diff --git a/packages/at_backupkey_flutter/lib/utils/size_config.dart b/packages/at_backupkey_flutter/lib/utils/size_config.dart
index 84628d5a..d263e7d0 100644
--- a/packages/at_backupkey_flutter/lib/utils/size_config.dart
+++ b/packages/at_backupkey_flutter/lib/utils/size_config.dart
@@ -33,7 +33,7 @@ class SizeConfig {
     refHeight = height ?? 812;
     refWidth = width ?? 375;
 
-    deviceTextFactor = _mediaQueryData.textScaleFactor;
+    deviceTextFactor = _mediaQueryData.textScaler.scale(20) / 20;
 
     if (screenHeight < 1200) {
       blockSizeHorizontal = screenWidth / 100;