1. 通过配置文件强制输出语言（.qwen/output-language.md）

Qwen 编码助手（qwen-code）支持通过项目根目录下的 .qwen/output-language.md 配置文件来强制锁定输出语言，无需每次在 prompt 中重复声明。

安装步骤：在项目根目录创建 .qwen/output-language.md，写入以下内容即可生效：

# Output language preference: Chinese

<!-- qwen-code:llm-output-language: Chinese -->

## Rule
You MUST always respond in **Chinese** regardless of the user's input language.

This is a mandatory requirement, not a preference.

## Thinking / Reasoning
All internal thinking and reasoning (思考过程) MUST also be in **Chinese**.

## Exception
If the user **explicitly** requests a response in a specific language (e.g., "please reply in English"), switch to the user's requested language for the remainder of the conversation.

## Keep technical artifacts unchanged
Do **not** translate or rewrite:
- Code blocks, CLI commands, file paths, stack traces, logs, JSON keys, identifiers
- Exact quoted text from the user (keep quotes verbatim)

## Tool / system outputs
Raw tool/system outputs may contain fixed-format English. Preserve them verbatim, and if needed, add a short **Chinese** explanation below.

将文件中的 Chinese 替换为 English等其他语言名称，即可切换默认输出语言。配置文件保存后立即生效，无需额外参数。

2. 总结

Qwen 模型的 output_language 参数为多语言应用开发提供了便利。通过合理配置，你可以确保模型输出符合目标用户的语言习惯，提升用户体验。建议开发者根据实际需求选择合适的语言设置策略，并在关键场景中添加语言检测和验证逻辑。

提示：本文基于 Qwen 模型最新文档编写，具体实现可能随版本更新而变化，请以官方文档为准。