diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/ProfileItem.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/ProfileItem.kt
index d2737866..9d4b1c40 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/dto/ProfileItem.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/dto/ProfileItem.kt
@@ -29,6 +29,9 @@ data class ProfileItem(
     var host: String? = null,
     var path: String? = null,
     var seed: String? = null,
+    var kcpMtu: Int? = null,
+    var kcpTti: Int? = null,
+
     var quicSecurity: String? = null,
     var quicKey: String? = null,
     var mode: String? = null,
@@ -102,6 +105,8 @@ data class ProfileItem(
                 && this.host == obj.host
                 && this.path == obj.path
                 && this.seed == obj.seed
+                && this.kcpMtu == obj.kcpMtu
+                && this.kcpTti == obj.kcpTti
                 && this.quicSecurity == obj.quicSecurity
                 && this.quicKey == obj.quicKey
                 && this.mode == obj.mode
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/fmt/FmtBase.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/fmt/FmtBase.kt
index d3fd4772..ac636289 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/fmt/FmtBase.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/fmt/FmtBase.kt
@@ -60,6 +60,8 @@ open class FmtBase {
         config.path = queryParam["path"]
 
         config.seed = queryParam["seed"]
+        config.kcpMtu = queryParam["mtu"]?.toIntOrNull()
+        config.kcpTti = queryParam["tti"]?.toIntOrNull()
         config.quicSecurity = queryParam["quicSecurity"]
         config.quicKey = queryParam["key"]
         config.mode = queryParam["mode"]
@@ -112,6 +114,8 @@ open class FmtBase {
         config.mldsa65Verify?.nullIfBlank()?.let { dicQuery["pqv"] = it }
         config.flow?.nullIfBlank()?.let { dicQuery["flow"] = it }
         config.finalMask?.nullIfBlank()?.let { dicQuery["fm"] = it }
+        config.kcpMtu?.let { dicQuery["mtu"] = it.toString() }
+        config.kcpTti?.let { dicQuery["tti"] = it.toString() }
         // Add two keys for compatibility: "insecure" and "allowInsecure"
         if (config.security == AppConfig.TLS) {
             val insecureFlag = if (config.insecure == true) "1" else "0"
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
index 1db60022..a2db386f 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt
@@ -1305,7 +1305,10 @@ object V2rayConfigManager {
             }
 
             NetworkType.KCP.type -> {
-                streamSettings.kcpSettings = StreamSettingsBean.KcpSettingsBean()
+                val kcpSetting = StreamSettingsBean.KcpSettingsBean()
+                profileItem.kcpMtu?.let { kcpSetting.mtu = it }
+                profileItem.kcpTti?.let { kcpSetting.tti = it }
+                streamSettings.kcpSettings = kcpSetting
                 val udpMaskList = mutableListOf<StreamSettingsBean.FinalMaskBean.MaskBean>()
                 if (!headerType.isNullOrEmpty() && headerType != "none") {
                     val kcpHeaderType = when {
diff --git a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/ServerActivity.kt b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/ServerActivity.kt
index 345d29b5..b792d5ba 100644
--- a/V2rayNG/app/src/main/java/com/v2ray/ang/ui/ServerActivity.kt
+++ b/V2rayNG/app/src/main/java/com/v2ray/ang/ui/ServerActivity.kt
@@ -132,6 +132,9 @@ class ServerActivity : BaseActivity() {
     private val et_port_hop_interval: EditText? by lazy { findViewById(R.id.et_port_hop_interval) }
     private val et_bandwidth_down: EditText? by lazy { findViewById(R.id.et_bandwidth_down) }
     private val et_bandwidth_up: EditText? by lazy { findViewById(R.id.et_bandwidth_up) }
+    private val et_kcp_mtu: EditText? by lazy { findViewById(R.id.et_kcp_mtu) }
+    private val et_kcp_tti: EditText? by lazy { findViewById(R.id.et_kcp_tti) }
+    private val layout_kcp: LinearLayout? by lazy { findViewById(R.id.layout_kcp) }
     private val et_extra: EditText? by lazy { findViewById(R.id.et_extra) }
     private val et_fm: EditText? by lazy { findViewById(R.id.et_fm) }
     private val layout_extra: LinearLayout? by lazy { findViewById(R.id.layout_extra) }
@@ -245,6 +248,14 @@ class ServerActivity : BaseActivity() {
                 )
                 et_fm?.text = Utils.getEditable(config?.finalMask)
 
+                layout_kcp?.visibility =
+                    when (networks[position]) {
+                        NetworkType.KCP.type -> View.VISIBLE
+                        else -> View.GONE
+                    }
+                et_kcp_mtu?.text = Utils.getEditable(config?.kcpMtu?.toString().orEmpty())
+                et_kcp_tti?.text = Utils.getEditable(config?.kcpTti?.toString().orEmpty())
+
                 layout_extra?.visibility =
                     when (networks[position]) {
                         NetworkType.XHTTP.type -> View.VISIBLE
@@ -569,6 +580,8 @@ class ServerActivity : BaseActivity() {
         profileItem.xhttpMode = transportTypes(networks[network])[type]
         profileItem.xhttpExtra = et_extra?.text?.toString()?.trim().nullIfBlank()
         profileItem.finalMask = et_fm?.text?.toString()?.trim()?.nullIfBlank()
+        profileItem.kcpMtu = et_kcp_mtu?.text?.toString()?.toIntOrNull()
+        profileItem.kcpTti = et_kcp_tti?.text?.toString()?.toIntOrNull()
     }
 
     private fun saveTls(config: ProfileItem) {
diff --git a/V2rayNG/app/src/main/res/layout/layout_transport.xml b/V2rayNG/app/src/main/res/layout/layout_transport.xml
index 07e59251..9e319053 100644
--- a/V2rayNG/app/src/main/res/layout/layout_transport.xml
+++ b/V2rayNG/app/src/main/res/layout/layout_transport.xml
@@ -96,6 +96,49 @@
             android:inputType="text" />
     </LinearLayout>
 
+    <LinearLayout
+        android:id="@+id/layout_kcp"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/padding_spacing_dp16"
+            android:orientation="vertical">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/server_lab_kcp_mtu" />
+
+            <EditText
+                android:id="@+id/et_kcp_mtu"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="number" />
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="@dimen/padding_spacing_dp16"
+            android:orientation="vertical">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/server_lab_kcp_tti" />
+
+            <EditText
+                android:id="@+id/et_kcp_tti"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:inputType="number" />
+        </LinearLayout>
+    </LinearLayout>
+
     <LinearLayout
         android:id="@+id/layout_extra"
         android:layout_width="match_parent"
diff --git a/V2rayNG/app/src/main/res/values-ar/strings.xml b/V2rayNG/app/src/main/res/values-ar/strings.xml
index f76db279..989243f0 100644
--- a/V2rayNG/app/src/main/res/values-ar/strings.xml
+++ b/V2rayNG/app/src/main/res/values-ar/strings.xml
@@ -89,6 +89,8 @@
     <string name="server_lab_reserved">محجوز (اختياري)</string>
     <string name="server_lab_local_address">العنوان المحلي (اختياري IPv4/IPv6، مفصولة بفواصل)</string>
     <string name="server_lab_local_mtu">Mtu (اختياري، الافتراضي 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (اختياري، الافتراضي في النواة 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (اختياري، الافتراضي في النواة 50)</string>
     <string name="toast_success">نجاح</string>
     <string name="toast_failure">فشل</string>
     <string name="toast_none_data">لا يوجد شيء</string>
diff --git a/V2rayNG/app/src/main/res/values-bn/strings.xml b/V2rayNG/app/src/main/res/values-bn/strings.xml
index 51a3c747..6efc80f9 100644
--- a/V2rayNG/app/src/main/res/values-bn/strings.xml
+++ b/V2rayNG/app/src/main/res/values-bn/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">সংরক্ষিত (ঐচ্ছিক)</string>
     <string name="server_lab_local_address">স্থানীয় ঠিকানা (ঐচ্ছিক IPv4/IPv6, কমা দ্বারা পৃথক করা)</string>
     <string name="server_lab_local_mtu">MTU (ঐচ্ছিক, ডিফল্ট 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (ঐচ্ছিক, কোর ডিফল্ট 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (ঐচ্ছিক, কোর ডিফল্ট 50)</string>
     <string name="toast_success">সফল</string>
     <string name="toast_failure">ব্যর্থ</string>
     <string name="toast_none_data">কোনও তথ্য নেই</string>
diff --git a/V2rayNG/app/src/main/res/values-bqi-rIR/strings.xml b/V2rayNG/app/src/main/res/values-bqi-rIR/strings.xml
index 3b173e43..a92f7709 100644
--- a/V2rayNG/app/src/main/res/values-bqi-rIR/strings.xml
+++ b/V2rayNG/app/src/main/res/values-bqi-rIR/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved(اختیاری، وا کاما ز یک جوڌا ابۊن)</string>
     <string name="server_lab_local_address">نشۊوی مهلی (اختیاری IPv4/IPv6، وا کاما ز یک جوڌا ابۊن)</string>
     <string name="server_lab_local_mtu">Mtu(اختیاری، پؽش فرز 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (اختیاری، پؽش فرز هسته 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (اختیاری، پؽش فرز هسته 50)</string>
     <string name="toast_success">وا مووفقیت ٱنجوم وابی</string>
     <string name="toast_failure">شکست خرد</string>
     <string name="toast_none_data">هیچ داده ای وۊجۊڌ نڌاره</string>
diff --git a/V2rayNG/app/src/main/res/values-fa/strings.xml b/V2rayNG/app/src/main/res/values-fa/strings.xml
index 4a8dedff..d7f2d009 100644
--- a/V2rayNG/app/src/main/res/values-fa/strings.xml
+++ b/V2rayNG/app/src/main/res/values-fa/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved (اختیاری، جدا شده با کاما)</string>
     <string name="server_lab_local_address">آدرس محلی (IPv4/IPv6 اختیاری، جدا شده با کاما)</string>
     <string name="server_lab_local_mtu">MTU (اختیاری، پیش‌فرض 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (اختیاری، پیش‌فرض هسته 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (اختیاری، پیش‌فرض هسته 50)</string>
     <string name="toast_success">با موفقیت انجام شد</string>
     <string name="toast_failure">شکست</string>
     <string name="toast_none_data">هیچ داده ای وجود ندارد</string>
diff --git a/V2rayNG/app/src/main/res/values-ru/strings.xml b/V2rayNG/app/src/main/res/values-ru/strings.xml
index 55cba3df..474edfae 100644
--- a/V2rayNG/app/src/main/res/values-ru/strings.xml
+++ b/V2rayNG/app/src/main/res/values-ru/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved (необязательно, через запятую)</string>
     <string name="server_lab_local_address">Локальный адрес (необязательно, IPv4/IPv6 через запятую)</string>
     <string name="server_lab_local_mtu">MTU (необязательно, по умолчанию 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (необязательно, по умолчанию 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (необязательно, по умолчанию 50)</string>
     <string name="toast_success">Успешно</string>
     <string name="toast_failure">Ошибка</string>
     <string name="toast_none_data">Ничего нет</string>
diff --git a/V2rayNG/app/src/main/res/values-vi/strings.xml b/V2rayNG/app/src/main/res/values-vi/strings.xml
index 86701ce3..b2da9945 100644
--- a/V2rayNG/app/src/main/res/values-vi/strings.xml
+++ b/V2rayNG/app/src/main/res/values-vi/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved (Không bắt buộc)</string>
     <string name="server_lab_local_address">Địa chỉ cục bộ (IPv4 / IPv6, phân cách bằng dấu phẩy)</string>
     <string name="server_lab_local_mtu">MTU (Không bắt buộc, mặc định là 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (Không bắt buộc, mặc định core là 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (Không bắt buộc, mặc định core là 50)</string>
     <string name="toast_success">Thành công!</string>
     <string name="toast_failure">Đã xảy ra lỗi, vui lòng thử lại!</string>
     <string name="toast_none_data">Không có gì ở đây!</string>
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 bc062b87..b4d03189 100644
--- a/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml
+++ b/V2rayNG/app/src/main/res/values-zh-rCN/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved (可选，逗号隔开)</string>
     <string name="server_lab_local_address">本地地址 (可选 IPv4/IPv6，逗号隔开)</string>
     <string name="server_lab_local_mtu">Mtu (可选, 默认 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (可选, 默认 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (可选, 默认 50)</string>
     <string name="toast_success">成功</string>
     <string name="toast_failure">失败</string>
     <string name="toast_none_data">没有数据</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 0d86c26c..b990e1ad 100644
--- a/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml
+++ b/V2rayNG/app/src/main/res/values-zh-rTW/strings.xml
@@ -88,6 +88,8 @@
     <string name="server_lab_reserved">Reserved (可選，逗號隔開)</string>
     <string name="server_lab_local_address">本機位址 (可選 IPv4/IPv6，逗號隔開)</string>
     <string name="server_lab_local_mtu">MTU (可選, 預設 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (可選, 預設 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (可選, 預設 50)</string>
     <string name="toast_success">成功</string>
     <string name="toast_failure">失敗</string>
     <string name="toast_none_data">無資料</string>
diff --git a/V2rayNG/app/src/main/res/values/strings.xml b/V2rayNG/app/src/main/res/values/strings.xml
index 88a1a3c1..635ff0e2 100644
--- a/V2rayNG/app/src/main/res/values/strings.xml
+++ b/V2rayNG/app/src/main/res/values/strings.xml
@@ -89,6 +89,8 @@
     <string name="server_lab_reserved">Reserved(Optional, separated by commas)</string>
     <string name="server_lab_local_address">Local address (optional IPv4/IPv6, separated by commas)</string>
     <string name="server_lab_local_mtu">Mtu(optional, default 1420)</string>
+    <string name="server_lab_kcp_mtu">mKCP MTU (Optional, core default 1350)</string>
+    <string name="server_lab_kcp_tti">mKCP TTI (Optional, core default 50)</string>
     <string name="toast_success">Success</string>
     <string name="toast_failure">Failure</string>
     <string name="toast_none_data">There is nothing</string>