(True)
 
 
-class TabLoad(QtWidgets.QWidget):
+class PageLoad(QtWidgets.QWidget):
     def __init__(self, parent=None):
         super().__init__(parent)
         self.hly_m = QtWidgets.QHBoxLayout()