diff --git a/android/src/main/java/com/ninty/system/setting/SystemSetting.java b/android/src/main/java/com/ninty/system/setting/SystemSetting.java
index dedd524..e145c0c 100644
--- a/android/src/main/java/com/ninty/system/setting/SystemSetting.java
+++ b/android/src/main/java/com/ninty/system/setting/SystemSetting.java
@@ -7,6 +7,7 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.res.Resources;
 import android.location.LocationManager;
 import android.media.AudioManager;
 import android.net.Uri;
@@ -198,6 +199,21 @@ public void onReceive(Context context, Intent intent) {
         }
     }
 
+     private static int getMaxBrightness() {
+        int brightness = 255;
+        try {
+            Resources system = Resources.getSystem();
+            int resId = system.getIdentifier("config_screenBrightnessSettingMaximum", "integer", "android");
+            if (resId != 0) {
+                brightness = system.getInteger(resId);
+            }
+
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return brightness;
+    }
+
     @Override
     public String getName() {
         return SystemSetting.class.getSimpleName();
@@ -222,7 +238,7 @@ public void getScreenMode(Promise promise) {
 
     @ReactMethod
     public void setBrightness(float val, Promise promise) {
-        final int brightness = (int) (val * 255);
+        final int brightness = (int) (val * getMaxBrightness());
         checkAndSet(Settings.System.SCREEN_BRIGHTNESS, brightness, promise);
     }
 
@@ -252,7 +268,7 @@ public void getAppBrightness(Promise promise) {
             float result = curActivity.getWindow().getAttributes().screenBrightness;
             if (result < 0) {
                 int val = Settings.System.getInt(mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
-                promise.resolve(val * 1.0f / 255);
+                promise.resolve(val * 1.0f / getMaxBrightness());
             } else {
                 promise.resolve(result);
             }
@@ -272,7 +288,7 @@ public void openWriteSetting() {
     public void getBrightness(Promise promise) {
         try {
             int val = Settings.System.getInt(mContext.getContentResolver(), Settings.System.SCREEN_BRIGHTNESS);
-            promise.resolve(val * 1.0f / 255);
+            promise.resolve(val * 1.0f / getMaxBrightness());
         } catch (Settings.SettingNotFoundException e) {
             Log.e(TAG, "err", e);
             promise.reject("-1", "get brightness fail", e);