diff --git a/app/src/main/java/io/legado/app/constant/Const.kt b/app/src/main/java/io/legado/app/constant/Const.kt
index 97e267f85..b3500a2ae 100644
--- a/app/src/main/java/io/legado/app/constant/Const.kt
+++ b/app/src/main/java/io/legado/app/constant/Const.kt
@@ -21,6 +21,9 @@ val appInfo: AppInfo by lazy {
     appInfo
 }
 
+val charsets =
+    arrayListOf("UTF-8", "GB2312", "GB18030", "GBK", "Unicode", "UTF-16", "UTF-16LE", "ASCII")
+
 data class AppInfo(
     var versionCode: Long = 0L,
     var versionName: String = ""
diff --git a/app/src/main/java/io/legado/app/ui/book/cache/CacheActivity.kt b/app/src/main/java/io/legado/app/ui/book/cache/CacheActivity.kt
index 3f7f2419f..121f4f114 100644
--- a/app/src/main/java/io/legado/app/ui/book/cache/CacheActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/cache/CacheActivity.kt
@@ -14,6 +14,7 @@ import io.legado.app.base.VMBaseActivity
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.EventBus
 import io.legado.app.constant.PreferKey
+import io.legado.app.constant.charsets
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Book
 import io.legado.app.data.entities.BookChapter
@@ -230,8 +231,6 @@ class CacheActivity : VMBaseActivity<ActivityCacheBookBinding, CacheViewModel>()
     }
 
     private fun showCharsetConfig() {
-        val charsets =
-            arrayListOf("UTF-8", "GB2312", "GBK", "Unicode", "UTF-16", "UTF-16LE", "ASCII")
         alert(R.string.set_charset) {
             val alertBinding = DialogEditTextBinding.inflate(layoutInflater).apply {
                 editView.setFilterValues(charsets)
diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookBaseActivity.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookBaseActivity.kt
index a869d016e..8dde10425 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookBaseActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookBaseActivity.kt
@@ -11,6 +11,7 @@ import androidx.core.view.isVisible
 import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.constant.PreferKey
+import io.legado.app.constant.charsets
 import io.legado.app.data.appDb
 import io.legado.app.data.entities.Bookmark
 import io.legado.app.databinding.ActivityBookReadBinding
@@ -222,8 +223,6 @@ abstract class ReadBookBaseActivity :
     }
 
     fun showCharsetConfig() {
-        val charsets =
-            arrayListOf("UTF-8", "GB2312", "GBK", "Unicode", "UTF-16", "UTF-16LE", "ASCII")
         alert(R.string.set_charset) {
             val alertBinding = DialogEditTextBinding.inflate(layoutInflater).apply {
                 editView.setFilterValues(charsets)