diff --git a/app/src/main/java/io/legado/app/constant/PreferKey.kt b/app/src/main/java/io/legado/app/constant/PreferKey.kt
index b3c6f6d68..3e28526c5 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -45,6 +45,7 @@ object PreferKey {
     const val readBodyToLh = "readBodyToLh"
     const val textFullJustify = "textFullJustify"
     const val autoReadSpeed = "autoReadSpeed"
+    const val barElevation = "barElevation"
 
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"
diff --git a/app/src/main/java/io/legado/app/help/AppConfig.kt b/app/src/main/java/io/legado/app/help/AppConfig.kt
index 5e98ae482..bf8713c8c 100644
--- a/app/src/main/java/io/legado/app/help/AppConfig.kt
+++ b/app/src/main/java/io/legado/app/help/AppConfig.kt
@@ -125,11 +125,11 @@ object AppConfig {
     var elevation: Int
         @SuppressLint("PrivateResource")
         get() = App.INSTANCE.getPrefInt(
-            "elevation",
+            PreferKey.barElevation,
             App.INSTANCE.resources.getDimension(R.dimen.design_appbar_elevation).toInt()
         )
         set(value) {
-            App.INSTANCE.putPrefInt("elevation", value)
+            App.INSTANCE.putPrefInt(PreferKey.barElevation, value)
         }
 
     val autoChangeSource: Boolean get() = App.INSTANCE.getPrefBoolean("autoChangeSource", true)
diff --git a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
index 81fc16204..6d9d94027 100644
--- a/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/ThemeConfigFragment.kt
@@ -38,7 +38,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(),
                 preferenceScreen.removePreference(it)
             }
         }
-        upPreferenceSummary("barElevation", AppConfig.elevation.toString())
+        upPreferenceSummary(PreferKey.barElevation, AppConfig.elevation.toString())
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -133,7 +133,7 @@ class ThemeConfigFragment : PreferenceFragmentCompat(),
     override fun onPreferenceTreeClick(preference: Preference?): Boolean {
         when (preference?.key) {
             "defaultTheme" -> changeTheme()
-            "barElevation" -> NumberPickerDialog(requireContext())
+            PreferKey.barElevation -> NumberPickerDialog(requireContext())
                 .setTitle(getString(R.string.bar_elevation))
                 .setMaxValue(32)
                 .setMinValue(0)
@@ -231,7 +231,8 @@ class ThemeConfigFragment : PreferenceFragmentCompat(),
     private fun upPreferenceSummary(preferenceKey: String, value: String?) {
         val preference = findPreference<Preference>(preferenceKey) ?: return
         when (preferenceKey) {
-            "barElevation" -> preference.summary = getString(R.string.bar_elevation_s, value)
+            PreferKey.barElevation -> preference.summary =
+                getString(R.string.bar_elevation_s, value)
         }
     }
 }
\ No newline at end of file