diff --git a/app/src/main/java/io/legado/app/App.kt b/app/src/main/java/io/legado/app/App.kt
index 364f93f96..0d02e0669 100644
--- a/app/src/main/java/io/legado/app/App.kt
+++ b/app/src/main/java/io/legado/app/App.kt
@@ -39,6 +39,8 @@ import io.legado.app.help.LifecycleHelp
 import io.legado.app.help.RuleBigDataHelp
 import io.legado.app.help.book.BookHelp
 import io.legado.app.help.config.AppConfig
+import io.legado.app.help.config.ReadBookConfig
+import io.legado.app.help.config.ThemeConfig
 import io.legado.app.help.config.ThemeConfig.applyDayNight
 import io.legado.app.help.config.ThemeConfig.applyDayNightInit
 import io.legado.app.help.coroutine.Coroutine
@@ -105,6 +107,8 @@ class App : Application() {
             RuleBigDataHelp.clearInvalid()
             BookHelp.clearInvalidCache()
             Backup.clearCache()
+            ReadBookConfig.clearBgAndCache()
+            ThemeConfig.clearBg()
             //初始化简繁转换引擎
             when (AppConfig.chineseConverterType) {
                 1 -> {
diff --git a/app/src/main/java/io/legado/app/help/config/ReadBookConfig.kt b/app/src/main/java/io/legado/app/help/config/ReadBookConfig.kt
index 4d76c781d..49effc231 100644
--- a/app/src/main/java/io/legado/app/help/config/ReadBookConfig.kt
+++ b/app/src/main/java/io/legado/app/help/config/ReadBookConfig.kt
@@ -162,6 +162,25 @@ object ReadBookConfig {
         return false
     }
 
+    fun clearBgAndCache() {
+        val bgs = hashSetOf<String>()
+        configList.forEach { config ->
+            repeat(3) {
+                config.getBgPath(it)?.let { path ->
+                    bgs.add(path)
+                }
+            }
+        }
+        appCtx.externalFiles.getFile("bg").listFiles()?.forEach {
+            if (!bgs.contains(it.absolutePath)) {
+                it.delete()
+            }
+        }
+        FileUtils.delete(appCtx.externalCache.getFile("readConfig"))
+        val configZipPath = FileUtils.getPath(appCtx.externalCache, "readConfig.zip")
+        FileUtils.delete(configZipPath)
+    }
+
     private fun resetAll() {
         DefaultData.readConfigs.let {
             configList.clear()
@@ -704,5 +723,29 @@ object ReadBookConfig {
             }
             return bgDrawable ?: ColorDrawable(appCtx.getCompatColor(R.color.background))
         }
+
+        fun getBgPath(bgIndex: Int): String? {
+            val bgType = when (bgIndex) {
+                0 -> bgType
+                1 -> bgTypeNight
+                2 -> bgTypeEInk
+                else -> error("unknown bgIndex: $bgIndex")
+            }
+            if (bgType != 2) {
+                return null
+            }
+            val bgStr = when (bgIndex) {
+                0 -> bgStr
+                1 -> bgStrNight
+                2 -> bgStrEInk
+                else -> error("unknown bgIndex: $bgIndex")
+            }
+            val path = if (bgStr.contains(File.separator)) {
+                bgStr
+            } else {
+                FileUtils.getPath(appCtx.externalFiles, "bg", bgStr)
+            }
+            return path
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/help/config/ThemeConfig.kt b/app/src/main/java/io/legado/app/help/config/ThemeConfig.kt
index 5e86913d9..d8c9b1b37 100644
--- a/app/src/main/java/io/legado/app/help/config/ThemeConfig.kt
+++ b/app/src/main/java/io/legado/app/help/config/ThemeConfig.kt
@@ -19,9 +19,11 @@ import io.legado.app.utils.BitmapUtils
 import io.legado.app.utils.ColorUtils
 import io.legado.app.utils.FileUtils
 import io.legado.app.utils.GSON
+import io.legado.app.utils.externalFiles
 import io.legado.app.utils.fromJsonArray
 import io.legado.app.utils.fromJsonObject
 import io.legado.app.utils.getCompatColor
+import io.legado.app.utils.getFile
 import io.legado.app.utils.getPrefInt
 import io.legado.app.utils.getPrefString
 import io.legado.app.utils.hexString
@@ -292,6 +294,21 @@ object ThemeConfig {
         }
     }
 
+    fun clearBg() {
+        val bgImagePath = appCtx.getPrefString(PreferKey.bgImage)
+        appCtx.externalFiles.getFile(PreferKey.bgImage).listFiles()?.forEach {
+            if (it.absolutePath != bgImagePath) {
+                it.delete()
+            }
+        }
+        val bgImageNPath = appCtx.getPrefString(PreferKey.bgImageN)
+        appCtx.externalFiles.getFile(PreferKey.bgImageN).listFiles()?.forEach {
+            if (it.absolutePath != bgImageNPath) {
+                it.delete()
+            }
+        }
+    }
+
     @Keep
     data class Config(
         var themeName: String,
diff --git a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
index d8a6182e3..9ec3b6699 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/config/BgTextConfigDialog.kt
@@ -286,38 +286,10 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
                     exportFiles.add(fontExportFile)
                 }
             }
-            if (ReadBookConfig.durConfig.bgType == 2) {
-                val bgName = FileUtils.getName(ReadBookConfig.durConfig.bgStr)
-                val bgFile = File(ReadBookConfig.durConfig.bgStr)
-                if (bgFile.exists()) {
-                    val bgExportFile = File(FileUtils.getPath(configDir, bgName))
-                    if (!bgExportFile.exists()) {
-                        bgFile.copyTo(bgExportFile)
-                        exportFiles.add(bgExportFile)
-                    }
-                }
-            }
-            if (ReadBookConfig.durConfig.bgTypeNight == 2) {
-                val bgName = FileUtils.getName(ReadBookConfig.durConfig.bgStrNight)
-                val bgFile = File(ReadBookConfig.durConfig.bgStrNight)
-                if (bgFile.exists()) {
-                    val bgExportFile = File(FileUtils.getPath(configDir, bgName))
-                    if (!bgExportFile.exists()) {
-                        bgFile.copyTo(bgExportFile)
-                        exportFiles.add(bgExportFile)
-                    }
-                }
-            }
-            if (ReadBookConfig.durConfig.bgTypeEInk == 2) {
-                val bgName = FileUtils.getName(ReadBookConfig.durConfig.bgStrEInk)
-                val bgFile = File(ReadBookConfig.durConfig.bgStrEInk)
-                if (bgFile.exists()) {
-                    val bgExportFile = File(FileUtils.getPath(configDir, bgName))
-                    if (!bgExportFile.exists()) {
-                        bgFile.copyTo(bgExportFile)
-                        exportFiles.add(bgExportFile)
-                    }
-                }
+            repeat(3) {
+                val path = ReadBookConfig.durConfig.getBgPath(it) ?: return@repeat
+                val bgExportFile = copyBgImage(path, configDir) ?: return@repeat
+                exportFiles.add(bgExportFile)
             }
             val configZipPath = FileUtils.getPath(requireContext().externalCache, configFileName)
             if (ZipUtils.zipFiles(exportFiles, File(configZipPath))) {
@@ -346,6 +318,19 @@ class BgTextConfigDialog : BaseDialogFragment(R.layout.dialog_read_bg_text) {
         }
     }
 
+    private fun copyBgImage(path: String, configDir: File): File? {
+        val bgName = FileUtils.getName(path)
+        val bgFile = File(path)
+        if (bgFile.exists()) {
+            val bgExportFile = File(FileUtils.getPath(configDir, bgName))
+            if (!bgExportFile.exists()) {
+                bgFile.copyTo(bgExportFile)
+                return bgExportFile
+            }
+        }
+        return null
+    }
+
     @SuppressLint("InflateParams")
     private fun importNetConfigAlert() {
         alert("输入地址") {