diff --git a/app/src/main/java/com/fongmi/android/tv/utils/ImgUtil.java b/app/src/main/java/com/fongmi/android/tv/utils/ImgUtil.java
index 26d1720f5..96273ec46 100644
--- a/app/src/main/java/com/fongmi/android/tv/utils/ImgUtil.java
+++ b/app/src/main/java/com/fongmi/android/tv/utils/ImgUtil.java
@@ -19,12 +19,12 @@ import com.fongmi.android.tv.R;
 public class ImgUtil {
 
     private static int getWidth() {
-        float thumbnail = 1 - Prefers.getThumbnail() * 0.3f;
+        float thumbnail = 0.3f * Prefers.getThumbnail() + 0.4f;
         return ResUtil.dp2px((int) Math.ceil(300 * thumbnail));
     }
 
     private static int getHeight() {
-        float thumbnail = 1 - Prefers.getThumbnail() * 0.3f;
+        float thumbnail = 0.3f * Prefers.getThumbnail() + 0.4f;
         return ResUtil.dp2px((int) Math.ceil(400 * thumbnail));
     }
 
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index ce86432a7..127593579 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -65,9 +65,9 @@
     <string name="error_play">不支援的影片格式</string>
 
     <string-array name="select_thumbnail">
-        <item>高质量</item>
-        <item>中质量</item>
         <item>低质量</item>
+        <item>中质量</item>
+        <item>高质量</item>
     </string-array>
 
     <string-array name="select_scale">
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 4a249d58e..715ca7e76 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -65,9 +65,9 @@
     <string name="error_play">不支援的影片格式</string>
 
     <string-array name="select_thumbnail">
-        <item>高品質</item>
-        <item>中品質</item>
         <item>低品質</item>
+        <item>中品質</item>
+        <item>高品質</item>
     </string-array>
 
     <string-array name="select_scale">
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0016687b1..949346983 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -65,9 +65,9 @@
     <string name="error_play">Unsupported video format</string>
 
     <string-array name="select_thumbnail">
-        <item>High</item>
-        <item>Medium</item>
         <item>Low</item>
+        <item>Medium</item>
+        <item>High</item>
     </string-array>
 
     <string-array name="select_scale">