diff --git a/backend/apps/chat/task/llm.py b/backend/apps/chat/task/llm.py
index dd314fd0..4193029d 100644
--- a/backend/apps/chat/task/llm.py
+++ b/backend/apps/chat/task/llm.py
@@ -1832,6 +1832,8 @@ def get_lang_name(lang: str):
     if not lang:
         return '简体中文'
     normalized = lang.lower()
+    if normalized.startswith('zh-tw'):
+        return '繁体中文'
     if normalized.startswith('en'):
         return '英文'
     if normalized.startswith('ko'):
diff --git a/backend/apps/system/api/user.py b/backend/apps/system/api/user.py
index 84e72962..58033543 100644
--- a/backend/apps/system/api/user.py
+++ b/backend/apps/system/api/user.py
@@ -273,7 +273,7 @@ async def batch_del(session: SessionDep, id_list: list[int]):
 @clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="current_user.id")
 async def langChange(session: SessionDep, current_user: CurrentUser, trans: Trans, language: UserLanguage):
     lang = language.language
-    if lang not in ["zh-CN", "en", "ko-KR"]:
+    if lang not in ["zh-CN", "zh-TW", "en", "ko-KR"]:
         raise Exception(trans('i18n_user.language_not_support', key = lang))
     db_user: UserModel = get_db_user(session=session, user_id=current_user.id)
     db_user.language = lang
diff --git a/backend/apps/system/schemas/system_schema.py b/backend/apps/system/schemas/system_schema.py
index 5be16668..87b1a41d 100644
--- a/backend/apps/system/schemas/system_schema.py
+++ b/backend/apps/system/schemas/system_schema.py
@@ -32,7 +32,7 @@ class BaseUser(BaseModel):
 
 
 class BaseUserDTO(BaseUser, BaseCreatorDTO):
-    language: str = Field(pattern=r"^(zh-CN|en|ko-KR)$", default="zh-CN", description="用户语言")
+    language: str = Field(pattern=r"^(zh-CN|zh-TW|en|ko-KR)$", default="zh-CN", description="用户语言")
     password: str
     status: int = 1
     origin: int = 0
@@ -47,8 +47,8 @@ def to_dict(self):
 
     @field_validator("language")
     def validate_language(cls, lang: str) -> str:
-        if not re.fullmatch(r"^(zh-CN|en|ko-KR)$", lang):
-            raise ValueError("Language must be 'zh-CN', 'en', or 'ko-KR'")
+        if not re.fullmatch(r"^(zh-CN|zh-TW|en|ko-KR)$", lang):
+            raise ValueError("Language must be 'zh-CN', 'zh-TW', 'en', or 'ko-KR'")
         return lang
 
 
diff --git a/backend/locales/zh-TW.json b/backend/locales/zh-TW.json
new file mode 100644
index 00000000..0bb90867
--- /dev/null
+++ b/backend/locales/zh-TW.json
@@ -0,0 +1,197 @@
+{
+  "i18n_default_workspace": "默認工作空間",
+  "i18n_ds_name_exist": "名稱已存在",
+  "i18n_concat_admin": "請聯繫管理員！",
+  "i18n_exist": "{msg}已存在！",
+  "i18n_name": "名稱",
+  "i18n_not_exist": "{msg}不存在！",
+  "i18n_error": "{key}錯誤！",
+  "i18n_miss_args": "缺失{key}參數！",
+  "i18n_format_invalid": "{key}格式不正確！",
+  "i18n_login": {
+    "account_pwd_error": "帳號或密碼錯誤！",
+    "no_associated_ws": "沒有關聯的工作空間，{msg}",
+    "user_disable": "帳號已禁用，{msg}",
+    "origin_error": "登入方式錯誤",
+    "prohibit_auto_create": "禁止自動建立用戶，請先同步用戶",
+    "no_platform_user": "帳號不存在，請先同步用戶"
+  },
+  "i18n_user": {
+    "account": "帳號",
+    "email": "郵箱",
+    "password": "密碼",
+    "language_not_support": "系統不支援[{key}]語言！",
+    "ws_miss": "當前用戶不在工作空間[{ws}]中！",
+    "name": "姓名",
+    "status": "用戶狀態",
+    "origin": "用戶來源",
+    "workspace": "工作空間",
+    "role": "角色",
+    "platform_user_id": "外部用戶唯一標識",
+    "administrator": "管理員",
+    "ordinary_member": "普通成員",
+    "status_enabled": "已啟用",
+    "status_disabled": "已禁用",
+    "local_creation": "本地建立"
+  },
+  "i18n_ws": {
+    "title": "工作空間"
+  },
+  "i18n_permission": {
+    "only_admin": "僅支援管理員調用！",
+    "no_permission": "無權調用{url}{msg}",
+    "authenticate_invalid": "認證無效【{msg}】",
+    "token_expired": "Token 已過期",
+    "only_ws_admin": "僅支援工作空間管理員調用！",
+    "permission_resource_limit": "沒有操作權限或資源不存在！"
+  },
+  "i18n_llm": {
+    "validate_error": "校驗失敗[{msg}]",
+    "delete_default_error": "無法刪除默認模型[{key}]！",
+    "miss_default": "尚未配置默認大語言模型"
+  },
+  "i18n_ds_invalid": "數據源連接無效",
+  "i18n_embedded": {
+    "invalid_origin": "網域校驗失敗【{origin}】"
+  },
+  "i18n_chat": {
+    "record_id_in_mcp": "響應ID: "
+  },
+  "i18n_terminology": {
+    "terminology_not_exists": "該術語不存在",
+    "datasource_cannot_be_none": "數據源不能為空",
+    "cannot_be_repeated": "術語名稱，同義詞不能重複",
+    "exists_in_db": "術語名稱，同義詞已存在",
+    "term_name": "術語名稱",
+    "term_description": "術語描述",
+    "effective_data_sources": "生效數據源",
+    "all_data_sources": "所有數據源",
+    "synonyms": "同義詞",
+    "term_name_template": "術語名稱（必填）",
+    "term_description_template": "術語描述（必填）",
+    "effective_data_sources_template": "生效數據源（支援多個，用\",\"分割）",
+    "all_data_sources_template": "所有數據源（Y：應用到全部數據源，N：應用到指定數據源）",
+    "synonyms_template": "同義詞（支援多個，用\",\"分割）",
+    "term_name_template_example_1": "術語1",
+    "term_description_template_example_1": "術語1描述",
+    "effective_data_sources_template_example_1": "生效數據源1, 生效數據源2",
+    "synonyms_template_example_1": "同義詞1, 同義詞2",
+    "term_name_template_example_2": "術語2",
+    "term_description_template_example_2": "術語2描述",
+    "synonyms_template_example_2": "同義詞3",
+    "word_cannot_be_empty": "術語名稱不能為空",
+    "description_cannot_be_empty": "術語描述不能為空",
+    "datasource_not_found": "找不到數據源"
+  },
+  "i18n_data_training": {
+    "datasource_list_is_not_found": "數據源列表未找到",
+    "datasource_id_not_found": "數據源ID: {key} 未找到",
+    "datasource_cannot_be_none": "數據源不能為空",
+    "datasource_assistant_cannot_be_none": "數據源或高級應用不能都為空",
+    "data_training_not_exists": "該範例不存在",
+    "exists_in_db": "該問題已存在",
+    "data_training": "SQL 範例庫",
+    "problem_description": "問題描述",
+    "sample_sql": "範例 SQL",
+    "effective_data_sources": "生效數據源",
+    "advanced_application": "高級應用",
+    "problem_description_template": "問題描述（必填）",
+    "sample_sql_template": "範例 SQL（必填）",
+    "effective_data_sources_template": "生效數據源",
+    "advanced_application_template": "高級應用",
+    "problem_description_template_example": "查詢TEST表內所有ID",
+    "effective_data_sources_template_example": "生效數據源1",
+    "advanced_application_template_example": "生效高級應用名稱",
+    "error_info": "錯誤訊息",
+    "question_cannot_be_empty": "問題不能為空",
+    "description_cannot_be_empty": "範例 SQL 不能為空",
+    "datasource_not_found": "找不到數據源",
+    "advanced_application_not_found": "找不到高級應用"
+  },
+  "i18n_custom_prompt": {
+    "exists_in_db": "模版名稱已存在",
+    "not_exists": "該模版不存在",
+    "prompt_word_name": "提示詞名稱",
+    "prompt_word_content": "提示詞內容",
+    "effective_data_sources": "生效數據源",
+    "all_data_sources": "所有數據源",
+    "prompt_word_name_template": "提示詞名稱（必填）",
+    "prompt_word_content_template": "提示詞內容（必填）",
+    "effective_data_sources_template": "生效數據源（支援多個，用\",\"分割）",
+    "all_data_sources_template": "所有數據源（Y：應用到全部數據源，N：應用到指定數據源）",
+    "prompt_word_name_template_example1": "提示詞1",
+    "prompt_word_content_template_example1": "詳細描述你的提示詞",
+    "effective_data_sources_template_example1": "生效數據源1, 生效數據源2",
+    "prompt_word_name_template_example2": "提示詞2",
+    "prompt_word_content_template_example2": "詳細描述你的提示詞",
+    "name_cannot_be_empty": "名稱不能為空",
+    "prompt_cannot_be_empty": "提示詞內容不能為空",
+    "type_cannot_be_empty": "類型不能為空",
+    "datasource_not_found": "找不到數據源",
+    "datasource_cannot_be_none": "數據源不能為空"
+  },
+  "i18n_excel_export": {
+    "data_is_empty": "表單數據為空，無法導出數據"
+  },
+  "i18n_excel_import": {
+    "col_num_not_match": "EXCEL列數量不匹配"
+  },
+  "i18n_authentication": {
+    "record_not_exist": "{msg} 記錄不存在，請先儲存！"
+  },
+  "i18n_audit": {
+    "success": "成功",
+    "failed": "失敗",
+    "system_log": "操作日誌",
+    "operation_type_name": "操作類型",
+    "operation_detail_info": "操作詳情",
+    "user_name": "操作用戶",
+    "oid_name": "工作空間",
+    "operation_status_name": "操作狀態",
+    "error_message": "錯誤訊息",
+    "ip_address": "IP 地址",
+    "create_time": "操作時間",
+    "chat": "智能問數",
+    "datasource": "數據源",
+    "dashboard": "儀表板",
+    "member": "成員",
+    "permission": "權限",
+    "terminology": "術語",
+    "data_training": "SQL 範例庫",
+    "prompt_words": "提示詞",
+    "user": "用戶",
+    "workspace": "工作空間",
+    "ai_model": "AI 模型",
+    "application": "應用",
+    "theme": "外觀配置",
+    "create": "新建",
+    "delete": "刪除",
+    "update": "更新",
+    "edit": "編輯",
+    "login": "登入",
+    "export": "匯出",
+    "import": "匯入",
+    "add": "新增",
+    "create_or_update": "變更",
+    "api_key": "API Key",
+    "params_setting": "參數配置",
+    "rules": "權限規則",
+    "log_setting": "登入認證",
+    "setting": "設定",
+    "system_management": "系統管理",
+    "opt_log": "操作日誌",
+    "prediction": "數據預測",
+    "analysis": "數據分析",
+    "reset_pwd": "重置密碼",
+    "update_pwd": "更新密碼",
+    "update_status": "更新狀態",
+    "update_table_relation": "變更表關係"
+  },
+  "i18n_table_not_exist": "當前表不存在",
+  "i18n_variable": {
+    "name_exist": "變數名稱已存在",
+    "name": "姓名",
+    "account": "帳號",
+    "email": "郵箱"
+  }
+}
\ No newline at end of file