diff --git a/languages/en.json b/languages/en.json
index 8991bbb..2becc63 100644
--- a/languages/en.json
+++ b/languages/en.json
@@ -8,6 +8,7 @@
     "spanish": "Español (Spanish)",
     "portuguese": "Português (Portuguese)",
     "russian": "Русский (Russian)",
+    "chinese": "中文 (简体) (Chinese Simplified)",
     "help_text": "Select your preferred language for the interface.",
     "restart_notice": "Language change will take effect after restarting the application."
   },
diff --git a/languages/es.json b/languages/es.json
index d42a43b..78411b5 100644
--- a/languages/es.json
+++ b/languages/es.json
@@ -7,7 +7,8 @@
     "english": "Inglés",
     "spanish": "Español (Spanish)",
     "portuguese": "Português (Portuguese)",
-    "russian": "Русский (Russian)"
+    "russian": "Русский (Russian)",
+    "chinese": "中文 (简体) (Chinese Simplified)"
   },
   "app": {
     "title": "YTSage",
diff --git a/languages/pt.json b/languages/pt.json
index 8a5e27c..9692b3f 100644
--- a/languages/pt.json
+++ b/languages/pt.json
@@ -8,6 +8,7 @@
     "spanish": "Espanhol",
     "portuguese": "Português",
     "russian": "Русский (Russian)",
+    "chinese": "中文 (简体) (Chinese Simplified)",
     "help_text": "Selecione seu idioma preferido para a interface.",
     "restart_notice": "A alteração de idioma terá efeito após reiniciar a aplicação."
   },
diff --git a/languages/ru.json b/languages/ru.json
index 4c63ff6..c29b222 100644
--- a/languages/ru.json
+++ b/languages/ru.json
@@ -8,6 +8,7 @@
     "spanish": "Испанский",
     "portuguese": "Португальский",
     "russian": "Русский",
+    "chinese": "中文 (简体) (Chinese Simplified)",
     "help_text": "Выберите предпочитаемый язык для интерфейса.",
     "restart_notice": "Изменение языка вступит в силу после перезапуска приложения."
   },
diff --git a/languages/zh.json b/languages/zh.json
new file mode 100644
index 0000000..ae7910c
--- /dev/null
+++ b/languages/zh.json
@@ -0,0 +1,329 @@
+{
+  "language": {
+    "display_name": "中文 (简体) (Chinese Simplified)",
+    "select_language": "选择语言：",
+    "current_language": "当前语言：{language}",
+    "restart_required": "语言更改将在重启应用程序后生效。",
+    "english": "英语",
+    "spanish": "西班牙语",
+    "portuguese": "葡萄牙语",
+    "russian": "俄语",
+    "chinese": "中文",
+    "help_text": "选择您喜欢的界面语言。",
+    "restart_notice": "语言更改将在重启应用程序后生效。"
+  },
+  "app": {
+    "title": "YTSage",
+    "version": "v{version}",
+    "ready": "准备就绪"
+  },
+  "formats": {
+    "show_formats": "显示格式：",
+    "video_format": "视频格式：",
+    "audio_format": "音频格式：",
+    "no_formats": "无可用格式",
+    "loading": "正在加载格式...",
+    "select": "选择",
+    "quality": "质量",
+    "extension": "扩展名",
+    "resolution": "分辨率",
+    "file_size": "文件大小",
+    "codec": "编解码器",
+    "audio": "音频",
+    "notes": "备注",
+    "will_merge_audio": "将合并音频",
+    "has_audio": "✓ 有音频",
+    "audio_only": "仅音频",
+    "large_size": "大尺寸",
+    "medium_size": "中等尺寸",
+    "standard_size": "标准尺寸",
+    "compatible": "兼容",
+    "efficient": "高效",
+    "high_quality": "高质量",
+    "best_4k": "最佳 (4K)",
+    "best_2k": "最佳 (2K)",
+    "high_1080p": "高清 (1080p)",
+    "high_720p": "高清 (720p)",
+    "medium_480p": "中等 (480p)",
+    "low_quality": "低质量",
+    "best_audio": "最佳音频",
+    "high_audio": "高质量音频",
+    "medium_audio": "中等音频",
+    "low_audio": "低质量音频",
+    "audio_only_resolution": "仅音频"
+  },
+  "buttons": {
+    "download": "下载",
+    "pause": "暂停",
+    "resume": "恢复", 
+    "cancel": "取消",
+    "browse": "浏览",
+    "clear": "清除",
+    "ok": "确定",
+    "apply": "应用",
+    "close": "关闭",
+    "run_command": "运行命令",
+    "custom_command_help": "帮助",
+    "about": "关于",
+    "analyze": "分析",
+    "paste_url": "粘贴网址",
+    "select_videos": "选择视频...",
+    "video": "视频",
+    "audio_only": "仅音频",
+    "custom_options": "自定义选项",
+    "trim_video": "裁剪视频",
+    "download_settings": "下载设置",
+    "update": "更新 yt-dlp",
+    "select_defaults": "选择默认值",
+    "select_all": "全选",
+    "deselect_all": "取消全选"
+  },
+  "dialogs": {
+    "custom_options": "自定义选项",
+    "settings": "设置",
+    "select_folder": "选择下载文件夹",
+    "sponsorblock_categories": "SponsorBlock 分类",
+    "sponsorblock_description": "选择在下载期间自动删除的视频片段类型。\nSponsorBlock 使用社区提交的数据来识别这些片段。",
+    "select_subtitles": "选择字幕",
+    "filter_languages_placeholder": "过滤语言（例如：en, zh）...",
+    "no_subtitles_available": "无可用字幕",
+    "matching": "匹配"
+  },
+  "tabs": {
+    "cookies": "使用 Cookie 登录",
+    "custom_command": "自定义命令",
+    "proxy": "代理", 
+    "language": "语言"
+  },
+  "cookies": {
+    "help_text": "选择如何提供 cookie 来登录。\n这允许下载私人视频和高级质量音频。",
+    "cookie_source": "Cookie 来源",
+    "use_cookie_file": "使用 cookie 文件",
+    "extract_from_browser": "从浏览器提取",
+    "cookie_file": "Cookie 文件",
+    "cookie_file_placeholder": "cookies.txt 文件路径...",
+    "browser_selection": "浏览器选择",
+    "browser_help": "选择要从中提取 cookie 的浏览器：",
+    "browser_label": "浏览器：",
+    "profile_label": "配置文件：",
+    "profile_placeholder": "默认",
+    "browser_extract_message": "应用时将提取浏览器 cookie",
+    "file_selected_message": "已选择 Cookie 文件 - 点击确定应用",
+    "select_file_title": "选择 Cookie 文件",
+    "file_filter": "Cookie 文件 (*.txt *.lwp)"
+  },
+  "custom_command": {
+    "help_text": "在下面输入您的自定义 yt-dlp 命令。当前网址将自动附加。<br><br>有关选项和使用示例的完整列表，<a href=\"{docs_url}\">点击此处查看官方 yt-dlp 文档</a>。<br><br>注意：下载路径和文件名模板将自动处理。",
+    "input_label": "yt-dlp 参数：",
+    "input_placeholder": "在此输入 yt-dlp 参数...\n\n例如：--extract-audio --audio-format mp3",
+    "output_label": "命令输出：",
+    "output_placeholder": "命令输出将显示在此处...",
+    "command_placeholder": "输入自定义 yt-dlp 命令...",
+    "command_help": "可用占位符：\n{url} - 视频网址\n{output} - 输出目录\n\n示例：--write-info-json --write-thumbnail",
+    "full_command": "🔧 完整命令：{command}",
+    "command_success": "✅ 自定义命令执行成功！",
+    "command_failed": "❌ 命令失败，退出代码 {code}",
+    "command_error": "❌ 执行自定义命令时出错：{error}"
+  },
+  "proxy": {
+    "help_text": "配置下载的代理设置。留空使用直接连接。",
+    "main_proxy": "主代理",
+    "main_proxy_help": "所有下载的主代理服务器。支持 HTTP/HTTPS 和 SOCKS5 协议。",
+    "proxy_url_label": "代理网址：",
+    "proxy_url_placeholder": "http://proxy:port 或 socks5://proxy:port",
+    "proxy_examples": "示例：\n• HTTP：http://proxy.example.com:8080\n• SOCKS5：socks5://proxy.example.com:1080",
+    "geo_proxy": "地理绕过代理",
+    "geo_proxy_help": "专门用于绕过地理限制的辅助代理。",
+    "geo_proxy_url_label": "地理绕过代理网址：",
+    "geo_proxy_url_placeholder": "http://geo-proxy:port",
+    "clear_main_proxy": "清除主代理",
+    "clear_geo_proxy": "清除地理代理",
+    "proxy_url": "代理网址",
+    "proxy_placeholder": "http://proxy:port 或 socks5://proxy:port",
+    "geo_bypass": "地理绕过代理（用于地理限制）",
+    "geo_bypass_placeholder": "http://proxy:port 用于绕过地理封锁",
+    "invalid_main_url": "主代理网址格式无效",
+    "invalid_geo_url": "地理代理网址格式无效",
+    "main_configured": "主代理已配置",
+    "geo_configured": "地理代理已配置"
+  },
+  "download": {
+    "preparing": "正在准备下载...",
+    "please_enter_url": "请先输入网址。",
+    "please_set_path": "请先设置下载路径。",
+    "please_enter_url_and_path": "请输入网址并设置下载路径。",
+    "please_select_format": "请先选择格式。"
+  },
+  "update": {
+    "title": "更新 yt-dlp",
+    "checking": "正在检查更新...",
+    "update_available": "有可用更新！\n当前版本：{current}\n最新版本：{latest}",
+    "up_to_date": "yt-dlp 已是最新版本（版本 {version}）",
+    "could_not_determine": "无法确定版本。",
+    "error_comparing": "比较版本时出错：{error}",
+    "update_available_failed": "有可用更新！（比较失败）\n当前：{current}\n最新：{latest}",
+    "updating": "正在更新...",
+    "initializing": "🚀 初始化更新过程...",
+    "checking_current": "🔍 检查当前安装...",
+    "found_at": "📍 在以下位置找到 yt-dlp：{path}",
+    "error_getting_path": "❌ 获取 yt-dlp 路径时出错：{error}",
+    "updating_binary": "📦 正在更新应用程序管理的 yt-dlp 二进制文件...",
+    "updating_pip": "🐍 正在通过 pip 更新系统 yt-dlp...",
+    "update_failed": "❌ 更新 yt-dlp 失败。请重试或检查您的互联网连接。",
+    "binary_updated": "✅ 二进制文件更新成功！",
+    "update_failed_stderr": "❌ yt-dlp 更新失败：{error}",
+    "update_timeout": "❌ yt-dlp 更新超时。",
+    "unexpected_error": "❌ 更新期间出现意外错误：{error}",
+    "checking_pip": "🔍 检查当前 pip 安装...",
+    "current_version": "📋 当前版本：{version}",
+    "not_found_pip": "⚠️ 通过 pip 未找到 yt-dlp，尝试安装...",
+    "checking_latest": "🌐 检查最新版本...",
+    "failed_check_updates": "❌ 检查更新失败",
+    "latest_version": "🆕 最新版本：{version}",
+    "updating_from_to": "⬆️ 从 {current} 更新到 {latest}...",
+    "running_pip_install": "📦 运行 pip install --upgrade...",
+    "pip_completed": "✅ pip 更新完成成功！",
+    "pip_failed": "❌ pip 更新失败：{error}"
+  },
+  "about": {
+    "title": "关于 YTSage",
+    "version": "版本 {version}",
+    "description": "具有简洁 PySide6 界面的现代 YouTube 下载器。",
+    "author": "作者：{author}",
+    "github": "GitHub：{repo}",
+    "system_info": "系统信息",
+    "loading": "🔄 正在加载系统信息...",
+    "refresh": "🔄",
+    "refreshing": "🔄 正在刷新...",
+    "refresh_failed": "刷新失败",
+    "refresh_failed_message": "无法刷新版本信息。",
+    "detected": "✓ 已检测到",
+    "missing": "✗ 缺失",
+    "not_available": "不可用"
+  },
+  "time_range": {
+    "title": "裁剪视频",
+    "time_range_group": "时间范围",
+    "start_time": "开始时间 (HH:MM:SS)",
+    "end_time": "结束时间 (HH:MM:SS)",
+    "start_placeholder": "00:00:00",
+    "end_placeholder": "00:00:00",
+    "start_time_placeholder": "开始时间 (HH:MM:SS)",
+    "end_time_placeholder": "结束时间 (HH:MM:SS)",
+    "force_keyframes": "在切割点强制关键帧",
+    "help_text": "设置开始和结束时间来裁剪视频。\n留空下载完整视频。",
+    "invalid_format": "时间格式无效。请使用 HH:MM:SS 格式。",
+    "start_after_end": "开始时间不能晚于结束时间。"
+  },
+  "settings": {
+    "title": "下载设置",
+    "download_path": "下载路径",
+    "browse": "浏览...",
+    "speed_limit": "速度限制",
+    "speed_limit_placeholder": "无",
+    "auto_update_ytdlp": "自动更新 yt-dlp",
+    "enable_auto_updates": "启用 yt-dlp 自动更新",
+    "update_frequency": "更新频率：",
+    "check_startup": "每次启动时检查（检查间隔最少 1 小时）",
+    "check_daily": "每日检查",
+    "check_weekly": "每周检查",
+    "check_updates_now": "立即检查更新",
+    "update_check_title": "更新检查",
+    "could_not_determine_version": "无法确定当前 yt-dlp 版本。",
+    "update_available_dialog": "有可用更新！\\n\\n当前：{current}\\n最新：{latest}\\n\\n使用主窗口中的'更新 yt-dlp'按钮进行更新。",
+    "up_to_date_dialog": "yt-dlp 已是最新版本！\n\n当前版本：{version}",
+    "error_checking_updates": "检查更新时出错：{error}",
+    "settings_saved_title": "设置已保存",
+    "settings_saved_message": "自动更新设置已成功保存！",
+    "error_title": "错误",
+    "failed_save_settings": "保存自动更新设置失败。",
+    "error_saving_settings": "保存自动更新设置时出错：{error}",
+    "auto_update_title": "自动更新设置",
+    "auto_update_header": "🔄 自动更新设置",
+    "auto_update_description": "为 yt-dlp 配置自动更新，以确保您始终拥有最新功能和错误修复。",
+    "current_status": "当前状态",
+    "current_version_label": "当前 yt-dlp 版本：检查中...",
+    "last_check_label": "上次更新检查：从未",
+    "next_check_label": "下次检查：基于设置",
+    "manual_check_button": "🔍 立即检查更新",
+    "update_frequency_group": "更新频率",
+    "save_settings": "保存设置",
+    "settings_saved_successfully": "✅ 设置保存成功！",
+    "error_saving": "❌ 保存设置时出错：{error}"
+  },
+  "main_ui": {
+    "url_placeholder": "输入 YouTube 视频或播放列表网址",
+    "merge_subtitles": "合并字幕",
+    "save_thumbnail": "保存缩略图",
+    "save_description": "保存描述",
+    "embed_chapters": "嵌入章节",
+    "subtitles_selected": "已选择 {count} 个",
+    "all_selected": "全部已选择",
+    "select_videos_all": "选择视频...（全部已选择）",
+    "please_enter_url": "请先输入网址",
+    "cookie_file_selected_title": "已选择 Cookie 文件",
+    "cookie_file_selected_message": "已选择 Cookie 文件：{path}",
+    "browser_cookies_selected_title": "已选择浏览器 Cookie",
+    "browser_cookies_selected_message": "将从以下浏览器提取 Cookie：{browser}",
+    "error_no_format_info": "错误：无可用格式信息。",
+    "error_extract_info": "错误：无法提取基本视频信息。请检查您的链接。",
+    "analyzing_preparing": "分析中 (0%)... 正在准备请求",
+    "analyzing_extracting_basic": "分析中 (15%)... 正在提取基本信息",
+    "analyzing_extracting_detailed": "分析中 (30%)... 正在提取详细信息",
+    "analyzing_processing_video": "分析中 (45%)... 正在处理视频数据",
+    "analyzing_processing_formats": "分析中 (60%)... 正在处理格式",
+    "analyzing_loading_thumbnail": "分析中 (75%)... 正在加载缩略图",
+    "analyzing_processing_subtitles": "分析中 (85%)... 正在处理字幕",
+    "analyzing_updating_table": "分析中 (95%)... 正在更新格式表",
+    "analysis_complete": "分析完成！",
+    "analyzing_extracting_ytdlp": "分析中 (30%)... 使用 yt-dlp 可执行文件提取信息",
+    "analyzing_processing_data": "分析中 (60%)... 正在处理数据",
+    "analyzing_processing_formats_ytdlp": "分析中 (75%)... 正在处理格式",
+    "analyzing_loading_thumbnail_ytdlp": "分析中 (85%)... 正在加载缩略图",
+    "analyzing_processing_subtitles_ytdlp": "分析中 (90%)... 正在处理字幕",
+    "select_subtitles": "选择字幕...",
+    "sponsorblock_categories": "SponsorBlock 分类..."
+  },
+  "sponsorblock": {
+    "sponsor": "赞助商",
+    "sponsor_desc": "付费推广、付费推荐和直接广告",
+    "selfpromo": "非付费/自我推广",
+    "selfpromo_desc": "创作者对自己内容的非付费推广",
+    "interaction": "互动提醒",
+    "interaction_desc": "要求观众点赞、订阅或关注社交媒体",
+    "intro": "开头",
+    "intro_desc": "可以跳过的视频开头",
+    "outro": "结尾/片尾卡片",
+    "outro_desc": "制作人员名单或视频结束时",
+    "preview": "预览/回顾",
+    "preview_desc": "对以前视频的快速回顾或即将到来内容的预览",
+    "music_offtopic": "非音乐部分",
+    "music_offtopic_desc": "仅适用于音乐视频。标记非音乐部分",
+    "filler": "填充切线",
+    "filler_desc": "仅为填充或幽默而添加的切线场景"
+  },
+  "video_info": {
+    "channel": "频道",
+    "views": "观看次数",
+    "likes": "点赞数",
+    "upload_date": "上传日期",
+    "duration": "时长",
+    "unknown_channel": "未知频道",
+    "unknown_date": "未知日期",
+    "unknown_title": "未知标题"
+  },
+  "command": {
+    "running": "正在运行...",
+    "run_command": "运行命令"
+  },
+  "selection": {
+    "none_selected": "未选择",
+    "one_selected": "已选择 1 个分类",
+    "count_selected": "已选择 {count} 个"
+  },
+  "status": {
+    "ready": "准备就绪",
+    "file_exists": "⚠️ 文件已存在",
+    "cancelling": "正在取消下载..."
+  }
+}
\ No newline at end of file
diff --git a/src/gui/ytsage_gui_format_table.py b/src/gui/ytsage_gui_format_table.py
index 5ff0a66..89529d5 100644
--- a/src/gui/ytsage_gui_format_table.py
+++ b/src/gui/ytsage_gui_format_table.py
@@ -264,14 +264,14 @@ class FormatTableMixin:
             # Column 1: Quality (Always shown)
             quality_text = self.get_quality_label(f)
             quality_item = QTableWidgetItem(quality_text)
-            # Set color based on quality (check English, Spanish, Portuguese, and Russian terms)
-            if any(term in quality_text for term in ["Best", "Óptima", "Mejor", "Melhor", "Лучшее"]):
+            # Set color based on quality (check English, Spanish, Portuguese, Russian, and Chinese terms)
+            if any(term in quality_text for term in ["Best", "Óptima", "Mejor", "Melhor", "Лучшее", "最佳"]):
                 quality_item.setForeground(QColor("#00ff00"))  # Green for best quality
-            elif any(term in quality_text for term in ["High", "Alta", "Alto", "Áudio Alto", "Audio Alto", "Высокое"]):
+            elif any(term in quality_text for term in ["High", "Alta", "Alto", "Áudio Alto", "Audio Alto", "Высокое", "高清", "高质量"]):
                 quality_item.setForeground(QColor("#00cc00"))  # Light green for high quality
-            elif any(term in quality_text for term in ["Medium", "Media", "Medio", "Média", "Áudio Médio", "Audio Medio", "Среднее"]):
+            elif any(term in quality_text for term in ["Medium", "Media", "Medio", "Média", "Áudio Médio", "Audio Medio", "Среднее", "中等"]):
                 quality_item.setForeground(QColor("#ffaa00"))  # Orange for medium quality
-            elif any(term in quality_text for term in ["Low", "Baja", "Bajo", "Baixa", "Áudio Baixo", "Audio Bajo", "Низкое"]):
+            elif any(term in quality_text for term in ["Low", "Baja", "Bajo", "Baixa", "Áudio Baixo", "Audio Bajo", "Низкое", "低质量"]):
                 quality_item.setForeground(QColor("#ff5555"))  # Red for low quality
             self.format_table.setItem(row, 1, quality_item)
 
diff --git a/src/utils/ytsage_localization.py b/src/utils/ytsage_localization.py
index 10c0b69..79a90bc 100644
--- a/src/utils/ytsage_localization.py
+++ b/src/utils/ytsage_localization.py
@@ -83,7 +83,8 @@ class LocalizationManager:
             "english": "English",
             "spanish": "Español (Spanish)",
             "portuguese": "Português (Portuguese)",
-            "russian": "Русский (Russian)"
+            "russian": "Русский (Russian)",
+            "chinese": "中文 (简体) (Chinese Simplified)"
         },
         "download": {
             "preparing": "🚀 Preparing your download...",