diff --git a/listener/inbound/mux_test.go b/listener/inbound/mux_test.go
new file mode 100644
index 00000000..32ba12c7
--- /dev/null
+++ b/listener/inbound/mux_test.go
@@ -0,0 +1,41 @@
+package inbound_test
+
+import (
+	"testing"
+
+	"github.com/metacubex/mihomo/adapter/outbound"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var singMuxProtocolList = []string{"h2mux", "smux"} // don't test "yamux" because it has some confused bugs
+
+// notCloseProxyAdapter is a proxy adapter that does not close the underlying outbound.ProxyAdapter.
+// The outbound.SingMux will close the underlying outbound.ProxyAdapter when it is closed, but we don't want to close it.
+// The underlying outbound.ProxyAdapter should only be closed by the caller of testSingMux.
+type notCloseProxyAdapter struct {
+	outbound.ProxyAdapter
+}
+
+func (n *notCloseProxyAdapter) Close() error {
+	return nil
+}
+
+func testSingMux(t *testing.T, tunnel *TestTunnel, out outbound.ProxyAdapter) {
+	t.Run("singmux", func(t *testing.T) {
+		for _, protocol := range singMuxProtocolList {
+			t.Run(protocol, func(t *testing.T) {
+				t.Parallel()
+				singMuxOption := outbound.SingMuxOption{
+					Enabled:  true,
+					Protocol: protocol,
+				}
+				out, err := outbound.NewSingMux(singMuxOption, &notCloseProxyAdapter{out})
+				assert.NoError(t, err)
+				defer out.Close()
+
+				tunnel.DoTest(t, out)
+			})
+		}
+	})
+}
diff --git a/listener/inbound/shadowsocks_test.go b/listener/inbound/shadowsocks_test.go
index 34772a21..a957886b 100644
--- a/listener/inbound/shadowsocks_test.go
+++ b/listener/inbound/shadowsocks_test.go
@@ -77,6 +77,8 @@ func testInboundShadowSocks0(t *testing.T, inboundOptions inbound.ShadowSocksOpt
 	defer out.Close()
 
 	tunnel.DoTest(t, out)
+
+	testSingMux(t, tunnel, out)
 }
 
 func TestInboundShadowSocks_Basic(t *testing.T) {
diff --git a/listener/inbound/trojan_test.go b/listener/inbound/trojan_test.go
index 971a25c7..cfc4476d 100644
--- a/listener/inbound/trojan_test.go
+++ b/listener/inbound/trojan_test.go
@@ -42,6 +42,8 @@ func testInboundTrojan(t *testing.T, inboundOptions inbound.TrojanOption, outbou
 	defer out.Close()
 
 	tunnel.DoTest(t, out)
+
+	testSingMux(t, tunnel, out)
 }
 
 func TestInboundTrojan_TLS(t *testing.T) {
diff --git a/listener/inbound/vless_test.go b/listener/inbound/vless_test.go
index f1e37ac5..a307753b 100644
--- a/listener/inbound/vless_test.go
+++ b/listener/inbound/vless_test.go
@@ -42,6 +42,8 @@ func testInboundVless(t *testing.T, inboundOptions inbound.VlessOption, outbound
 	defer out.Close()
 
 	tunnel.DoTest(t, out)
+
+	testSingMux(t, tunnel, out)
 }
 
 func TestInboundVless_TLS(t *testing.T) {
diff --git a/listener/inbound/vmess_test.go b/listener/inbound/vmess_test.go
index aa877861..3456d1fd 100644
--- a/listener/inbound/vmess_test.go
+++ b/listener/inbound/vmess_test.go
@@ -44,6 +44,8 @@ func testInboundVMess(t *testing.T, inboundOptions inbound.VmessOption, outbound
 	defer out.Close()
 
 	tunnel.DoTest(t, out)
+
+	testSingMux(t, tunnel, out)
 }
 
 func TestInboundVMess_Basic(t *testing.T) {
diff --git a/listener/sing/sing.go b/listener/sing/sing.go
index eb13e6c9..af7cdbc9 100644
--- a/listener/sing/sing.go
+++ b/listener/sing/sing.go
@@ -72,7 +72,7 @@ func NewListenerHandler(lc ListenerConfig) (h *ListenerHandler, err error) {
 		NewStreamContext: func(ctx context.Context, conn net.Conn) context.Context {
 			return ctx
 		},
-		Logger:  log.SingLogger,
+		Logger:  log.SingInfoToDebugLogger, // convert sing-mux info log to debug
 		Handler: h,
 		Padding: lc.MuxOption.Padding,
 		Brutal: mux.BrutalOptions{
diff --git a/log/sing.go b/log/sing.go
index 818acc79..7fdd3f12 100644
--- a/log/sing.go
+++ b/log/sing.go
@@ -65,4 +65,17 @@ func (l singLogger) Panic(args ...any) {
 	Fatalln(fmt.Sprint(args...))
 }
 
+type singInfoToDebugLogger struct {
+	singLogger
+}
+
+func (l singInfoToDebugLogger) InfoContext(ctx context.Context, args ...any) {
+	Debugln(fmt.Sprint(args...))
+}
+
+func (l singInfoToDebugLogger) Info(args ...any) {
+	Debugln(fmt.Sprint(args...))
+}
+
 var SingLogger L.ContextLogger = singLogger{}
+var SingInfoToDebugLogger L.ContextLogger = singInfoToDebugLogger{}