diff --git a/app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt b/app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt
index df88392a1..f485ab7be 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt
@@ -10,8 +10,8 @@ import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookSource
 import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.BookHelp
-import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.help.config.AppConfig
+import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.model.localBook.EpubFile
 import io.legado.app.utils.BitmapUtils
 import io.legado.app.utils.FileUtils
@@ -20,8 +20,6 @@ import kotlinx.coroutines.withContext
 import splitties.init.appCtx
 import java.io.File
 import java.io.FileOutputStream
-import kotlin.math.max
-import kotlin.math.min
 
 object ImageProvider {
 
@@ -33,7 +31,7 @@ object ImageProvider {
      *缓存bitmap LruCache实现
      */
     private const val M = 1024 * 1024
-    private val cacheSize = AppConfig.bitmapCacheSize * M
+    val cacheSize get() = AppConfig.bitmapCacheSize * M
     val bitmapLruCache = object : LruCache<String, Bitmap>(cacheSize) {
 
         override fun sizeOf(key: String, bitmap: Bitmap): Int {
diff --git a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
index 03ea90822..9f9f9e038 100644
--- a/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/config/OtherConfigFragment.kt
@@ -21,6 +21,7 @@ import io.legado.app.lib.theme.primaryColor
 import io.legado.app.model.CheckSource
 import io.legado.app.receiver.SharedReceiverActivity
 import io.legado.app.service.WebService
+import io.legado.app.ui.book.read.page.provider.ImageProvider
 import io.legado.app.ui.document.HandleFileContract
 import io.legado.app.ui.widget.number.NumberPickerDialog
 import io.legado.app.utils.*
@@ -106,7 +107,6 @@ class OtherConfigFragment : PreferenceFragment(),
             PreferKey.uploadRule -> showDialogFragment<DirectLinkUploadConfig>()
             PreferKey.checkSource -> showDialogFragment<CheckSourceConfig>()
             PreferKey.bitmapCacheSize -> {
-                toastOnUi(R.string.restart_to_apply_changes)
                 NumberPickerDialog(requireContext())
                     .setTitle(getString(R.string.bitmap_cache_size))
                     .setMaxValue(9999)
@@ -114,6 +114,7 @@ class OtherConfigFragment : PreferenceFragment(),
                     .setValue(AppConfig.bitmapCacheSize)
                     .show {
                         AppConfig.bitmapCacheSize = it
+                        ImageProvider.bitmapLruCache.resize(ImageProvider.cacheSize)
                     }
             }
         }