diff --git a/ui/main_window.py b/ui/main_window.py
index fac1846..8163117 100644
--- a/ui/main_window.py
+++ b/ui/main_window.py
@@ -76,21 +76,45 @@ class MainWindow(QMainWindow):
         model_layout.addWidget(self.change_model_btn)
         
         # 高级辅助面板（可折叠）
-        self.advanced_group = QGroupBox("高级辅助 (背景与术语)")
-        self.advanced_group.setCheckable(True)
-        self.advanced_group.setChecked(False)
-        self.advanced_group.setStyleSheet(
-            "QGroupBox { border: 1px solid #e2e8f0; border-radius: 8px; margin-top: 10px; }"
-            "QGroupBox::title { subcontrol-origin: margin; left: 10px; padding: 0 5px 0 5px; }"
-        )
+        advanced_panel = QWidget()
+        advanced_layout = QVBoxLayout(advanced_panel)
+        advanced_layout.setSpacing(10)
+        advanced_layout.setContentsMargins(0, 0, 0, 0)
         
-        advanced_layout = QVBoxLayout(self.advanced_group)
-        advanced_layout.setSpacing(15)
-        advanced_layout.setContentsMargins(15, 15, 15, 15)
+        # 高级辅助标题和折叠按钮
+        advanced_header = QWidget()
+        header_layout = QHBoxLayout(advanced_header)
+        header_layout.setContentsMargins(0, 0, 0, 0)
+        header_layout.setSpacing(10)
+        
+        advanced_title = QLabel("高级辅助 (背景与术语)")
+        advanced_title.setStyleSheet("color: #4a5568; font-weight: bold;")
+        
+        self.advanced_toggle = QToolButton()
+        self.advanced_toggle.setText("▼")
+        self.advanced_toggle.setCheckable(True)
+        self.advanced_toggle.setChecked(False)
+        self.advanced_toggle.setFixedSize(20, 20)
+        self.advanced_toggle.setStyleSheet(
+            "border: none; background: none; color: #4a5568;"
+        )
+        self.advanced_toggle.clicked.connect(self.toggle_advanced_panel)
+        
+        header_layout.addWidget(advanced_title)
+        header_layout.addStretch()
+        header_layout.addWidget(self.advanced_toggle)
+        
+        advanced_layout.addWidget(advanced_header)
+        
+        # 高级辅助内容区域
+        self.advanced_content = QWidget()
+        content_layout = QVBoxLayout(self.advanced_content)
+        content_layout.setSpacing(15)
+        content_layout.setContentsMargins(0, 0, 0, 0)
         
         # 文本背景/场景介绍
         context_label = QLabel("文本背景 / 场景介绍")
-        context_label.setStyleSheet("color: #4a5568; font-weight: bold;")
+        context_label.setStyleSheet("color: #4a5568;")
         
         self.context_edit = QTextEdit()
         self.context_edit.setPlaceholderText("例如：这是一份关于建筑工程的合同...")
@@ -101,7 +125,7 @@ class MainWindow(QMainWindow):
         
         # 术语定义
         terms_label = QLabel("术语簿 (定义 A=B)")
-        terms_label.setStyleSheet("color: #4a5568; font-weight: bold;")
+        terms_label.setStyleSheet("color: #4a5568;")
         
         self.terms_list = QListWidget()
         self.terms_list.setStyleSheet(
@@ -112,7 +136,7 @@ class MainWindow(QMainWindow):
         self.term_input = QLineEdit()
         self.term_input.setPlaceholderText("你好 = what's up")
         self.term_input.setStyleSheet(
-            "border: 1px solid #e2e8f0; border-radius: 6px; padding: 8px; flex: 1;"
+            "border: 1px solid #e2e8f0; border-radius: 6px; padding: 8px;"
         )
         
         add_term_btn = QPushButton("+")
@@ -129,11 +153,21 @@ class MainWindow(QMainWindow):
         self.terms_list.setContextMenuPolicy(Qt.CustomContextMenu)
         self.terms_list.customContextMenuRequested.connect(self.show_term_context_menu)
         
-        advanced_layout.addWidget(context_label)
-        advanced_layout.addWidget(self.context_edit)
-        advanced_layout.addWidget(terms_label)
-        advanced_layout.addWidget(self.terms_list)
-        advanced_layout.addLayout(terms_input_layout)
+        content_layout.addWidget(context_label)
+        content_layout.addWidget(self.context_edit)
+        content_layout.addWidget(terms_label)
+        content_layout.addWidget(self.terms_list)
+        content_layout.addLayout(terms_input_layout)
+        
+        advanced_layout.addWidget(self.advanced_content)
+        
+        # 默认隐藏高级辅助内容
+        self.advanced_content.setVisible(False)  
+        
+        # 将高级辅助面板添加到主布局
+        advanced_panel.setStyleSheet(
+            "border: 1px solid #e2e8f0; border-radius: 8px; padding: 15px; margin-top: 10px;"
+        )
         
         # 原文输入区域
         input_layout = QVBoxLayout()
@@ -210,7 +244,7 @@ class MainWindow(QMainWindow):
         # 将所有组件添加到主布局
         main_layout.addWidget(title_label)
         main_layout.addLayout(model_layout)
-        main_layout.addWidget(self.advanced_group)
+        main_layout.addWidget(advanced_panel)
         main_layout.addLayout(input_layout)
         main_layout.addWidget(self.translate_btn)
         main_layout.addLayout(output_layout)
@@ -276,6 +310,12 @@ class MainWindow(QMainWindow):
             else:
                 QMessageBox.warning(self, "警告", "术语格式不正确，请使用 'A = B' 格式")
     
+    def toggle_advanced_panel(self):
+        """切换高级辅助面板的显示/隐藏状态"""
+        is_visible = not self.advanced_content.isVisible()
+        self.advanced_content.setVisible(is_visible)
+        self.advanced_toggle.setText("▲" if is_visible else "▼")
+    
     def show_term_context_menu(self, pos):
         """显示术语项右键菜单"""
         from PySide6.QtWidgets import QMenu