diff --git a/adapter/adapter.go b/adapter/adapter.go
index aa860ed4..feef72be 100644
--- a/adapter/adapter.go
+++ b/adapter/adapter.go
@@ -92,6 +92,7 @@ func (p *Proxy) MarshalJSON() ([]byte, error) {
 	mapping["history"] = p.DelayHistory()
 	mapping["name"] = p.Name()
 	mapping["udp"] = p.SupportUDP()
+	mapping["tfo"] = p.SupportTFO()
 	return json.Marshal(mapping)
 }
 
diff --git a/adapter/outbound/base.go b/adapter/outbound/base.go
index 145a3f97..a7e068dd 100644
--- a/adapter/outbound/base.go
+++ b/adapter/outbound/base.go
@@ -18,6 +18,7 @@ type Base struct {
 	iface  string
 	tp     C.AdapterType
 	udp    bool
+	tfo    bool
 	rmark  int
 	id     string
 	prefer C.DNSPrefer
@@ -76,6 +77,11 @@ func (b *Base) SupportUDP() bool {
 	return b.udp
 }
 
+// SupportTFO implements C.ProxyAdapter
+func (b *Base) SupportTFO() bool {
+	return b.tfo
+}
+
 // MarshalJSON implements C.ProxyAdapter
 func (b *Base) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]string{
@@ -130,6 +136,7 @@ type BaseOption struct {
 	Addr        string
 	Type        C.AdapterType
 	UDP         bool
+	TFO         bool
 	Interface   string
 	RoutingMark int
 	Prefer      C.DNSPrefer
@@ -141,6 +148,7 @@ func NewBase(opt BaseOption) *Base {
 		addr:   opt.Addr,
 		tp:     opt.Type,
 		udp:    opt.UDP,
+		tfo:    opt.TFO,
 		iface:  opt.Interface,
 		rmark:  opt.RoutingMark,
 		prefer: opt.Prefer,
diff --git a/adapter/outbound/hysteria.go b/adapter/outbound/hysteria.go
index 932e8feb..56462399 100644
--- a/adapter/outbound/hysteria.go
+++ b/adapter/outbound/hysteria.go
@@ -30,12 +30,10 @@ import (
 )
 
 const (
-	mbpsToBps   = 125000
-	minSpeedBPS = 16384
+	mbpsToBps = 125000
 
 	DefaultStreamReceiveWindow     = 15728640 // 15 MB/s
 	DefaultConnectionReceiveWindow = 67108864 // 64 MB/s
-	DefaultMaxIncomingStreams      = 1024
 
 	DefaultALPN        = "hysteria"
 	DefaultProtocol    = "udp"
@@ -258,6 +256,7 @@ func NewHysteria(option HysteriaOption) (*Hysteria, error) {
 			addr:   addr,
 			tp:     C.Hysteria,
 			udp:    true,
+			tfo:    option.FastOpen,
 			iface:  option.Interface,
 			rmark:  option.RoutingMark,
 			prefer: C.NewDNSPrefer(option.IPVersion),
diff --git a/adapter/outbound/tuic.go b/adapter/outbound/tuic.go
index 264c991b..38c220de 100644
--- a/adapter/outbound/tuic.go
+++ b/adapter/outbound/tuic.go
@@ -193,6 +193,7 @@ func NewTuic(option TuicOption) (*Tuic, error) {
 			addr:   addr,
 			tp:     C.Tuic,
 			udp:    true,
+			tfo:    option.FastOpen,
 			iface:  option.Interface,
 			prefer: C.NewDNSPrefer(option.IPVersion),
 		},
diff --git a/constant/adapters.go b/constant/adapters.go
index 53d03fb0..d25023e2 100644
--- a/constant/adapters.go
+++ b/constant/adapters.go
@@ -86,6 +86,7 @@ type ProxyAdapter interface {
 	Type() AdapterType
 	Addr() string
 	SupportUDP() bool
+	SupportTFO() bool
 	MarshalJSON() ([]byte, error)
 
 	// StreamConn wraps a protocol around net.Conn with Metadata.