diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/V2rayConfig.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/V2rayConfig.kt
index 5d05a1782..cc58436d8 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/V2rayConfig.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/dto/V2rayConfig.kt
@@ -192,10 +192,10 @@ data class V2rayConfig(
             }
 
             data class GrpcSettingsBean(var serviceName: String = "",
-                                        val multiMode: Boolean? = null)
+                                        var multiMode: Boolean? = null)
 
             fun populateTransportSettings(transport: String, headerType: String?, host: String?, path: String?, seed: String?,
-                                          quicSecurity: String?, key: String?): String {
+                                          quicSecurity: String?, key: String?, mode: String?, serviceName: String?): String {
                 var sni = ""
                 network = transport
                 when (network) {
@@ -250,7 +250,8 @@ data class V2rayConfig(
                     }
                     "grpc" -> {
                         val grpcSetting = GrpcSettingsBean()
-                        grpcSetting.serviceName = path ?: ""
+                        grpcSetting.multiMode = mode == "multi"
+                        grpcSetting.serviceName = serviceName ?: ""
                         sni = host ?: ""
                         grpcSettings = grpcSetting
                     }
@@ -357,7 +358,7 @@ data class V2rayConfig(
                     }
                     "grpc" -> {
                         val grpcSetting = streamSettings?.grpcSettings ?: return null
-                        listOf("",
+                        listOf(if (grpcSetting.multiMode == true) "multi" else "gun",
                                 "",
                                 grpcSetting.serviceName)
                     }
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ServerActivity.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ServerActivity.kt
index e237ec8e0..7a068474a 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ServerActivity.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/ServerActivity.kt
@@ -5,6 +5,9 @@ import android.support.v7.app.AlertDialog
 import android.text.TextUtils
 import android.view.Menu
 import android.view.MenuItem
+import android.view.View
+import android.widget.AdapterView
+import android.widget.ArrayAdapter
 import com.tencent.mmkv.MMKV
 import com.v2ray.ang.R
 import com.v2ray.ang.dto.EConfigType
@@ -28,6 +31,7 @@ import kotlinx.android.synthetic.main.activity_server_vmess.et_remarks
 import kotlinx.android.synthetic.main.activity_server_vmess.et_request_host
 import kotlinx.android.synthetic.main.activity_server_vmess.sp_allow_insecure
 import kotlinx.android.synthetic.main.activity_server_vmess.sp_header_type
+import kotlinx.android.synthetic.main.activity_server_vmess.sp_header_type_title
 import kotlinx.android.synthetic.main.activity_server_vmess.sp_network
 import kotlinx.android.synthetic.main.activity_server_vmess.sp_stream_security
 
@@ -56,8 +60,14 @@ class ServerActivity : BaseActivity() {
     private val networks: Array<out String> by lazy {
         resources.getStringArray(R.array.networks)
     }
-    private val headertypes: Array<out String> by lazy {
-        resources.getStringArray(R.array.headertypes)
+    private val tcpTypes: Array<out String> by lazy {
+        resources.getStringArray(R.array.header_type_tcp)
+    }
+    private val kcpAndQuicTypes: Array<out String> by lazy {
+        resources.getStringArray(R.array.header_type_kcp_and_quic)
+    }
+    private val grpcModes: Array<out String> by lazy {
+        resources.getStringArray(R.array.mode_type_grpc)
     }
     private val streamSecuritys: Array<out String> by lazy {
         resources.getStringArray(R.array.streamsecurityxs)
@@ -79,6 +89,26 @@ class ServerActivity : BaseActivity() {
 //            EConfigType.VLESS -> setContentView(R.layout.activity_server_vless)
 //            EConfigType.TROJAN -> setContentView(R.layout.activity_server_trojan)
         }
+        sp_network?.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
+            override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
+                val types = transportTypes(networks[position])
+                sp_header_type?.isEnabled = types.size > 1
+                val adapter = ArrayAdapter(this@ServerActivity, android.R.layout.simple_spinner_item, types)
+                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
+                sp_header_type?.adapter = adapter
+                sp_header_type_title?.text = if (networks[position] == "grpc")
+                    getString(R.string.server_lab_mode_type) else
+                    getString(R.string.server_lab_head_type)
+                config?.getProxyOutbound()?.getTransportSettingDetails()?.let { transportDetails ->
+                    sp_header_type.setSelection(Utils.arrayFind(types, transportDetails[0]))
+                    et_request_host.text = Utils.getEditable(transportDetails[1])
+                    et_path.text = Utils.getEditable(transportDetails[2])
+                }
+            }
+            override fun onNothingSelected(parent: AdapterView<*>?) {
+                // do nothing
+            }
+        }
         if (config != null) {
             bindingServer(config)
         } else {
@@ -129,11 +159,6 @@ class ServerActivity : BaseActivity() {
         if (network >= 0) {
             sp_network?.setSelection(network)
         }
-        outbound.getTransportSettingDetails()?.let { transportDetails ->
-            sp_header_type.setSelection(Utils.arrayFind(headertypes, transportDetails[0]))
-            et_request_host.text = Utils.getEditable(transportDetails[1])
-            et_path.text = Utils.getEditable(transportDetails[2])
-        }
         return true
     }
 
@@ -246,16 +271,20 @@ class ServerActivity : BaseActivity() {
     }
 
     private fun saveStreamSettings(streamSetting: V2rayConfig.OutboundBean.StreamSettingsBean, config: ServerConfig) {
+        val network = if (sp_network != null) networks[sp_network.selectedItemPosition] else DEFAULT_NETWORK
+        val type = if (sp_header_type != null) transportTypes(network)[sp_header_type.selectedItemPosition] else "";
         val requestHost = if (et_request_host != null) et_request_host.text.toString().trim() else ""
         val path = if (et_path != null) et_path.text.toString().trim() else ""
         var sni = streamSetting.populateTransportSettings(
-                if (sp_network != null) networks[sp_network.selectedItemPosition] else DEFAULT_NETWORK,
-                if (sp_header_type != null) headertypes[sp_header_type.selectedItemPosition] else "",
-                requestHost,
-                path,
-                path,
-                requestHost,
-                path
+                transport = network,
+                headerType = type,
+                host = requestHost,
+                path = path,
+                seed = path,
+                quicSecurity = requestHost,
+                key = path,
+                mode = type,
+                serviceName = path
         )
         val allowInsecure = if (sp_allow_insecure == null || allowinsecures[sp_allow_insecure.selectedItemPosition].isBlank()) {
             false//settingsStorage?.decodeBool(PREF_ALLOW_INSECURE) ?: false
@@ -270,6 +299,18 @@ class ServerActivity : BaseActivity() {
         )
     }
 
+    private fun transportTypes(network: String?): Array<out String> {
+        return if (network == "tcp") {
+            tcpTypes
+        } else if (network == "kcp" || network == "quic") {
+            kcpAndQuicTypes
+        } else if (network == "grpc") {
+            grpcModes
+        } else {
+            arrayOf("---")
+        }
+    }
+
     /**
      * save server config
      */
diff --git a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/AngConfigManager.kt b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/AngConfigManager.kt
index d03686b4c..f5279f44e 100644
--- a/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/AngConfigManager.kt
+++ b/V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/AngConfigManager.kt
@@ -131,7 +131,8 @@ object AngConfigManager {
                 }
                 config.outboundBean?.streamSettings?.let { streamSetting ->
                     val sni = streamSetting.populateTransportSettings(vmessBean.network, vmessBean.headerType,
-                            vmessBean.requestHost, vmessBean.path, vmessBean.path, vmessBean.requestHost, vmessBean.path)
+                            vmessBean.requestHost, vmessBean.path, vmessBean.path, vmessBean.requestHost, vmessBean.path,
+                            vmessBean.headerType, vmessBean.path)
 //                    val allowInsecure = if (vmessBean.allowInsecure.isBlank()) {
 //                        settingsStorage?.decodeBool(AppConfig.PREF_ALLOW_INSECURE) ?: false
 //                    } else {
@@ -209,7 +210,7 @@ object AngConfigManager {
                             vnext.users[0].alterId = Utils.parseInt(vmessQRCode.aid)
                         }
                         val sni = streamSetting.populateTransportSettings(vmessQRCode.net, vmessQRCode.type, vmessQRCode.host,
-                                vmessQRCode.path, vmessQRCode.path, vmessQRCode.host, vmessQRCode.path)
+                                vmessQRCode.path, vmessQRCode.path, vmessQRCode.host, vmessQRCode.path, vmessQRCode.type, vmessQRCode.path)
                         streamSetting.populateTlsSettings(vmessQRCode.tls, allowInsecure,
                                 if (vmessQRCode.sni.isNotBlank()) vmessQRCode.sni else sni)
                     }
@@ -312,7 +313,8 @@ object AngConfigManager {
                 }
 
                 val sni = streamSetting.populateTransportSettings(queryParam["type"] ?: "tcp", queryParam["headerType"],
-                        queryParam["host"], queryParam["path"], queryParam["seed"], queryParam["quicSecurity"], queryParam["key"])
+                        queryParam["host"], queryParam["path"], queryParam["seed"], queryParam["quicSecurity"], queryParam["key"],
+                        queryParam["mode"], queryParam["serviceName"])
                 streamSetting.populateTlsSettings(queryParam["security"] ?: "", allowInsecure, queryParam["sni"] ?: sni)
             }
             if (config == null){
@@ -337,7 +339,7 @@ object AngConfigManager {
             val uri = URI(uriString)
             check(uri.scheme == "vmess")
             val (_, protocol, tlsStr, uuid, alterId) =
-                    Regex("(tcp|http|ws|kcp|quic)(\\+tls)?:([0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12})-([0-9]+)")
+                    Regex("(tcp|http|ws|kcp|quic|grpc)(\\+tls)?:([0-9a-z]{8}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{4}-[0-9a-z]{12})-([0-9]+)")
                             .matchEntire(uri.userInfo)?.groupValues
                             ?: error("parse user info fail.")
             val tls = tlsStr.isNotBlank()
@@ -357,8 +359,8 @@ object AngConfigManager {
 
             val sni = streamSetting.populateTransportSettings(protocol, queryParam["type"],
                     queryParam["host"]?.split("|")?.get(0) ?: "",
-                    queryParam["path"]?.takeIf { it.trim() != "/" } ?: "",
-                    queryParam["seed"], queryParam["security"], queryParam["key"])
+                    queryParam["path"]?.takeIf { it.trim() != "/" } ?: "", queryParam["seed"], queryParam["security"],
+                    queryParam["key"], queryParam["mode"], queryParam["serviceName"])
             streamSetting.populateTlsSettings(if (tls) TLS else "", allowInsecure, sni)
             true
         }.getOrElse { false }
@@ -501,6 +503,10 @@ object AngConfigManager {
                                 dicQuery["quicSecurity"] = Utils.urlEncode(transportDetails[1])
                                 dicQuery["key"] = Utils.urlEncode(transportDetails[2])
                             }
+                            "grpc" -> {
+                                dicQuery["mode"] = transportDetails[0]
+                                dicQuery["serviceName"] = transportDetails[2]
+                            }
                         }
                     }
                     val query = "?" + dicQuery.toList().joinToString(
diff --git a/V2rayNG/app/src/main/res/layout/activity_server_vmess.xml b/V2rayNG/app/src/main/res/layout/activity_server_vmess.xml
index 593cf3348..69fb9b586 100644
--- a/V2rayNG/app/src/main/res/layout/activity_server_vmess.xml
+++ b/V2rayNG/app/src/main/res/layout/activity_server_vmess.xml
@@ -174,6 +174,7 @@
             android:orientation="vertical">
 
             <TextView
+                android:id="@+id/sp_header_type_title"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="@string/server_lab_head_type" />
@@ -181,8 +182,7 @@
             <Spinner
                 android:id="@+id/sp_header_type"
                 android:layout_width="match_parent"
-                android:layout_height="@dimen/edit_height"
-                android:entries="@array/headertypes" />
+                android:layout_height="@dimen/edit_height" />
         </LinearLayout>
 
         <LinearLayout
diff --git a/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml b/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml
index bfa8a8d73..2acf62475 100644
--- a/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml
+++ b/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml
@@ -43,8 +43,9 @@
     <string name="server_lab_network">传输协议(network)</string>
     <string name="server_lab_more_function">功能设置（不清楚则保持默认值）</string>
     <string name="server_lab_head_type">伪装类型(type)</string>
+    <string name="server_lab_mode_type">gRPC 传输模式 (mode)</string>
     <string name="server_lab_request_host">伪装域名(host)(host/ws host/h2 host)/QUIC 加密方式</string>
-    <string name="server_lab_path">path(ws path/h2 path)/QUIC 加密密钥/kcp seed/grpc serviceName</string>
+    <string name="server_lab_path">path(ws path/h2 path)/QUIC 加密密钥/kcp seed/gRPC serviceName</string>
     <string name="server_lab_stream_security">底层传输安全(tls)</string>
     <string name="server_lab_allow_insecure">跳过证书验证(allowInsecure)</string>
     <string name="server_lab_address3">服务器地址</string>
diff --git a/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml b/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml
index 416dbf7f6..dd6ac7117 100644
--- a/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml
+++ b/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml
@@ -43,8 +43,9 @@
     <string name="server_lab_network">網路</string>
     <string name="server_lab_more_function">更多功能</string>
     <string name="server_lab_head_type">標頭類型</string>
+    <string name="server_lab_mode_type">gRPC 傳輸模式 (mode)</string>
     <string name="server_lab_request_host">要求主機(host)(host/ws host/h2 host)/QUIC加密方式</string>
-    <string name="server_lab_path">path(ws path/h2 path)/QUIC加密密鑰/kcp seed/grpc serviceName</string>
+    <string name="server_lab_path">path(ws path/h2 path)/QUIC加密密鑰/kcp seed/gRPC serviceName</string>
     <string name="server_lab_stream_security">傳輸層安全性(tls)</string>
     <string name="server_lab_allow_insecure">跳過證書驗證(allowInsecure)</string>
     <string name="server_lab_address3">伺服器位址</string>
diff --git a/V2rayNG/app/src/main/res/values/arrays.xml b/V2rayNG/app/src/main/res/values/arrays.xml
index 3a690f7be..98f2f609c 100644
--- a/V2rayNG/app/src/main/res/values/arrays.xml
+++ b/V2rayNG/app/src/main/res/values/arrays.xml
@@ -27,9 +27,13 @@
         <item>grpc</item>
     </string-array>
 
-    <string-array name="headertypes" translatable="false">
+    <string-array name="header_type_tcp" translatable="false">
         <item>none</item>
         <item>http</item>
+    </string-array>
+
+    <string-array name="header_type_kcp_and_quic" translatable="false">
+        <item>none</item>
         <item>srtp</item>
         <item>utp</item>
         <item>wechat-video</item>
@@ -37,18 +41,10 @@
         <item>wireguard</item>
     </string-array>
 
-    <string-array name="headertypetcps" translatable="false">
-        <item>none</item>
-        <item>http</item>
-    </string-array>
-
-    <string-array name="headertypekcps" translatable="false">
-        <item>none</item>
-        <item>srtp</item>
-        <item>utp</item>
-        <item>wechat-video</item>
-        <item>dtls</item>
-        <item>wireguard</item>
+    <string-array name="mode_type_grpc" translatable="false">
+        <item>gun</item>
+        <item>multi</item>
+ <!--Hide this option until core support it       <item>guna</item>-->
     </string-array>
 
     <string-array name="streamsecuritys" translatable="false">
diff --git a/V2rayNG/app/src/main/res/values/strings.xml b/V2rayNG/app/src/main/res/values/strings.xml
index 06782022b..334aecae9 100644
--- a/V2rayNG/app/src/main/res/values/strings.xml
+++ b/V2rayNG/app/src/main/res/values/strings.xml
@@ -40,11 +40,12 @@
     <string name="server_lab_id">id</string>
     <string name="server_lab_alterid">alterId</string>
     <string name="server_lab_security">security</string>
-    <string name="server_lab_network">network</string>
+    <string name="server_lab_network">Network</string>
     <string name="server_lab_more_function">more function</string>
     <string name="server_lab_head_type">head type</string>
+    <string name="server_lab_mode_type">gRPC mode</string>
     <string name="server_lab_request_host">request host(host/ws host/h2 host)/QUIC security</string>
-    <string name="server_lab_path">path(ws path/h2 path)/QUIC key/kcp seed/grpc serviceName</string>
+    <string name="server_lab_path">path(ws path/h2 path)/QUIC key/kcp seed/gRPC serviceName</string>
     <string name="server_lab_stream_security">tls</string>
     <string name="server_lab_allow_insecure">allowInsecure</string>
     <string name="server_lab_address3">address</string>