diff --git a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/SettingPlayerActivity.java b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/SettingPlayerActivity.java
index 30961ad8c..d9461e70e 100644
--- a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/SettingPlayerActivity.java
+++ b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/SettingPlayerActivity.java
@@ -11,6 +11,7 @@ import com.fongmi.android.tv.R;
 import com.fongmi.android.tv.Setting;
 import com.fongmi.android.tv.databinding.ActivitySettingPlayerBinding;
 import com.fongmi.android.tv.impl.BufferCallback;
+import com.fongmi.android.tv.impl.DanmuAlphaCallback;
 import com.fongmi.android.tv.impl.DanmuLineCallback;
 import com.fongmi.android.tv.impl.DanmuSizeCallback;
 import com.fongmi.android.tv.impl.SubtitleCallback;
@@ -19,13 +20,14 @@ import com.fongmi.android.tv.player.ExoUtil;
 import com.fongmi.android.tv.player.Players;
 import com.fongmi.android.tv.ui.base.BaseActivity;
 import com.fongmi.android.tv.ui.dialog.BufferDialog;
+import com.fongmi.android.tv.ui.dialog.DanmuAlphaDialog;
 import com.fongmi.android.tv.ui.dialog.DanmuLineDialog;
 import com.fongmi.android.tv.ui.dialog.DanmuSizeDialog;
 import com.fongmi.android.tv.ui.dialog.SubtitleDialog;
 import com.fongmi.android.tv.ui.dialog.UaDialog;
 import com.fongmi.android.tv.utils.ResUtil;
 
-public class SettingPlayerActivity extends BaseActivity implements UaCallback, BufferCallback, SubtitleCallback, DanmuLineCallback, DanmuSizeCallback {
+public class SettingPlayerActivity extends BaseActivity implements UaCallback, BufferCallback, SubtitleCallback, DanmuLineCallback, DanmuSizeCallback, DanmuAlphaCallback {
 
     private ActivitySettingPlayerBinding mBinding;
     private String[] danmuSpeed;
@@ -60,6 +62,7 @@ public class SettingPlayerActivity extends BaseActivity implements UaCallback, B
         mBinding.subtitleText.setText(String.valueOf(Setting.getSubtitle()));
         mBinding.danmuSizeText.setText(String.valueOf(Setting.getDanmuSize()));
         mBinding.danmuLineText.setText(String.valueOf(Setting.getDanmuLine(3)));
+        mBinding.danmuAlphaText.setText(String.valueOf(Setting.getDanmuAlpha()));
         mBinding.flagText.setText((flag = ResUtil.getStringArray(R.array.select_flag))[Setting.getFlag()]);
         mBinding.httpText.setText((http = ResUtil.getStringArray(R.array.select_exo_http))[Setting.getHttp()]);
         mBinding.scaleText.setText((scale = ResUtil.getStringArray(R.array.select_scale))[Setting.getScale()]);
@@ -86,6 +89,7 @@ public class SettingPlayerActivity extends BaseActivity implements UaCallback, B
         mBinding.caption.setOnLongClickListener(this::onCaption);
         mBinding.danmuSize.setOnClickListener(this::onDanmuSize);
         mBinding.danmuLine.setOnClickListener(this::onDanmuLine);
+        mBinding.danmuAlpha.setOnClickListener(this::onDanmuAlpha);
         mBinding.danmuSpeed.setOnClickListener(this::setDanmuSpeed);
     }
 
@@ -203,4 +207,15 @@ public class SettingPlayerActivity extends BaseActivity implements UaCallback, B
         Setting.putDanmuSpeed(index = index == danmuSpeed.length - 1 ? 0 : ++index);
         mBinding.danmuSpeedText.setText(danmuSpeed[index]);
     }
+
+    public void onDanmuAlpha(View view) {
+        DanmuAlphaDialog.create(this).show();
+    }
+
+    @Override
+    public void setDanmuAlpha(int alpha) {
+        mBinding.danmuAlphaText.setText(String.valueOf(alpha));
+        Setting.putDanmuAlpha(alpha);
+    }
+
 }
diff --git a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VideoActivity.java b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
index 8eb745fdf..5d07a3fb7 100644
--- a/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
+++ b/app/src/leanback/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
@@ -415,6 +415,7 @@ public class VideoActivity extends BaseActivity implements CustomKeyDownVod.List
 
     private void setDanmuView() {
         int maxLine = Setting.getDanmuLine(3);
+        float alpha = ((float) Setting.getDanmuAlpha()) / 100.0f;
         mPlayers.setDanmuView(mBinding.danmaku);
         HashMap<Integer, Integer> maxLines = new HashMap<>();
         float scrollSpeedFactor = 1.6f - (Setting.getDanmuSpeed() * 0.2f);
@@ -423,7 +424,7 @@ public class VideoActivity extends BaseActivity implements CustomKeyDownVod.List
         maxLines.put(BaseDanmaku.TYPE_SCROLL_RL, maxLine);
         maxLines.put(BaseDanmaku.TYPE_SCROLL_LR, maxLine);
         maxLines.put(BaseDanmaku.TYPE_FIX_BOTTOM, maxLine);
-        mDanmakuContext.setDanmakuStyle(IDisplayer.DANMAKU_STYLE_STROKEN, 3).setMaximumLines(maxLines).setScrollSpeedFactor(scrollSpeedFactor).setDanmakuMargin(12).setScaleTextSize(0.8f);
+        mDanmakuContext.setDanmakuStyle(IDisplayer.DANMAKU_STYLE_STROKEN, 3).setMaximumLines(maxLines).setScrollSpeedFactor(scrollSpeedFactor).setDanmakuTransparency(alpha).setDanmakuMargin(12).setScaleTextSize(0.8f);
         mBinding.control.danmu.setActivated(Setting.isDanmu());
     }
 
diff --git a/app/src/leanback/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java b/app/src/leanback/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java
new file mode 100644
index 000000000..3441f14ee
--- /dev/null
+++ b/app/src/leanback/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java
@@ -0,0 +1,53 @@
+package com.fongmi.android.tv.ui.dialog;
+
+import android.view.LayoutInflater;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.FragmentActivity;
+
+import com.fongmi.android.tv.Setting;
+import com.fongmi.android.tv.databinding.DialogDanmuAlphaBinding;
+import com.fongmi.android.tv.impl.DanmuAlphaCallback;
+import com.fongmi.android.tv.utils.KeyUtil;
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+
+public class DanmuAlphaDialog {
+
+    private final DialogDanmuAlphaBinding binding;
+    private final DanmuAlphaCallback callback;
+    private final AlertDialog dialog;
+
+    public static DanmuAlphaDialog create(FragmentActivity activity) {
+        return new DanmuAlphaDialog(activity);
+    }
+
+    public DanmuAlphaDialog(FragmentActivity activity) {
+        this.callback = (DanmuAlphaCallback) activity;
+        this.binding = DialogDanmuAlphaBinding.inflate(LayoutInflater.from(activity));
+        this.dialog = new MaterialAlertDialogBuilder(activity).setView(binding.getRoot()).create();
+    }
+
+    public void show() {
+        initDialog();
+        initView();
+        initEvent();
+    }
+
+    private void initDialog() {
+        dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
+        dialog.show();
+    }
+
+    private void initView() {
+        binding.slider.setValue(Setting.getDanmuAlpha());
+    }
+
+    private void initEvent() {
+        binding.slider.addOnChangeListener((slider, value, fromUser) -> callback.setDanmuAlpha((int) value));
+        binding.slider.setOnKeyListener((view, keyCode, event) -> {
+            boolean enter = KeyUtil.isEnterKey(event);
+            if (enter) dialog.dismiss();
+            return enter;
+        });
+    }
+}
diff --git a/app/src/leanback/res/layout/activity_setting_player.xml b/app/src/leanback/res/layout/activity_setting_player.xml
index 60af0a1a9..c88f12b12 100644
--- a/app/src/leanback/res/layout/activity_setting_player.xml
+++ b/app/src/leanback/res/layout/activity_setting_player.xml
@@ -262,6 +262,44 @@
 
         </LinearLayout>
 
+        <LinearLayout
+            android:id="@+id/danmuAlpha"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="16dp"
+            android:background="@drawable/selector_item"
+            android:focusable="true"
+            android:focusableInTouchMode="true"
+            android:orientation="horizontal">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginEnd="16dp"
+                android:text="@string/player_danmu_alpha"
+                android:textColor="@color/white"
+                android:textSize="18sp" />
+
+            <TextView
+                android:id="@+id/danmuAlphaText"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:gravity="end"
+                android:textColor="@color/white"
+                android:textSize="18sp"
+                tools:text="80" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="4dp"
+                android:text="%"
+                android:textColor="@color/white"
+                android:textSize="18sp" />
+
+        </LinearLayout>
+
         <LinearLayout
             android:id="@+id/flag"
             android:layout_width="match_parent"
diff --git a/app/src/leanback/res/layout/dialog_danmu_alpha.xml b/app/src/leanback/res/layout/dialog_danmu_alpha.xml
new file mode 100644
index 000000000..b9ed04fee
--- /dev/null
+++ b/app/src/leanback/res/layout/dialog_danmu_alpha.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="48dp">
+
+    <com.google.android.material.slider.Slider
+        android:id="@+id/slider"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:stepSize="5"
+        android:valueFrom="10"
+        android:valueTo="100"
+        app:thumbColor="@color/blue_500"
+        app:trackColorActive="@color/blue_500"
+        app:trackColorInactive="@color/blue_50" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/leanback/res/layout/dialog_danmu_size.xml b/app/src/leanback/res/layout/dialog_danmu_size.xml
index a214a1de9..b75150c73 100644
--- a/app/src/leanback/res/layout/dialog_danmu_size.xml
+++ b/app/src/leanback/res/layout/dialog_danmu_size.xml
@@ -10,7 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:stepSize="0.2"
-        android:valueFrom="1"
+        android:valueFrom="0.6"
         android:valueTo="2"
         app:thumbColor="@color/blue_500"
         app:trackColorActive="@color/blue_500"
diff --git a/app/src/main/java/com/fongmi/android/tv/Setting.java b/app/src/main/java/com/fongmi/android/tv/Setting.java
index 7ec60b619..546dac0fc 100644
--- a/app/src/main/java/com/fongmi/android/tv/Setting.java
+++ b/app/src/main/java/com/fongmi/android/tv/Setting.java
@@ -258,7 +258,7 @@ public class Setting {
     }
 
     public static float getDanmuSize() {
-        return Math.min(Math.max(Prefers.getFloat("danmu_size"), 1.0f), 2.0f);
+        return Math.min(Math.max(Prefers.getFloat("danmu_size", 1.0f), 0.5f), 2.0f);
     }
 
     public static void putDanmuSize(float size) {
@@ -266,7 +266,15 @@ public class Setting {
     }
 
     public static int getDanmuLine(int line) {
-        return Math.min(Math.max(Prefers.getInt("danmu_line"), line), 15);
+        return Math.min(Math.max(Prefers.getInt("danmu_line", line), 1), 15);
+    }
+
+    public static void putDanmuAlpha(int alpha) {
+        Prefers.put("danmu_alpha", alpha);
+    }
+
+    public static int getDanmuAlpha() {
+        return Math.min(Math.max(Prefers.getInt("danmu_alpha", 90), 10), 100);
     }
 
     public static void putDanmuLine(int line) {
diff --git a/app/src/main/java/com/fongmi/android/tv/impl/DanmuAlphaCallback.java b/app/src/main/java/com/fongmi/android/tv/impl/DanmuAlphaCallback.java
new file mode 100644
index 000000000..a342b93fc
--- /dev/null
+++ b/app/src/main/java/com/fongmi/android/tv/impl/DanmuAlphaCallback.java
@@ -0,0 +1,6 @@
+package com.fongmi.android.tv.impl;
+
+public interface DanmuAlphaCallback {
+
+    void setDanmuAlpha(int alpha);
+}
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index bc6120b0f..17651cf41 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -87,6 +87,7 @@
     <string name="player_danmu_speed">弹幕速度</string>
     <string name="player_danmu_size">弹幕大小</string>
     <string name="player_danmu_line">弹幕行数</string>
+    <string name="player_danmu_alpha">弹幕透明</string>
     <string name="player_background">后台播放</string>
     <string name="player_flag">线路播放</string>
     <string name="player_episode">选集样式</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 177eade14..cd3433274 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -87,6 +87,7 @@
     <string name="player_danmu_speed">彈幕速度</string>
     <string name="player_danmu_size">彈幕大小</string>
     <string name="player_danmu_line">彈幕行數</string>
+    <string name="player_danmu_alpha">彈幕透明</string>
     <string name="player_background">背景播放</string>
     <string name="player_flag">線路播放</string>
     <string name="player_episode">選集樣式</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 849c6e445..9567b70b2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -87,6 +87,7 @@
     <string name="player_danmu_speed">Danmu speed</string>
     <string name="player_danmu_size">Danmu size</string>
     <string name="player_danmu_line">Danmu line</string>
+    <string name="player_danmu_alpha">Danmu alpha</string>
     <string name="player_background">Background play</string>
     <string name="player_flag">Flag play</string>
     <string name="player_episode">Episode style</string>
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/activity/VideoActivity.java b/app/src/mobile/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
index 948d4729a..e5f769874 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/activity/VideoActivity.java
@@ -413,6 +413,7 @@ public class VideoActivity extends BaseActivity implements Clock.Callback, Custo
 
     private void setDanmuView() {
         int maxLine = Setting.getDanmuLine(2);
+        float alpha = ((float) Setting.getDanmuAlpha()) / 100.0f;
         mPlayers.setDanmuView(mBinding.danmaku);
         HashMap<Integer, Integer> maxLines = new HashMap<>();
         float scrollSpeedFactor = 1.6f - (Setting.getDanmuSpeed() * 0.2f);
@@ -421,7 +422,7 @@ public class VideoActivity extends BaseActivity implements Clock.Callback, Custo
         maxLines.put(BaseDanmaku.TYPE_SCROLL_RL, maxLine);
         maxLines.put(BaseDanmaku.TYPE_SCROLL_LR, maxLine);
         maxLines.put(BaseDanmaku.TYPE_FIX_BOTTOM, maxLine);
-        mDanmakuContext.setDanmakuStyle(IDisplayer.DANMAKU_STYLE_STROKEN, 3).setMaximumLines(maxLines).setScrollSpeedFactor(scrollSpeedFactor).setDanmakuMargin(8).setScaleTextSize(0.8f);
+        mDanmakuContext.setDanmakuStyle(IDisplayer.DANMAKU_STYLE_STROKEN, 3).setMaximumLines(maxLines).setScrollSpeedFactor(scrollSpeedFactor).setDanmakuTransparency(alpha).setDanmakuMargin(8).setScaleTextSize(0.8f);
         checkDanmuImg();
     }
 
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java
new file mode 100644
index 000000000..b84470bb1
--- /dev/null
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/dialog/DanmuAlphaDialog.java
@@ -0,0 +1,54 @@
+package com.fongmi.android.tv.ui.dialog;
+
+import android.content.DialogInterface;
+import android.view.LayoutInflater;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+
+import com.fongmi.android.tv.R;
+import com.fongmi.android.tv.Setting;
+import com.fongmi.android.tv.databinding.DialogDanmuAlphaBinding;
+import com.fongmi.android.tv.impl.DanmuAlphaCallback;
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+
+public class DanmuAlphaDialog {
+
+    private final DialogDanmuAlphaBinding binding;
+    private final DanmuAlphaCallback callback;
+    private int value;
+
+    public static DanmuAlphaDialog create(Fragment fragment) {
+        return new DanmuAlphaDialog(fragment);
+    }
+
+    public DanmuAlphaDialog(Fragment fragment) {
+        this.callback = (DanmuAlphaCallback) fragment;
+        this.binding = DialogDanmuAlphaBinding.inflate(LayoutInflater.from(fragment.getContext()));
+    }
+
+    public void show() {
+        initDialog();
+        initView();
+    }
+
+    private void initDialog() {
+        AlertDialog dialog = new MaterialAlertDialogBuilder(binding.getRoot().getContext()).setTitle(R.string.player_danmu_alpha).setView(binding.getRoot()).setPositiveButton(R.string.dialog_positive, this::onPositive).setNegativeButton(R.string.dialog_negative, this::onNegative).create();
+        dialog.getWindow().setDimAmount(0);
+        dialog.show();
+    }
+
+    private void initView() {
+        binding.slider.setValue(value = Setting.getDanmuAlpha());
+    }
+
+    private void onPositive(DialogInterface dialog, int which) {
+        callback.setDanmuAlpha((int) binding.slider.getValue());
+        dialog.dismiss();
+    }
+
+    private void onNegative(DialogInterface dialog, int which) {
+        callback.setDanmuAlpha(value);
+        dialog.dismiss();
+    }
+}
diff --git a/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/SettingPlayerFragment.java b/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/SettingPlayerFragment.java
index acba0aa90..f40deedc7 100644
--- a/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/SettingPlayerFragment.java
+++ b/app/src/mobile/java/com/fongmi/android/tv/ui/fragment/SettingPlayerFragment.java
@@ -14,6 +14,7 @@ import com.fongmi.android.tv.R;
 import com.fongmi.android.tv.Setting;
 import com.fongmi.android.tv.databinding.FragmentSettingPlayerBinding;
 import com.fongmi.android.tv.impl.BufferCallback;
+import com.fongmi.android.tv.impl.DanmuAlphaCallback;
 import com.fongmi.android.tv.impl.DanmuLineCallback;
 import com.fongmi.android.tv.impl.DanmuSizeCallback;
 import com.fongmi.android.tv.impl.SubtitleCallback;
@@ -22,6 +23,7 @@ import com.fongmi.android.tv.player.ExoUtil;
 import com.fongmi.android.tv.player.Players;
 import com.fongmi.android.tv.ui.base.BaseFragment;
 import com.fongmi.android.tv.ui.dialog.BufferDialog;
+import com.fongmi.android.tv.ui.dialog.DanmuAlphaDialog;
 import com.fongmi.android.tv.ui.dialog.DanmuLineDialog;
 import com.fongmi.android.tv.ui.dialog.DanmuSizeDialog;
 import com.fongmi.android.tv.ui.dialog.SubtitleDialog;
@@ -29,7 +31,7 @@ import com.fongmi.android.tv.ui.dialog.UaDialog;
 import com.fongmi.android.tv.utils.ResUtil;
 import com.google.android.material.dialog.MaterialAlertDialogBuilder;
 
-public class SettingPlayerFragment extends BaseFragment implements UaCallback, BufferCallback, SubtitleCallback, DanmuLineCallback, DanmuSizeCallback {
+public class SettingPlayerFragment extends BaseFragment implements UaCallback, BufferCallback, SubtitleCallback, DanmuLineCallback, DanmuSizeCallback, DanmuAlphaCallback {
 
     private FragmentSettingPlayerBinding mBinding;
     private String[] danmuSpeed;
@@ -64,6 +66,7 @@ public class SettingPlayerFragment extends BaseFragment implements UaCallback, B
         mBinding.subtitleText.setText(String.valueOf(Setting.getSubtitle()));
         mBinding.danmuSizeText.setText(String.valueOf(Setting.getDanmuSize()));
         mBinding.danmuLineText.setText(String.valueOf(Setting.getDanmuLine(2)));
+        mBinding.danmuAlphaText.setText(String.valueOf(Setting.getDanmuAlpha()));
         mBinding.flagText.setText((flag = ResUtil.getStringArray(R.array.select_flag))[Setting.getFlag()]);
         mBinding.httpText.setText((http = ResUtil.getStringArray(R.array.select_exo_http))[Setting.getHttp()]);
         mBinding.scaleText.setText((scale = ResUtil.getStringArray(R.array.select_scale))[Setting.getScale()]);
@@ -89,6 +92,7 @@ public class SettingPlayerFragment extends BaseFragment implements UaCallback, B
         mBinding.caption.setOnLongClickListener(this::onCaption);
         mBinding.danmuSize.setOnClickListener(this::onDanmuSize);
         mBinding.danmuLine.setOnClickListener(this::onDanmuLine);
+        mBinding.danmuAlpha.setOnClickListener(this::onDanmuAlpha);
         mBinding.danmuSpeed.setOnClickListener(this::onDanmuSpeed);
         mBinding.background.setOnClickListener(this::onBackground);
     }
@@ -206,6 +210,16 @@ public class SettingPlayerFragment extends BaseFragment implements UaCallback, B
         }).show();
     }
 
+    public void onDanmuAlpha(View view) {
+        DanmuAlphaDialog.create(this).show();
+    }
+
+    @Override
+    public void setDanmuAlpha(int alpha) {
+        mBinding.danmuAlphaText.setText(String.valueOf(alpha));
+        Setting.putDanmuAlpha(alpha);
+    }
+
     private void onBackground(View view) {
         new MaterialAlertDialogBuilder(getActivity()).setTitle(R.string.player_background).setNegativeButton(R.string.dialog_negative, null).setSingleChoiceItems(background, Setting.getBackground(), (dialog, which) -> {
             mBinding.backgroundText.setText(background[which]);
diff --git a/app/src/mobile/res/layout/dialog_danmu_alpha.xml b/app/src/mobile/res/layout/dialog_danmu_alpha.xml
new file mode 100644
index 000000000..7d86652c9
--- /dev/null
+++ b/app/src/mobile/res/layout/dialog_danmu_alpha.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:paddingStart="24dp"
+    android:paddingTop="16dp"
+    android:paddingEnd="24dp">
+
+    <com.google.android.material.slider.Slider
+        android:id="@+id/slider"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:stepSize="5"
+        android:valueFrom="10"
+        android:valueTo="100"
+        app:trackColorInactive="@color/blue_50" />
+
+</LinearLayout>
\ No newline at end of file
diff --git a/app/src/mobile/res/layout/dialog_danmu_size.xml b/app/src/mobile/res/layout/dialog_danmu_size.xml
index bfb7ca58c..f4eb98aaa 100644
--- a/app/src/mobile/res/layout/dialog_danmu_size.xml
+++ b/app/src/mobile/res/layout/dialog_danmu_size.xml
@@ -13,7 +13,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:stepSize="0.2"
-        android:valueFrom="1"
+        android:valueFrom="0.6"
         android:valueTo="2"
         app:trackColorInactive="@color/blue_50" />
 
diff --git a/app/src/mobile/res/layout/fragment_setting_player.xml b/app/src/mobile/res/layout/fragment_setting_player.xml
index afa0873f8..ccd3802e7 100644
--- a/app/src/mobile/res/layout/fragment_setting_player.xml
+++ b/app/src/mobile/res/layout/fragment_setting_player.xml
@@ -282,6 +282,42 @@
 
             </LinearLayout>
 
+            <LinearLayout
+                android:id="@+id/danmuAlpha"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:background="@drawable/shape_item"
+                android:orientation="horizontal">
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginEnd="16dp"
+                    android:text="@string/player_danmu_alpha"
+                    android:textColor="@color/white"
+                    android:textSize="16sp" />
+
+                <TextView
+                    android:id="@+id/danmuAlphaText"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:gravity="end"
+                    android:textColor="@color/white"
+                    android:textSize="16sp"
+                    tools:text="1" />
+
+                <TextView
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="4dp"
+                    android:text="%"
+                    android:textColor="@color/white"
+                    android:textSize="16sp" />
+
+            </LinearLayout>
+
             <LinearLayout
                 android:id="@+id/background"
                 android:layout_width="match_parent"