diff --git a/app/src/main/java/io/legado/app/ui/book/read/BaseReadBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/BaseReadBookActivity.kt
index 88ae2f465..2108db6e5 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/BaseReadBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/BaseReadBookActivity.kt
@@ -99,6 +99,7 @@ abstract class BaseReadBookActivity :
             "1" -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
             "2" -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
             "3" -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR
+            "4" -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT
         }
     }
 
diff --git a/app/src/main/res/values-es-rES/arrays.xml b/app/src/main/res/values-es-rES/arrays.xml
index fe92af603..d0b8c0979 100644
--- a/app/src/main/res/values-es-rES/arrays.xml
+++ b/app/src/main/res/values-es-rES/arrays.xml
@@ -59,6 +59,7 @@
 		<item>@string/screen_portrait</item>
 		<item>@string/screen_landscape</item>
 		<item>@string/screen_sensor</item>
+		<item>反向竖屏</item>
 	</string-array>
 
 	<string-array name="icon_names">
diff --git a/app/src/main/res/values-pt-rBR/arrays.xml b/app/src/main/res/values-pt-rBR/arrays.xml
index 4739b9d08..987073362 100644
--- a/app/src/main/res/values-pt-rBR/arrays.xml
+++ b/app/src/main/res/values-pt-rBR/arrays.xml
@@ -59,6 +59,7 @@
 		<item>@string/screen_portrait</item>
 		<item>@string/screen_landscape</item>
 		<item>@string/screen_sensor</item>
+		<item>反向竖屏</item>
 	</string-array>
 
 	<string-array name="icon_names">
diff --git a/app/src/main/res/values/array_values.xml b/app/src/main/res/values/array_values.xml
index a6d6ce6c8..e0b0a88dc 100644
--- a/app/src/main/res/values/array_values.xml
+++ b/app/src/main/res/values/array_values.xml
@@ -31,6 +31,7 @@
         <item>1</item>
         <item>2</item>
         <item>3</item>
+        <item>4</item>
     </string-array>
 
     <string-array name="double_page_value">
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index 7ae91f3d4..6c5608372 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -59,6 +59,7 @@
 		<item>@string/screen_portrait</item>
 		<item>@string/screen_landscape</item>
 		<item>@string/screen_sensor</item>
+		<item>反向竖屏</item>
 	</string-array>
 
 	<string-array name="double_page_title">