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 588ca8581..ccb32a3af 100644
--- a/app/src/main/java/io/legado/app/constant/PreferKey.kt
+++ b/app/src/main/java/io/legado/app/constant/PreferKey.kt
@@ -82,6 +82,7 @@ object PreferKey {
     const val syncBookProgress = "syncBookProgress"
     const val cronet = "Cronet"
     const val antiAlias = "antiAlias"
+    const val bitmapCacheSize = "bitmapCacheSize"
     const val preDownloadNum = "preDownloadNum"
     const val autoRefresh = "auto_refresh"
     const val defaultToRead = "defaultToRead"
@@ -107,7 +108,6 @@ object PreferKey {
     const val welcomeShowIcon = "welcomeShowIcon"
     const val welcomeShowIconDark = "welcomeShowIconDark"
 
-
     const val cPrimary = "colorPrimary"
     const val cAccent = "colorAccent"
     const val cBackground = "colorBackground"
@@ -121,4 +121,5 @@ object PreferKey {
     const val cNBBackground = "colorBottomBackgroundNight"
     const val bgImageN = "backgroundImageNight"
     const val bgImageNBlurring = "backgroundImageNightBlurring"
+
 }
diff --git a/app/src/main/java/io/legado/app/help/config/AppConfig.kt b/app/src/main/java/io/legado/app/help/config/AppConfig.kt
index f36decf1d..05e2c80b6 100644
--- a/app/src/main/java/io/legado/app/help/config/AppConfig.kt
+++ b/app/src/main/java/io/legado/app/help/config/AppConfig.kt
@@ -323,5 +323,11 @@ object AppConfig : SharedPreferences.OnSharedPreferenceChangeListener {
         }
         return ua
     }
+
+    var bitmapCacheSize: Int
+        get() = appCtx.getPrefInt(PreferKey.bitmapCacheSize, 50)
+        set(value) {
+            appCtx.putPrefInt(PreferKey.bitmapCacheSize, value)
+        }
 }
 
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 7ecfe83f5..df88392a1 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
@@ -11,6 +11,7 @@ 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.model.localBook.EpubFile
 import io.legado.app.utils.BitmapUtils
 import io.legado.app.utils.FileUtils
@@ -32,8 +33,7 @@ object ImageProvider {
      *缓存bitmap LruCache实现
      */
     private const val M = 1024 * 1024
-    private val cacheSize =
-        max(50 * M, min(100 * M, (Runtime.getRuntime().maxMemory() / 8).toInt()))
+    private val cacheSize = 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 5ffdede56..f65123720 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
@@ -56,6 +56,7 @@ class OtherConfigFragment : PreferenceFragment(),
             upPreferenceSummary(PreferKey.defaultBookTreeUri, it)
         }
         upPreferenceSummary(PreferKey.checkSource, CheckSource.summary)
+        upPreferenceSummary(PreferKey.bitmapCacheSize, AppConfig.bitmapCacheSize.toString())
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
@@ -104,6 +105,14 @@ class OtherConfigFragment : PreferenceFragment(),
             PreferKey.cleanCache -> clearCache()
             PreferKey.uploadRule -> showDialogFragment<DirectLinkUploadConfig>()
             PreferKey.checkSource -> showDialogFragment<CheckSourceConfig>()
+            PreferKey.bitmapCacheSize -> NumberPickerDialog(requireContext())
+                .setTitle(getString(R.string.bitmap_cache_size))
+                .setMaxValue(9999)
+                .setMinValue(1)
+                .setValue(AppConfig.bitmapCacheSize)
+                .show {
+                    AppConfig.bitmapCacheSize = it
+                }
         }
         return super.onPreferenceTreeClick(preference)
     }
@@ -141,6 +150,11 @@ class OtherConfigFragment : PreferenceFragment(),
             PreferKey.checkSource -> listView.post {
                 upPreferenceSummary(PreferKey.checkSource, CheckSource.summary)
             }
+            PreferKey.bitmapCacheSize -> {
+                upPreferenceSummary(key, AppConfig.bitmapCacheSize.toString())
+                // restart to apply changes
+                appCtx.restart()
+            }
         }
     }
 
@@ -151,6 +165,7 @@ class OtherConfigFragment : PreferenceFragment(),
                 getString(R.string.pre_download_s, value)
             PreferKey.threadCount -> preference.summary = getString(R.string.threads_num, value)
             PreferKey.webPort -> preference.summary = getString(R.string.web_port_summary, value)
+            PreferKey.bitmapCacheSize -> preference.summary = getString(R.string.bitmap_cache_size_summary, value)
             else -> if (preference is ListPreference) {
                 val index = preference.findIndexOfValue(value)
                 // Set the summary to reflect the new value.
diff --git a/app/src/main/res/values-es-rES/strings.xml b/app/src/main/res/values-es-rES/strings.xml
index 310ecd7f4..4ff5bd117 100644
--- a/app/src/main/res/values-es-rES/strings.xml
+++ b/app/src/main/res/values-es-rES/strings.xml
@@ -988,5 +988,7 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDavBook</string>
+    <string name="bitmap_cache_size_summary">Current cache max size %1$s MB</string>
+    <string name="bitmap_cache_size">bitmap cache size</string>
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values-ja-rJP/strings.xml b/app/src/main/res/values-ja-rJP/strings.xml
index 68498160f..6e4dcc414 100644
--- a/app/src/main/res/values-ja-rJP/strings.xml
+++ b/app/src/main/res/values-ja-rJP/strings.xml
@@ -991,5 +991,7 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDavBook</string>
+    <string name="bitmap_cache_size_summary">Current cache max size %1$s MB</string>
+    <string name="bitmap_cache_size">bitmap cache size</string>
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values-pt-rBR/strings.xml b/app/src/main/res/values-pt-rBR/strings.xml
index 7551b7740..389fd7309 100644
--- a/app/src/main/res/values-pt-rBR/strings.xml
+++ b/app/src/main/res/values-pt-rBR/strings.xml
@@ -991,5 +991,7 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDavBook</string>
+    <string name="bitmap_cache_size_summary">Current cache max size %1$s MB</string>
+    <string name="bitmap_cache_size">bitmap cache size</string>
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index 6d8cc2c37..80381c88c 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -988,5 +988,8 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDav书籍</string>
+    <string name="bitmap_cache_size_summary">当前最大缓存 %1$s MB</string>
+    <string name="bitmap_cache_size">图片绘制缓存</string>
+
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 3952f76b2..d7026631b 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -990,5 +990,8 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDav书籍</string>
+    <string name="bitmap_cache_size_summary">当前最大缓存 %1$s MB</string>
+    <string name="bitmap_cache_size">图片绘制缓存</string>
+
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values-zh/strings.xml b/app/src/main/res/values-zh/strings.xml
index ca9c6c14b..79233a087 100644
--- a/app/src/main/res/values-zh/strings.xml
+++ b/app/src/main/res/values-zh/strings.xml
@@ -990,5 +990,8 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">上传WebDav</string>
     <string name="add_remote_book">WebDav书籍</string>
+    <string name="bitmap_cache_size_summary">当前最大缓存 %1$s MB</string>
+    <string name="bitmap_cache_size">图片绘制缓存</string>
+
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 93c683137..59d97e45a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -991,5 +991,7 @@
     <string name="download_book_fail">Download Fail</string>
     <string name="upload_to_remote">Upload</string>
     <string name="add_remote_book">WebDavBook</string>
+    <string name="bitmap_cache_size_summary">Current cache max size %1$s MB</string>
+    <string name="bitmap_cache_size">bitmap cache size</string>
     <!-- string end -->
 </resources>
diff --git a/app/src/main/res/xml/pref_config_other.xml b/app/src/main/res/xml/pref_config_other.xml
index 931deb5f9..8da45d5a6 100644
--- a/app/src/main/res/xml/pref_config_other.xml
+++ b/app/src/main/res/xml/pref_config_other.xml
@@ -75,12 +75,18 @@
             android:key="Cronet"
             android:summary="@string/pref_cronet_summary"
             android:title="Cronet" />
+
         <io.legado.app.lib.prefs.SwitchPreference
             android:defaultValue="false"
             android:key="antiAlias"
             android:summary="@string/pref_anti_alias_summary"
             android:title="@string/anti_alias" />
 
+        <io.legado.app.lib.prefs.Preference
+            android:key="bitmapCacheSize"
+            android:summary="@string/bitmap_cache_size_summary"
+            android:title="@string/bitmap_cache_size" />
+
         <io.legado.app.lib.prefs.Preference
             android:key="preDownloadNum"
             android:summary="@string/pre_download_s"