diff --git a/src/budget/__init__.py b/src/budget/__init__.py
index 4a6f3ac..fa3c8a3 100644
--- a/src/budget/__init__.py
+++ b/src/budget/__init__.py
@@ -11,4 +11,5 @@ class MainWindow(QMainWindow):
         self.initUI()
     
     from ._mw import initUI
-    from ._pg import connectToDatabase, disconnectFromDatabase, onConnectClicked
\ No newline at end of file
+    from ._pg import connectToDatabase, disconnectFromDatabase, onConnectClicked, initConnectTab
+    from ._category import initCategorytTab, onCategoryAddClicked
\ No newline at end of file
diff --git a/src/budget/_category.py b/src/budget/_category.py
new file mode 100644
index 0000000..51ebaba
--- /dev/null
+++ b/src/budget/_category.py
@@ -0,0 +1,63 @@
+from PyQt6.QtWidgets import *
+
+def initCategorytTab(self):
+    # 创建连接信息控件
+    self.categoryComboBox = QComboBox()
+    
+    self.categoryAddButton = QPushButton('Add New Category')
+    self.categoryAddButton.clicked.connect(self.onCategoryAddClicked)
+
+    # 创建控件布局
+    categoryLayout = QHBoxLayout()
+    categoryLayout.addWidget(self.categoryComboBox)
+    categoryLayout.addWidget(self.categoryAddButton)
+     
+    # 连接信号槽
+    # self.connectButton.clicked.connect(self.onConnectClicked)
+
+    categoryWidget = QWidget()
+    categoryWidget.setLayout(categoryLayout)
+    return categoryWidget
+
+
+def onCategoryAddClicked(self):
+    try:
+        if (self.cur is None):
+            raise Exception('Not connected to database')
+
+        # 创建添加数据对话框
+        addDialog = QDialog(self)
+        addDialog.setWindowTitle('Add New Category')
+        addDialog.resize(400, 300)
+
+        label1 = QLabel("Category Name:")
+        line1 = QLineEdit()
+        label2 = QLabel("Category Type")
+        line2 =QComboBox()
+        line2.addItem("Income")
+        line2.addItem("Expense")
+        button1 = QPushButton("Confirm")
+        button2 = QPushButton("Abort")
+
+        button1.clicked.connect(addDialog.accept)
+        button2.clicked.connect(addDialog.reject)
+
+        layout = QFormLayout()
+        layout.addRow(label1,line1)
+        layout.addRow(label2,line2)
+        layout.addRow(button1,button2)
+
+        addDialog.setLayout(layout)
+
+        # 显示添加数据对话框
+        if addDialog.exec() == QDialog.DialogCode.Accepted:
+            try:
+                print("success")
+            except Exception as e:
+                # 处理插入数据错误
+                print(e)
+                QMessageBox.critical(self, 'Error', str(e))
+    except Exception as e:
+        # 处理获取表格列名错误
+        print(e)
+        QMessageBox.critical(self, 'Error', str(e))
\ No newline at end of file
diff --git a/src/budget/_mw.py b/src/budget/_mw.py
index 8860f05..f879ad8 100644
--- a/src/budget/_mw.py
+++ b/src/budget/_mw.py
@@ -1,56 +1,18 @@
 from PyQt6.QtWidgets import *
+from ._pg import initConnectTab
+from ._category import initCategorytTab
 
 def initUI(self):
     self.setWindowTitle('budget')
     self.setGeometry(100, 100, 800, 600)
 
-    # 创建连接信息控件
-    self.hostLabel = QLabel('Host:')
-    self.hostLineEdit = QLineEdit()
-    self.hostLineEdit.setText('localhost')
+    connectTab = initConnectTab(self)
+    categoryTab = initCategorytTab(self)
 
-    self.portLabel = QLabel('Port:')
-    self.portLineEdit = QLineEdit()
-    self.portLineEdit.setText('5432')
-
-    self.dbNameLabel = QLabel('Database:')
-    self.dbNameLineEdit = QLineEdit()
-    self.dbNameLineEdit.setText('budget')
-
-    self.userLabel = QLabel('Username:')
-    self.userLineEdit = QLineEdit()
-    self.userLineEdit.setText('postgres')
-
-    self.passwordLabel = QLabel('Password:')
-    self.passwordLineEdit = QLineEdit()
-    self.passwordLineEdit.setEchoMode(QLineEdit.EchoMode.Password)
-    self.passwordLineEdit.setText('')
-
-    self.connectButton = QPushButton('Connect')
-    self.connectButton.clicked.connect(self.onConnectClicked)
-
-    # 创建连接信息控件布局
-    connectLayout = QHBoxLayout()
-    connectLayout.addWidget(self.hostLabel)
-    connectLayout.addWidget(self.hostLineEdit)
-    connectLayout.addWidget(self.portLabel)
-    connectLayout.addWidget(self.portLineEdit)
-    connectLayout.addWidget(self.dbNameLabel)
-    connectLayout.addWidget(self.dbNameLineEdit)
-    connectLayout.addWidget(self.userLabel)
-    connectLayout.addWidget(self.userLineEdit)
-    connectLayout.addWidget(self.passwordLabel)
-    connectLayout.addWidget(self.passwordLineEdit)
-    connectLayout.addWidget(self.connectButton)
-
-    connectWidget = QWidget()
-    connectWidget.setLayout(connectLayout)
-
-    # 创建主窗口布局
-    mainLayout = QVBoxLayout()
-    mainLayout.addWidget(connectWidget)
-
-    mainWidget = QWidget()
-    mainWidget.setLayout(mainLayout)
+    # 创建主窗口tab布局
+    mainWidget = QTabWidget()
+    mainWidget.addTab(connectTab, 'Connect')
+    mainWidget.addTab(categoryTab, 'Category')
 
     self.setCentralWidget(mainWidget)
+
diff --git a/src/budget/_pg.py b/src/budget/_pg.py
index 2c560dd..e341f5e 100644
--- a/src/budget/_pg.py
+++ b/src/budget/_pg.py
@@ -35,3 +35,50 @@ def onConnectClicked(self):
     else:
         self.disconnectFromDatabase()
         self.connectButton.setText('Connect')
+
+
+def initConnectTab(self):
+    # 创建连接信息控件
+    self.hostLabel = QLabel('Host:')
+    self.hostLineEdit = QLineEdit()
+    self.hostLineEdit.setText('159.75.75.169')
+
+    self.portLabel = QLabel('Port:')
+    self.portLineEdit = QLineEdit()
+    self.portLineEdit.setText('5432')
+
+    self.dbNameLabel = QLabel('Database:')
+    self.dbNameLineEdit = QLineEdit()
+    self.dbNameLineEdit.setText('budget')
+
+    self.userLabel = QLabel('Username:')
+    self.userLineEdit = QLineEdit()
+    self.userLineEdit.setText('budget')
+
+    self.passwordLabel = QLabel('Password:')
+    self.passwordLineEdit = QLineEdit()
+    self.passwordLineEdit.setEchoMode(QLineEdit.EchoMode.Password)
+    self.passwordLineEdit.setText('budget')
+
+    self.connectButton = QPushButton('Connect')
+
+    # 连接信号槽
+    self.connectButton.clicked.connect(self.onConnectClicked)
+
+    # 创建连接信息控件布局
+    connectLayout = QHBoxLayout()
+    connectLayout.addWidget(self.hostLabel)
+    connectLayout.addWidget(self.hostLineEdit)
+    connectLayout.addWidget(self.portLabel)
+    connectLayout.addWidget(self.portLineEdit)
+    connectLayout.addWidget(self.dbNameLabel)
+    connectLayout.addWidget(self.dbNameLineEdit)
+    connectLayout.addWidget(self.userLabel)
+    connectLayout.addWidget(self.userLineEdit)
+    connectLayout.addWidget(self.passwordLabel)
+    connectLayout.addWidget(self.passwordLineEdit)
+    connectLayout.addWidget(self.connectButton)
+
+    connectWidget = QWidget()
+    connectWidget.setLayout(connectLayout)
+    return connectWidget
\ No newline at end of file