diff --git a/docs/guide/developer.md b/docs/guide/developer.md
index c194bba..c73da18 100644
--- a/docs/guide/developer.md
+++ b/docs/guide/developer.md
@@ -29,6 +29,22 @@ cp conf/live777.toml live777.toml
 cp conf/liveman.toml liveman.toml
 ```
 
+## Log
+
+Use `RUST_LOG` environment variable for set custom log level
+
+For `live777`, default log set
+
+```bash
+RUST_LOG=live777=<cfg.log.level>,net4mqtt=<cfg.log.level>,http_log=<cfg.log.level>,webrtc=error",
+```
+
+You can use this for override default log set
+
+```bash
+RUST_LOG=live777=error,net4mqtt=debug,webrtc=error",
+```
+
 ## Run in debug mode
 
 ### WebUI
diff --git a/docs/zh/guide/developer.md b/docs/zh/guide/developer.md
index c3cf837..a828479 100644
--- a/docs/zh/guide/developer.md
+++ b/docs/zh/guide/developer.md
@@ -29,6 +29,22 @@ cp conf/live777.toml live777.toml
 cp conf/liveman.toml liveman.toml
 ```
 
+## Log
+
+可以使用 `RUST_LOG` 环境变量来设置日志分模块输出
+
+比如 `live777`, 目前模块日志输出为：
+
+```bash
+RUST_LOG=live777=<cfg.log.level>,net4mqtt=<cfg.log.level>,http_log=<cfg.log.level>,webrtc=error",
+```
+
+我们可以用这个变量覆盖默认的日志输出方案
+
+```bash
+RUST_LOG=live777=error,net4mqtt=debug,webrtc=error",
+```
+
 ## 以开发模式运行
 
 ### WebUI
diff --git a/src/liveman.rs b/src/liveman.rs
index 99b10b0..30ecd10 100644
--- a/src/liveman.rs
+++ b/src/liveman.rs
@@ -20,7 +20,7 @@ async fn main() {
 
     #[cfg(debug_assertions)]
     log::set(format!(
-        "liveman={},liveion={},http_log={},webrtc=error",
+        "liveman={},net4mqtt={},http_log={},webrtc=error",
         cfg.log.level, cfg.log.level, cfg.log.level
     ));
 
diff --git a/src/main.rs b/src/main.rs
index 978891d..1f8a75a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -19,8 +19,8 @@ async fn main() {
     let cfg: liveion::config::Config = utils::load("live777".to_string(), args.config);
     cfg.validate().unwrap();
     log::set(format!(
-        "live777={},liveion={},http_log={},webrtc=error",
-        cfg.log.level, cfg.log.level, cfg.log.level
+        "live777={},liveion={},net4mqtt={},http_log={},webrtc=error",
+        cfg.log.level, cfg.log.level, cfg.log.level, cfg.log.level
     ));
     warn!("set log level : {}", cfg.log.level);
     debug!("config : {:?}", cfg);