diff --git a/example/main.go b/example/main.go
index c6a7ab3..ad26f46 100644
--- a/example/main.go
+++ b/example/main.go
@@ -15,6 +15,7 @@ func main() {
 		// loggerx.SetTimeZone(time.UTC),
 		loggerx.SetTimeZone(time.FixedZone("CST", 8*3600)),
 		loggerx.SetEscapeHTML(false),
+		// loggerx.SetExpandData("ddd", "dddd"),
 	)
 	log.WriteAsync().Info(ctx, "{ \"a\": 1, \"b\": 2 }")
 	log.Info(ctx, "哈哈哈2")
@@ -25,8 +26,19 @@ func main() {
 	log.Info(ctx, "哈哈哈2<")
 	log.Info(ctx, "哈哈哈2>")
 
-	for i := 0; i < 100; i++ {
-		log.WriteAsync().Infof(ctx, "异步 %d", i)
+	for i := 0; i < 10000; i++ {
+		go func() {
+			log.WriteAsync().Infof(ctx, "异步1 %d", i)
+		}()
+		go log.WriteAsync().Infof(ctx, "异步2 %d", i)
+		log.WriteAsync().Infof(ctx, "异步2 %d", i)
+	}
+	for i := 0; i < 10000; i++ {
+		go func() {
+			log.Infof(ctx, "同步1 %d", i)
+		}()
+		go log.Infof(ctx, "同步2 %d", i)
+		log.Infof(ctx, "同步3 %d", i)
 	}
 
 	time.Sleep(time.Second)
diff --git a/format.go b/format.go
index 2894c2d..64ee1f9 100644
--- a/format.go
+++ b/format.go
@@ -46,6 +46,7 @@ func (l *Logger) logger(ctx context.Context, event string, v ...any) {
 		Gid:     getGID(),
 		Content: v,
 		TraceId: traceId,
+		Expand: l.option.expandData,
 	}
 
 	if event == "error" {
@@ -85,4 +86,5 @@ type FormatData struct {
 	Content interface{} `json:"content,omitempty"`
 	TraceId string      `json:"traceId,omitempty"`
 	Stack   string      `json:"stack,omitempty"`
+	Expand map[string]string `json:"expand,omitempty"`
 }
diff --git a/options.go b/options.go
index b927370..6b72605 100644
--- a/options.go
+++ b/options.go
@@ -22,6 +22,7 @@ type loggerOption struct {
 	sizeSplit   int            // 根据文件大小切割
 	timeZone    *time.Location // 时区
 	escapeHTML  bool
+	expandData  map[string]string // 扩展字段
 }
 
 type writeType uint8
@@ -46,6 +47,7 @@ func defaultOptions() loggerOption {
 		fileSplit:   FileSplitTimeE,
 		timeZone:    time.Local,
 		escapeHTML:  true,
+		expandData:  make(map[string]string),
 	}
 }
 
@@ -58,6 +60,16 @@ func SetTraceField(traceField string) Option {
 	}
 }
 
+// 附加字段
+func SetExpandData(key string, value string) Option {
+	return func(o *loggerOption) {
+		if o.expandData == nil {
+			o.expandData = make(map[string]string)
+		}
+		o.expandData[key] = value
+	}
+}
+
 // 是否异步写入
 func SetWriteAsync() Option {
 	return func(o *loggerOption) {