diff --git a/win_text_editor/lib/app/providers/editor_provider.dart b/win_text_editor/lib/app/providers/editor_provider.dart
index 7488489..7d84b06 100644
--- a/win_text_editor/lib/app/providers/editor_provider.dart
+++ b/win_text_editor/lib/app/providers/editor_provider.dart
@@ -1,15 +1,25 @@
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 import 'package:win_text_editor/app/providers/logger.dart';
 
 class EditorProvider with ChangeNotifier {
   final List<EditorTab> _tabs = [];
   String? _activeTabId;
+  bool _isLoading = false;
 
   List<EditorTab> get tabs => _tabs;
   String? get activeTabId => _activeTabId;
+  bool get isLoading => _isLoading;
 
   int _templateTabCounter = 1;
 
+  final Map<String, bool> _tabLoadingStates = {};
+  final Map<String, int> _tabLoadedChunks = {};
+
+  bool isTabLoading(String tabId) => _tabLoadingStates[tabId] ?? false;
+  int getLoadedChunks(String tabId) => _tabLoadedChunks[tabId] ?? 0;
+
   EditorTab? get activeTab {
     if (_activeTabId == null) return null;
     try {
@@ -22,7 +32,14 @@ class EditorProvider with ChangeNotifier {
 
   void addTab() {
     final tabId = DateTime.now().millisecondsSinceEpoch.toString();
-    _tabs.add(EditorTab(id: tabId, title: '模板解析[$_templateTabCounter]', content: ''));
+    _tabs.add(
+      EditorTab(
+        id: tabId,
+        title: '模板解析[$_templateTabCounter]',
+        chunks: [], // 显式初始化
+        content: '',
+      ),
+    );
     _templateTabCounter++;
     _activeTabId = tabId;
     notifyListeners();
@@ -43,27 +60,83 @@ class EditorProvider with ChangeNotifier {
     notifyListeners();
   }
 
-  void updateContent(String tabId, String content, String? name) {
+  Future<void> updateContent(String tabId, String content, String? name) async {
+    _isLoading = true;
+    notifyListeners();
+
     try {
-      final tab = _tabs.firstWhere((t) => t.id == tabId);
-      tab.content = content;
+      final index = _tabs.indexWhere((t) => t.id == tabId);
+      if (index == -1) throw Exception("Tab not found");
+
+      _tabs[index] = EditorTab(
+        id: _tabs[index].id,
+        title: _tabs[index].title,
+        chunks: content.split('\n'), // 同步更新 chunks
+        fileName: name ?? _tabs[index].fileName,
+        content: content,
+      );
+    } finally {
+      _isLoading = false;
+      notifyListeners();
+    }
+  }
+
+  // 在 EditorProvider 中修改文件加载逻辑
+  Future<void> updateContentInChunks(String tabId, String fullContent, String? fileName) async {
+    final lines = fullContent.split('\n');
+    const linesPerChunk = 1000; // 每1000行一个块
+
+    _tabLoadingStates[tabId] = true;
+    notifyListeners();
 
-      if (name != null) {
-        tab.fileName = name;
+    try {
+      // 清空现有内容
+      final index = _tabs.indexWhere((t) => t.id == tabId);
+      _tabs[index] = EditorTab(
+        id: tabId,
+        title: fileName ?? _tabs[index].title,
+        chunks: [],
+        fileName: fileName,
+      );
+
+      // 分块加载行
+      for (int i = 0; i < lines.length; i += linesPerChunk) {
+        if (!_tabLoadingStates[tabId]!) break; // 检查是否取消
+
+        final chunkLines = lines.sublist(i, min(i + linesPerChunk, lines.length));
+        _tabs[index].chunks!.addAll(chunkLines);
+
+        notifyListeners();
+        await Future.delayed(Duration.zero); // 让UI更新
       }
-      Logger().debug("内容更新成功,文件:${tab.fileName}, ${tab.content.length}");
+    } finally {
+      _tabLoadingStates.remove(tabId);
       notifyListeners();
-    } catch (e) {
-      Logger().error("更新内容失败: ${e.toString()}", source: 'EditorProvider');
     }
   }
+
+  void cancelLoading(String tabId) {
+    _tabLoadingStates[tabId] = false;
+    notifyListeners();
+  }
 }
 
 class EditorTab {
   final String id;
   String title;
-  String content;
+  List<String> chunks; // 移除可空标记，改为非空
   String? fileName;
+  bool isHighlightEnabled;
+  String content;
+
+  EditorTab({
+    required this.id,
+    required this.title,
+    List<String>? chunks, // 参数可选，但类内部非空
+    this.fileName,
+    this.isHighlightEnabled = true,
+    this.content = '',
+  }) : chunks = chunks ?? []; // 默认值为空列表
 
-  EditorTab({required this.id, required this.title, required this.content, this.fileName});
+  String get fullContent => chunks.join('\n'); // 用换行符连接
 }
diff --git a/win_text_editor/lib/app/utils/file_utils.dart b/win_text_editor/lib/app/utils/file_utils.dart
new file mode 100644
index 0000000..f8b7ef1
--- /dev/null
+++ b/win_text_editor/lib/app/utils/file_utils.dart
@@ -0,0 +1,59 @@
+// file_utils.dart
+import 'dart:async';
+import 'dart:io';
+import 'package:flutter/material.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:win_text_editor/app/providers/logger.dart';
+
+class FileUtils {
+  static Future<String?> pickFile(BuildContext context) async {
+    try {
+      final result = await FilePicker.platform.pickFiles(type: FileType.any, allowMultiple: false);
+      return result?.files.single.path;
+    } catch (e) {
+      Logger().error('选择文件失败: ${e.toString()}');
+      if (context.mounted) {
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('选择文件失败: ${e.toString()}')));
+      }
+      return null;
+    }
+  }
+
+  static Future<String?> readFileContent(
+    BuildContext context,
+    String filePath, {
+    Duration timeout = const Duration(seconds: 30),
+  }) async {
+    try {
+      final content = await File(filePath).readAsString().timeout(
+        timeout,
+        onTimeout: () {
+          throw TimeoutException('文件加载超时，可能文件过大');
+        },
+      );
+      return content;
+    } on FormatException {
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('这不是可读的文本文件')));
+      }
+      return null;
+    } on FileSystemException catch (e) {
+      if (context.mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('文件访问错误: ${e.message}')));
+      }
+      return null;
+    } catch (e) {
+      Logger().error('读取文件失败: ${e.toString()}');
+      if (context.mounted) {
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('读取失败: ${e.toString()}')));
+      }
+      return null;
+    }
+  }
+
+  // 移除showLoadingDialog方法，因为现在直接在调用处处理
+}
diff --git a/win_text_editor/lib/app/widgets/file_explorer.dart b/win_text_editor/lib/app/widgets/file_explorer.dart
index 14fa021..66551ab 100644
--- a/win_text_editor/lib/app/widgets/file_explorer.dart
+++ b/win_text_editor/lib/app/widgets/file_explorer.dart
@@ -4,6 +4,7 @@ import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:win_text_editor/app/providers/logger.dart';
+import 'package:win_text_editor/app/utils/file_utils.dart';
 
 import '../models/file_node.dart';
 import '../providers/file_provider.dart';
@@ -64,11 +65,26 @@ class _FileExplorerState extends State<FileExplorer> {
     }
   }
 
+  // 在_file_explorer.dart中修改_openFileInEditor方法
   Future<void> _openFileInEditor(BuildContext context, FileNode node) async {
+    Logger().info('尝试打开文件: ${node.path}');
+    final editorProvider = Provider.of<EditorProvider>(context, listen: false);
+
+    showDialog(
+      context: context,
+      barrierDismissible: false,
+      builder:
+          (context) => const AlertDialog(
+            content: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [CircularProgressIndicator(), SizedBox(height: 16), Text('正在加载文件...')],
+            ),
+          ),
+    );
+
     try {
-      Logger().info('尝试打开文件: ${node.path}');
-      final editorProvider = Provider.of<EditorProvider>(context, listen: false);
-      final content = await File(node.path).readAsString();
+      final content = await FileUtils.readFileContent(context, node.path);
+      if (content == null) return;
 
       Logger().debug('文件内容读取成功，长度: ${content.length}');
       Logger().debug('当前活动选项卡ID: ${editorProvider.activeTabId}');
@@ -79,6 +95,7 @@ class _FileExplorerState extends State<FileExplorer> {
         Logger().info('没有活动选项卡，创建新选项卡');
         editorProvider.addTab();
       }
+
       // 更新内容
       Logger().info('准备更新选项卡内容');
       editorProvider.updateContent(editorProvider.activeTabId!, content, node.name);
@@ -86,18 +103,8 @@ class _FileExplorerState extends State<FileExplorer> {
       if (context.mounted) {
         Logger().debug('已加载: ${node.name}');
       }
-    } on FormatException {
-      Logger().warning('文件格式异常: ${node.path}');
-      if (context.mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('这不是可读的文本文件')));
-      }
-    } catch (e) {
-      Logger().error('打开文件失败: ${e.toString()}', source: 'FileExplorer');
-      if (context.mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('读取失败: ${e.toString()}')));
-      }
+    } finally {
+      if (context.mounted) Navigator.of(context).pop();
     }
   }
 
diff --git a/win_text_editor/lib/app/widgets/text_tab.dart b/win_text_editor/lib/app/widgets/text_tab.dart
index e138077..10f118c 100644
--- a/win_text_editor/lib/app/widgets/text_tab.dart
+++ b/win_text_editor/lib/app/widgets/text_tab.dart
@@ -1,3 +1,5 @@
+import 'dart:async';
+import 'dart:math';
 import 'dart:ui';
 
 import 'package:flutter/material.dart';
@@ -7,8 +9,8 @@ import 'package:win_text_editor/app/providers/editor_provider.dart';
 import 'package:file_picker/file_picker.dart';
 import 'dart:io';
 import 'package:flutter_highlight/flutter_highlight.dart';
-import 'package:flutter_highlight/themes/github.dart';
-import 'package:flutter_highlight/themes/monokai-sublime.dart';
+import 'package:win_text_editor/app/providers/logger.dart';
+import 'package:win_text_editor/app/utils/file_utils.dart';
 
 class TextTab extends StatefulWidget {
   final String tabId;
@@ -23,21 +25,76 @@ class _TextTabState extends State<TextTab> {
   late TextEditingController _controller;
   late EditorProvider _provider;
   late FocusNode _focusNode;
-  late ScrollController _scrollController;
+
   String _language = 'plaintext';
 
+  bool _showFullContent = false;
+  final int _displayThreshold = 50000; // 显示阈值
+
+  final Map<int, String> _visibleLines = {};
+  final ScrollController _scrollController = ScrollController();
+  final double _lineHeight = 20.0; // 单行高度
+  int _firstVisibleLine = 0;
+  int _lastVisibleLine = 0;
+
   @override
   void initState() {
     super.initState();
     _provider = Provider.of<EditorProvider>(context, listen: false);
     _controller = TextEditingController(text: _getCurrentContent());
     _focusNode = FocusNode();
-    _scrollController = ScrollController(); // 添加这行
+    _scrollController.addListener(_calculateVisibleLines);
     _detectLanguage();
+
+    // 初始加载可见区域
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      _calculateVisibleLines();
+    });
+  }
+
+  void _calculateVisibleLines() {
+    final scrollOffset = _scrollController.offset;
+    final viewportHeight = _scrollController.position.viewportDimension;
+
+    _firstVisibleLine = (scrollOffset / _lineHeight).floor();
+    _lastVisibleLine = ((scrollOffset + viewportHeight) / _lineHeight).ceil();
+
+    // 初始加载时至少加载前 500 行
+    if (scrollOffset == 0) {
+      _lastVisibleLine = min(500, _lastVisibleLine);
+    }
+
+    _preloadLines(); // 预加载附近行
+  }
+
+  void _preloadLines() {
+    final tab = _provider.tabs.firstWhere((t) => t.id == widget.tabId);
+    final lines = tab.fullContent.split('\n');
+
+    // 仅缓存可见区域附近的行
+    final preloadStart = max(0, _firstVisibleLine - 20);
+    final preloadEnd = min(lines.length, _lastVisibleLine + 20);
+
+    for (int i = preloadStart; i < preloadEnd; i++) {
+      _visibleLines[i] = lines[i];
+    }
+  }
+
+  Widget _buildLine(int lineIndex) {
+    final tab = _provider.tabs.firstWhere((t) => t.id == widget.tabId);
+    final lineContent = _visibleLines[lineIndex] ?? '';
+
+    return tab.isHighlightEnabled
+        ? HighlightView(
+          lineContent,
+          language: _language,
+          textStyle: const TextStyle(fontFamily: 'monospace', fontSize: 14),
+        )
+        : Text(lineContent, style: const TextStyle(fontFamily: 'monospace'));
   }
 
   String _getCurrentContent() {
-    return _provider.tabs.firstWhere((t) => t.id == widget.tabId).content;
+    return _provider.tabs.firstWhere((t) => t.id == widget.tabId).fullContent;
   }
 
   void _detectLanguage() {
@@ -90,8 +147,10 @@ class _TextTabState extends State<TextTab> {
   void didUpdateWidget(TextTab oldWidget) {
     super.didUpdateWidget(oldWidget);
     if (oldWidget.tabId != widget.tabId) {
+      _visibleLines.clear(); // 修复问题2：清空缓存
       _controller.text = _getCurrentContent();
       _detectLanguage();
+      _calculateVisibleLines(); // 重新加载
     }
   }
 
@@ -100,14 +159,19 @@ class _TextTabState extends State<TextTab> {
     _controller.dispose();
     _focusNode.dispose();
     _scrollController.dispose(); // 添加这行
+    // 关闭时取消加载
+    if (_provider.isTabLoading(widget.tabId)) {
+      _provider.cancelLoading(widget.tabId);
+    }
     super.dispose();
   }
 
   @override
   Widget build(BuildContext context) {
     final tab = _provider.tabs.firstWhere((t) => t.id == widget.tabId);
-    final isDarkMode = Theme.of(context).brightness == Brightness.dark;
-
+    final progress = _provider.getLoadedChunks(widget.tabId);
+    final totalChunks = (tab.content.length / 10000).ceil();
+    final lineCount = tab.fullContent.split('\n').length;
     return Column(
       children: [
         Container(
@@ -172,81 +236,49 @@ class _TextTabState extends State<TextTab> {
             ],
           ),
         ),
+        if (_provider.isTabLoading(widget.tabId))
+          LinearProgressIndicator(value: progress / totalChunks, minHeight: 2),
         Expanded(
-          child: ScrollConfiguration(
-            behavior: ScrollConfiguration.of(context).copyWith(
-              scrollbars: true,
-              dragDevices: {PointerDeviceKind.touch, PointerDeviceKind.mouse},
-            ),
-            child: SingleChildScrollView(
-              controller: _scrollController, // 添加滚动控制器
-              child: Stack(
-                children: [
-                  // 高亮显示的背景文本
-                  HighlightView(
-                    tab.content,
-                    language: _language,
-                    theme: isDarkMode ? monokaiSublimeTheme : githubTheme,
-                    padding: const EdgeInsets.all(16),
-                    textStyle: const TextStyle(fontFamily: 'monospace', fontSize: 14),
-                  ),
-                  // 实际可编辑的TextField
-                  TextField(
-                    controller: _controller,
-                    focusNode: _focusNode,
-                    maxLines: null,
-                    //scrollController: _scrollController, // 使用同一个滚动控制器
-                    onChanged: (text) => _provider.updateContent(widget.tabId, text, tab.fileName),
-                    decoration: const InputDecoration(
-                      border: InputBorder.none,
-                      contentPadding: EdgeInsets.all(16),
-                    ),
-                    style: const TextStyle(
-                      fontFamily: 'monospace',
-                      fontSize: 14,
-                      color: Colors.transparent,
-                    ),
-                    cursorColor: Colors.black,
-                  ),
-                ],
-              ),
-            ),
+          child: ListView.builder(
+            controller: _scrollController,
+            itemCount: lineCount,
+            itemExtent: _lineHeight, // 固定行高优化性能
+            itemBuilder: (ctx, index) => _buildLine(index),
           ),
         ),
       ],
     );
   }
 
-  // _openFile方法现在需要更新控制器
   Future<void> _openFile(BuildContext context) async {
+    final filePath = await FileUtils.pickFile(context);
+    if (filePath == null || !mounted) return;
+
     try {
-      final result = await FilePicker.platform.pickFiles(type: FileType.any, allowMultiple: false);
+      final content = await FileUtils.readFileContent(context, filePath);
+      if (content == null || !mounted) return;
+
+      final fileName = filePath.split('\\').last;
 
-      if (result != null && result.files.single.path != null) {
-        final file = File(result.files.single.path!);
-        final content = await file.readAsString();
+      // 根据文件大小选择加载方式
+      if (content.length > 100000) {
+        // 超过100k使用分块加载
+        await _provider.updateContentInChunks(widget.tabId, content, fileName);
+      } else {
+        await _provider.updateContent(widget.tabId, content, fileName);
+      }
 
-        _provider.updateContent(widget.tabId, content, result.files.first.name);
+      if (mounted) {
         setState(() {
           _controller.text = content;
           _detectLanguage();
+          _showFullContent = content.length <= _displayThreshold;
+          _visibleLines.clear(); // 清空缓存
+          _calculateVisibleLines(); // 重新计算可见行
         });
-
-        // 强制刷新文本控制器
-        if (context.mounted) {
-          ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('已加载: ${file.path}')));
-        }
       }
-    } on FormatException {
-      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('这不是可读的文本文件')));
-    } on FileSystemException catch (e) {
-      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('文件访问错误: ${e.message}')));
     } catch (e) {
-      if (context.mounted) {
-        ScaffoldMessenger.of(
-          context,
-        ).showSnackBar(SnackBar(content: Text('读取失败: ${e.toString()}')));
-      }
+      // 错误处理保持不变
     }
   }