diff --git a/logging/slog/logger.go b/logging/slog/logger.go
index 8f19bf8..500a2b4 100644
--- a/logging/slog/logger.go
+++ b/logging/slog/logger.go
@@ -2,6 +2,7 @@ package slog
 
 import (
 	"fmt"
+	"io"
 	"log/slog"
 )
 
@@ -71,3 +72,14 @@ func (w *Writer) Logger() *slog.Logger {
 func (w *Writer) Printf(format string, v ...interface{}) {
 	w.log.Info(fmt.Sprintf(format, v...))
 }
+
+func (w *Writer) SetLvel(level slog.Level) {
+	w.config.coreConfig.level.Set(level)
+	w.config.coreConfig.withLevel = true
+}
+
+func (w *Writer) SetOutput(writer io.Writer) {
+	log := slog.New(NewTraceHandler(writer, w.config.coreConfig.opt, w.config.traceConfig))
+	w.config.coreConfig.writer = writer
+	w.log = log
+}
diff --git a/logging/slog/logger_test.go b/logging/slog/logger_test.go
index 24b8e70..c8a9015 100644
--- a/logging/slog/logger_test.go
+++ b/logging/slog/logger_test.go
@@ -81,7 +81,7 @@ func TestLogger(t *testing.T) {
 	errSpan.End()
 }
 
-func TestLogger1(t *testing.T) {
+func TestLoggerBase(t *testing.T) {
 	ctx := context.Background()
 
 	buf := new(bytes.Buffer)
@@ -89,17 +89,13 @@ func TestLogger1(t *testing.T) {
 	shutdown := stdoutProvider(ctx)
 	defer shutdown()
 
-	logger := logger.New(
-		NewWriter(
-			WithTraceErrorSpanLevel(slog.LevelWarn),
-			WithRecordStackTraceInSpan(true),
-		), logger.Config{
-			SlowThreshold: time.Millisecond,
-			LogLevel:      logger.Warn,
-			Colorful:      false,
-		})
+	logger := NewWriter(
+		WithTraceErrorSpanLevel(slog.LevelWarn),
+		WithOutput(buf),
+		WithRecordStackTraceInSpan(true),
+	)
 
-	logger.Info(ctx, "log from origin slog")
+	logger.log.InfoContext(ctx, "log from origin slog")
 	assert.True(t, strings.Contains(buf.String(), "log from origin slog"))
 	buf.Reset()
 
@@ -107,9 +103,11 @@ func TestLogger1(t *testing.T) {
 
 	ctx, span := tracer.Start(ctx, "root")
 
-	assert.True(t, strings.Contains(buf.String(), "trace_id"))
-	assert.True(t, strings.Contains(buf.String(), "span_id"))
-	assert.True(t, strings.Contains(buf.String(), "trace_flags"))
+	// TODO fix it
+	logger.log.WarnContext(ctx, "hello world")
+	assert.True(t, strings.Contains(buf.String(), "TraceID"))
+	assert.True(t, strings.Contains(buf.String(), "SpanID"))
+	assert.True(t, strings.Contains(buf.String(), "TraceFlags"))
 	buf.Reset()
 
 	span.End()
@@ -131,14 +129,12 @@ func TestLogLevel(t *testing.T) {
 		WithRecordStackTraceInSpan(true),
 	)
 
-	/*	// output to buffer
-		logger.SetOutput(buf)
+	logger.SetOutput(buf)
+	logger.log.Debug("this is a debug log")
+	assert.False(t, strings.Contains(buf.String(), "this is a debug log"))
 
-		logger.Debug("this is a debug log")
-		assert.False(t, strings.Contains(buf.String(), "this is a debug log"))
+	logger.SetLvel(slog.LevelDebug)
 
-		logger.SetLevel(klog.LevelDebug)
-	*/
 	logger.log.Debug("this is a debug log msg")
 	assert.True(t, strings.Contains(buf.String(), "this is a debug log"))
 }