diff --git a/README.md b/README.md
index 478d7ac..f2e5abd 100644
--- a/README.md
+++ b/README.md
@@ -203,6 +203,10 @@ Open `http://localhost:18765` → everything is managed from the Web dashboard.
 
 See [DISCLAIMER.md](DISCLAIMER.md) and [PRIVACY.md](PRIVACY.md) for details.
 
+## FAQ
+
+Having trouble? Check the **[FAQ (English)](faq-en.md)** | **[常见问题 (中文)](faq.md)** for solutions to common issues.
+
 ## Community
 
 - Telegram Chat: [t.me/openrelay_chat](https://t.me/openrelay_chat)
@@ -361,6 +365,10 @@ openrelay --test    # 测试所有 Provider 连接
 
 详见 [DISCLAIMER.md](DISCLAIMER.md) 和 [PRIVACY.md](PRIVACY.md)。
 
+## 常见问题
+
+遇到问题？查看 **[常见问题 (中文)](faq.md)** | **[FAQ (English)](faq-en.md)**。
+
 ## 社区
 
 - Telegram 讨论群：[t.me/openrelay_chat](https://t.me/openrelay_chat)
diff --git a/faq-en.md b/faq-en.md
new file mode 100644
index 0000000..ebb57f6
--- /dev/null
+++ b/faq-en.md
@@ -0,0 +1,227 @@
+# OpenRelay FAQ (Frequently Asked Questions)
+
+> Check here first when you run into issues. If your question isn't covered, please open a [GitHub Issue](https://github.com/romgX/openrelay/issues).
+
+---
+
+## Table of Contents
+
+1. [Installation & Startup](#installation--startup)
+2. [Connection & Configuration](#connection--configuration)
+3. [Providers & Quotas](#providers--quotas)
+4. [Error Troubleshooting](#error-troubleshooting)
+5. [IDE Integration](#ide-integration)
+
+---
+
+## Installation & Startup
+
+### Q: How do I install OpenRelay?
+
+Download the latest release from GitHub: https://github.com/romgX/openrelay/releases
+
+Supported platforms: macOS (arm64/x64), Windows (x64).
+
+The binary release requires no Node.js. Running from source requires Node.js >= 18.
+
+### Q: How do I start it?
+
+```bash
+openrelay start
+```
+
+Check status:
+
+```bash
+openrelay status
+```
+
+Default port: `18765`.
+
+### Q: How do I set it to start on boot?
+
+macOS:
+
+```bash
+openrelay service install
+```
+
+This creates a LaunchAgent that starts automatically after login.
+
+---
+
+## Connection & Configuration
+
+### Q: How do I connect Claude Code?
+
+Option 1: One-click setup
+
+```bash
+openrelay config set-app claude-code claude-sonnet-4-6
+```
+
+Option 2: Set environment variables manually
+
+```bash
+export ANTHROPIC_BASE_URL=http://localhost:18765
+export ANTHROPIC_API_KEY=unused
+```
+
+### Q: How do I connect Cursor / Windsurf / Cline?
+
+```bash
+openrelay config set-app cursor claude-sonnet-4-6
+openrelay config set-app windsurf claude-sonnet-4-6
+```
+
+Or set the API Base URL to `http://localhost:18765` in your IDE settings.
+
+### Q: How do I view current configuration?
+
+```bash
+openrelay config list
+```
+
+---
+
+## Providers & Quotas
+
+### Q: How do I add free providers?
+
+```bash
+openrelay provider add
+```
+
+Interactive setup will guide you. Recommended free providers:
+- **Groq** — 14,400 req/day, Llama 3.3 70B, extremely fast
+- **Cerebras** — 1M tokens/day, Llama 70B
+- **Google AI Studio** — Gemini series, generous free tier
+- **SambaNova** — Llama 405B, 200K tokens/day
+
+### Q: What happens when free quota runs out?
+
+OpenRelay automatically fails over to the next available provider. If all providers are rate-limited, they'll recover in a few minutes. We recommend registering multiple providers for better reliability.
+
+### Q: How do I check provider status?
+
+```bash
+openrelay provider list
+```
+
+Or open the Web dashboard at `http://localhost:18765`.
+
+---
+
+## Error Troubleshooting
+
+### Q: `impit not available (Cannot find module 'impit/index.wrapper.js')`
+
+**This is a normal informational message, not an error.**
+
+impit is an optional Chrome TLS fingerprint library used to bypass CloudFlare JA3/JA4 detection. Without it, OpenRelay automatically falls back to native fetch — **everything works normally**.
+
+You do NOT need to install impit manually. Only relevant if you encounter persistent 403 errors with the Claude Desktop provider.
+
+### Q: `connection refused localhost:18765`
+
+OpenRelay is not running. Start it:
+
+```bash
+openrelay start
+```
+
+If already started but still getting errors, check if the port is in use:
+
+```bash
+lsof -i :18765
+```
+
+### Q: `401 Unauthorized`
+
+API key expired or invalid. Check your provider keys:
+
+```bash
+openrelay config list
+```
+
+If it's a Claude Code OAuth token expiration:
+
+```bash
+claude auth login
+```
+
+OpenRelay will automatically pick up the new token after re-authentication.
+
+### Q: `rate limit exceeded`
+
+Current provider quota is exhausted. OpenRelay automatically switches to the next available provider.
+
+If all providers are rate-limited:
+1. Wait a few minutes and retry
+2. Add more providers: `openrelay provider add`
+3. Check if any provider keys have expired: `openrelay provider list`
+
+### Q: `403 Forbidden` (CloudFlare block)
+
+Some providers (e.g., Claude Desktop) use CloudFlare protection. OpenRelay automatically refreshes cookies and retries.
+
+If 403 persists:
+1. Check if impit is loaded (look in startup logs)
+2. Try restarting: `openrelay restart`
+3. Clear cookie cache and retry
+
+### Q: `ECONNRESET` or `socket hang up`
+
+Network instability or provider-side disconnection. Usually temporary — OpenRelay retries automatically.
+
+If it happens frequently:
+1. Check your network connection
+2. Check if you need a proxy (`openrelay config set proxy http://...`)
+3. Switch to a different provider
+
+### Q: `EADDRINUSE` on startup
+
+Port 18765 is already in use. Another OpenRelay instance may be running:
+
+```bash
+openrelay status
+# If it shows running, no need to start again
+
+# To force restart
+openrelay restart
+```
+
+---
+
+## IDE Integration
+
+### Q: Claude Code shows `model not found`
+
+Confirm OpenRelay is running and the model name is correct:
+
+```bash
+openrelay status
+curl http://localhost:18765/v1/models
+```
+
+Make sure environment variables are set correctly (`ANTHROPIC_BASE_URL` and `ANTHROPIC_API_KEY`).
+
+### Q: Cursor can't connect to OpenRelay
+
+1. Confirm OpenRelay is running: `openrelay status`
+2. In Cursor Settings → Models:
+   - API Base URL: `http://localhost:18765/v1`
+   - API Key: `unused` (any value works)
+3. Test connection: `curl http://localhost:18765/v1/models`
+
+### Q: Responses are very slow
+
+1. Check which provider/model is in use — larger models (e.g., 405B) are slower
+2. Switch to faster providers (Groq and Cerebras are the fastest)
+3. Check network latency (`ping` the provider's domain)
+
+---
+
+> Last updated: 2026-03-11
+>
+> If your question isn't listed here, please open a [GitHub Issue](https://github.com/romgX/openrelay/issues) and we'll add it to this FAQ.
diff --git a/faq.md b/faq.md
new file mode 100644
index 0000000..341c30d
--- /dev/null
+++ b/faq.md
@@ -0,0 +1,229 @@
+# OpenRelay 常见问题与解答 (FAQ)
+
+> 遇到问题先查这里。如果未解决，请到 [GitHub Issues](https://github.com/romgX/openrelay/issues) 提问。
+>
+> 维护说明：发现新的用户问题时，及时更新本文档。
+
+---
+
+## 目录
+
+1. [安装与启动](#安装与启动)
+2. [连接与配置](#连接与配置)
+3. [Provider 与配额](#provider-与配额)
+4. [报错排查](#报错排查)
+5. [IDE 集成](#ide-集成)
+
+---
+
+## 安装与启动
+
+### Q: 怎么安装 OpenRelay？
+
+从 GitHub 下载最新版本：https://github.com/romgX/openrelay/releases
+
+支持平台：macOS (arm64/x64)、Windows (x64)。
+
+打包版本不需要 Node.js；源码运行需要 Node.js >= 18。
+
+### Q: 怎么启动？
+
+```bash
+openrelay start
+```
+
+检查运行状态：
+
+```bash
+openrelay status
+```
+
+默认监听端口：`18765`。
+
+### Q: 怎么设置开机自启？
+
+macOS：
+
+```bash
+openrelay service install
+```
+
+会创建 LaunchAgent，登录后自动启动。
+
+---
+
+## 连接与配置
+
+### Q: 怎么连接 Claude Code？
+
+方法一：一键配置
+
+```bash
+openrelay config set-app claude-code claude-sonnet-4-6
+```
+
+方法二：手动设置环境变量
+
+```bash
+export ANTHROPIC_BASE_URL=http://localhost:18765
+export ANTHROPIC_API_KEY=unused
+```
+
+### Q: 怎么连接 Cursor / Windsurf / Cline？
+
+```bash
+openrelay config set-app cursor claude-sonnet-4-6
+openrelay config set-app windsurf claude-sonnet-4-6
+```
+
+或在对应 IDE 的设置中，将 API Base URL 指向 `http://localhost:18765`。
+
+### Q: 怎么查看当前配置？
+
+```bash
+openrelay config list
+```
+
+---
+
+## Provider 与配额
+
+### Q: 怎么添加免费 Provider？
+
+```bash
+openrelay provider add
+```
+
+交互式引导添加。推荐优先添加：
+- **Groq** — 14,400 次/天，Llama 3.3 70B，速度极快
+- **Cerebras** — 100万 token/天，Llama 70B
+- **Google AI Studio** — Gemini 系列，免费额度大
+- **SambaNova** — Llama 405B，200K token/天
+
+### Q: 免费配额用完了怎么办？
+
+OpenRelay 会自动切换到下一个可用 Provider（failover）。如果所有 Provider 都限流，等几分钟后会自动恢复。建议多注册几个 Provider，配额叠加更稳。
+
+### Q: 怎么查看各 Provider 状态？
+
+```bash
+openrelay provider list
+```
+
+或打开 Web 管理面板：`http://localhost:18765`。
+
+---
+
+## 报错排查
+
+### Q: `impit not available (Cannot find module 'impit/index.wrapper.js')`
+
+**这是正常的提示信息，不是错误。**
+
+impit 是可选的 Chrome TLS 指纹模拟库，用于绕过 CloudFlare 的 JA3/JA4 检测。没有它，OpenRelay 会自动降级到原生 fetch，**不影响正常使用**。
+
+不需要手动安装 impit。只有在使用 Claude Desktop provider 时遇到持续 403 错误才需要关注。
+
+### Q: `connection refused localhost:18765`
+
+OpenRelay 没有运行。启动它：
+
+```bash
+openrelay start
+```
+
+如果已经启动但仍报错，检查端口是否被占用：
+
+```bash
+lsof -i :18765
+```
+
+### Q: `401 Unauthorized`
+
+API Key 过期或无效。检查对应 Provider 的 Key：
+
+```bash
+openrelay config list
+```
+
+如果是 Claude Code 的 OAuth token 过期：
+
+```bash
+claude auth login
+```
+
+重新认证后，OpenRelay 会自动读取新 token。
+
+### Q: `rate limit exceeded`
+
+当前 Provider 配额用完了。OpenRelay 会自动切换到下一个可用 Provider。
+
+如果所有 Provider 都限流：
+1. 等几分钟后重试
+2. 添加更多 Provider：`openrelay provider add`
+3. 检查是否有 Provider 的 Key 失效了：`openrelay provider list`
+
+### Q: `403 Forbidden`（CloudFlare 拦截）
+
+部分 Provider（如 Claude Desktop）使用 CloudFlare 防护。OpenRelay 会自动刷新 Cookie 并重试。
+
+如果持续 403：
+1. 确认 impit 是否已加载（启动日志中查看）
+2. 尝试重启 OpenRelay：`openrelay restart`
+3. 清除 Cookie 缓存后重试
+
+### Q: `ECONNRESET` 或 `socket hang up`
+
+网络不稳定或 Provider 服务端断开连接。通常是临时问题，OpenRelay 会自动重试。
+
+如果频繁出现：
+1. 检查网络连接
+2. 检查是否需要代理（`openrelay config set proxy http://...`）
+3. 切换到其他 Provider
+
+### Q: 启动时报 `EADDRINUSE`
+
+端口 18765 已被占用。可能是另一个 OpenRelay 实例在运行：
+
+```bash
+openrelay status
+# 如果显示已运行，不需要再次启动
+
+# 如果要强制重启
+openrelay restart
+```
+
+---
+
+## IDE 集成
+
+### Q: Claude Code 显示 `model not found`
+
+确认 OpenRelay 已启动且模型名称正确：
+
+```bash
+openrelay status
+curl http://localhost:18765/v1/models
+```
+
+确保环境变量设置正确（`ANTHROPIC_BASE_URL` 和 `ANTHROPIC_API_KEY`）。
+
+### Q: Cursor 连不上 OpenRelay
+
+1. 确认 OpenRelay 已启动：`openrelay status`
+2. 在 Cursor Settings → Models 中设置：
+   - API Base URL: `http://localhost:18765/v1`
+   - API Key: `unused`（任意值即可）
+3. 测试连接：`curl http://localhost:18765/v1/models`
+
+### Q: 响应速度很慢
+
+1. 检查当前使用的 Provider 和模型：大模型（如 405B）比小模型慢
+2. 切换到速度更快的 Provider（Groq、Cerebras 速度最快）
+3. 检查网络延迟（`ping` 对应 Provider 的域名）
+
+---
+
+> 最后更新：2026-03-11
+>
+> 如果你的问题不在列表中，请到 [GitHub Issues](https://github.com/romgX/openrelay/issues) 提问，我们会及时补充到本文档。