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 729225d5f..4b949fe4e 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -50,6 +50,7 @@ object PreferKey {
     const val barElevation = "barElevation"
     const val transparentStatusBar = "transparentStatusBar"
     const val defaultCover = "defaultCover"
+    const val replaceEnableDefault = "replaceEnableDefault"
 
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"
diff --git a/app/src/main/java/io/legado/app/data/entities/Book.kt b/app/src/main/java/io/legado/app/data/entities/Book.kt
index 4ab350534..33d5d309b 100644
--- a/app/src/main/java/io/legado/app/data/entities/Book.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Book.kt
@@ -8,6 +8,7 @@ import androidx.room.PrimaryKey
 import io.legado.app.App
 import io.legado.app.constant.AppPattern
 import io.legado.app.constant.BookType
+import io.legado.app.help.AppConfig
 import io.legado.app.service.help.ReadBook
 import io.legado.app.utils.GSON
 import io.legado.app.utils.fromJsonObject
@@ -51,7 +52,7 @@ data class Book(
     var canUpdate: Boolean = true,              // 刷新书架时更新书籍信息
     var order: Int = 0,                         // 手动排序
     var originOrder: Int = 0,                   //书源排序
-    var useReplaceRule: Boolean = true,         // 正文使用净化替换规则
+    var useReplaceRule: Boolean = AppConfig.replaceEnableDefault,         // 正文使用净化替换规则
     var variable: String? = null                // 自定义书籍变量信息(用于书源规则检索书籍信息)
 ) : Parcelable, BaseBook {
 
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 0c4851f61..8157af173 100644
--- a/app/src/main/java/io/legado/app/help/AppConfig.kt
+++ b/app/src/main/java/io/legado/app/help/AppConfig.kt
@@ -132,6 +132,9 @@ object AppConfig {
             App.INSTANCE.putPrefInt(PreferKey.barElevation, value)
         }
 
+    var replaceEnableDefault: Boolean =
+        App.INSTANCE.getPrefBoolean(PreferKey.replaceEnableDefault, true)
+
     val autoChangeSource: Boolean get() = App.INSTANCE.getPrefBoolean("autoChangeSource", true)
 
     val readBodyToLh: Boolean get() = App.INSTANCE.getPrefBoolean(PreferKey.readBodyToLh, true)
diff --git a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
index 34e629e33..57611e8ad 100644
--- a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
@@ -22,6 +22,7 @@ import io.legado.app.help.AppConfig
 import io.legado.app.help.permission.Permissions
 import io.legado.app.help.permission.PermissionsCompat
 import io.legado.app.lib.dialogs.alert
+import io.legado.app.lib.theme.bottomBackground
 import io.legado.app.ui.filechooser.FileChooserDialog
 import io.legado.app.ui.filechooser.FilePicker
 import io.legado.app.utils.*
@@ -58,6 +59,7 @@ class FontSelectDialog : BaseDialogFragment(),
     }
 
     override fun onFragmentCreated(view: View, savedInstanceState: Bundle?) {
+        tool_bar.setBackgroundColor(requireContext().bottomBackground)
         tool_bar.setTitle(R.string.select_font)
         tool_bar.inflateMenu(R.menu.font_select)
         tool_bar.setOnMenuItemClickListener(this)
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index c99435181..0f81aabf4 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -729,4 +729,6 @@
     <string name="group_name">分組名稱</string>
     <string name="note_content">備註內容</string>
     <string name="e_ink_change_bg">E-Ink模式下只有白纸黑字,不显示其它背景</string>
+    <string name="replace_enable_default_t">默认启用替换净化</string>
+    <string name="replace_enable_default_s">新加入书架的书是否启用替换净化</string>
 </resources>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index cb1451086..214049b79 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -729,5 +729,7 @@
     <string name="group_name">分組名稱</string>
     <string name="note_content">備註內容</string>
     <string name="e_ink_change_bg">E-Ink模式下只有白纸黑字,不显示其它背景</string>
+    <string name="replace_enable_default_t">默认启用替换净化</string>
+    <string name="replace_enable_default_s">新加入书架的书是否启用替换净化</string>
 
 </resources>
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index 7f3b79003..197cd7633 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -729,4 +729,6 @@
     <string name="group_name">分组名称</string>
     <string name="note_content">备注内容</string>
     <string name="e_ink_change_bg">E-Ink模式下只有白纸黑字,不显示其它背景</string>
+    <string name="replace_enable_default_t">默认启用替换净化</string>
+    <string name="replace_enable_default_s">新加入书架的书是否启用替换净化</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 53c6d8adf..444710bf5 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -730,5 +730,7 @@
     <string name="group_name">Group name</string>
     <string name="note_content">Remarks section</string>
     <string name="e_ink_change_bg">E-Ink模式下只有白纸黑字,不显示其它背景</string>
+    <string name="replace_enable_default_t">默认启用替换净化</string>
+    <string name="replace_enable_default_s">新加入书架的书是否启用替换净化</string>
 
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/pref_config_other.xml b/app/src/main/res/xml/pref_config_other.xml
index e906b984b..3d3752da1 100644
--- a/app/src/main/res/xml/pref_config_other.xml
+++ b/app/src/main/res/xml/pref_config_other.xml
@@ -45,6 +45,13 @@
         app:allowDividerBelow="false"
         app:iconSpaceReserved="false">
 
+        <io.legado.app.ui.widget.prefs.SwitchPreference
+            android:defaultValue="true"
+            android:key="replaceEnableDefault"
+            android:title="@string/replace_enable_default_t"
+            android:summary="@string/replace_enable_default_s"
+            app:iconSpaceReserved="false" />
+
         <io.legado.app.ui.widget.prefs.Preference
             android:key="threadCount"
             android:title="@string/threads_num_title"