diff --git a/config/option.go b/config/option.go
index d12b7f1..15a8302 100644
--- a/config/option.go
+++ b/config/option.go
@@ -35,6 +35,7 @@ type ConfigOptions struct {
 	GeoIPPath               string                `json:"geoip-path"`
 	GeoSitePath             string                `json:"geosite-path"`
 	Rules                   []Rule                `json:"rules"`
+	MuxOptions
 	TLSTricks
 }
 
@@ -47,6 +48,13 @@ type TLSTricks struct {
 	PaddingSize        string `json:"tls-padding-size"`
 }
 
+type MuxOptions struct {
+	EnableMux   bool   `json:"enable-mux"`
+	MuxPadding  bool   `json:"mux-padding"`
+	MaxStreams  int    `json:"mux-max-streams"`
+	MuxProtocol string `json:"mux-protocol"`
+}
+
 func DefaultConfigOptions() *ConfigOptions {
 	return &ConfigOptions{
 		ExecuteAsIs:             false,
@@ -76,6 +84,12 @@ func DefaultConfigOptions() *ConfigOptions {
 		GeoIPPath:               "geoip.db",
 		GeoSitePath:             "geosite.db",
 		Rules:                   []Rule{},
+		MuxOptions: MuxOptions{
+			EnableMux:   true,
+			MuxPadding:  true,
+			MaxStreams:  8,
+			MuxProtocol: "h2mux",
+		},
 		TLSTricks: TLSTricks{
 			EnableFragment:     false,
 			FragmentSize:       "10-100",
diff --git a/config/outbound.go b/config/outbound.go
index 8c1dc77..b55bca4 100644
--- a/config/outbound.go
+++ b/config/outbound.go
@@ -9,6 +9,8 @@ import (
 	"github.com/sagernet/sing-box/option"
 )
 
+type outboundMap map[string]interface{}
+
 func patchOutbound(base option.Outbound, configOpt ConfigOptions) (*option.Outbound, string, error) {
 	var serverDomain string
 	var outbound option.Outbound
@@ -22,7 +24,7 @@ func patchOutbound(base option.Outbound, configOpt ConfigOptions) (*option.Outbo
 		return nil, "", formatErr(err)
 	}
 
-	var obj map[string]interface{}
+	var obj outboundMap
 	err = json.Unmarshal(jsonData, &obj)
 	if err != nil {
 		return nil, "", formatErr(err)
@@ -64,6 +66,21 @@ func patchOutbound(base option.Outbound, configOpt ConfigOptions) (*option.Outbo
 		}
 	}
 
+	switch base.Type {
+	case C.TypeVMess, C.TypeVLESS, C.TypeTrojan, C.TypeShadowsocks:
+		if configOpt.EnableMux {
+			multiplex := option.OutboundMultiplexOptions{
+				Enabled:    true,
+				Padding:    configOpt.MuxPadding,
+				MaxStreams: configOpt.MaxStreams,
+				Protocol:   configOpt.MuxProtocol,
+			}
+			obj["multiplex"] = multiplex
+		} else {
+			delete(obj, "multiplex")
+		}
+	}
+
 	modifiedJson, err := json.Marshal(obj)
 	if err != nil {
 		return nil, "", formatErr(err)
@@ -76,3 +93,12 @@ func patchOutbound(base option.Outbound, configOpt ConfigOptions) (*option.Outbo
 
 	return &outbound, serverDomain, nil
 }
+
+// func (o outboundMap) transportType() string {
+// 	if transport, ok := o["transport"].(map[string]interface{}); ok {
+// 		if transportType, ok := transport["type"].(string); ok {
+// 			return transportType
+// 		}
+// 	}
+// 	return ""
+// }