diff --git a/app/src/main/java/io/legado/app/constant/AppLog.kt b/app/src/main/java/io/legado/app/constant/AppLog.kt
new file mode 100644
index 000000000..038027342
--- /dev/null
+++ b/app/src/main/java/io/legado/app/constant/AppLog.kt
@@ -0,0 +1,24 @@
+package io.legado.app.constant
+
+import android.annotation.SuppressLint
+import java.text.SimpleDateFormat
+import java.util.*
+
+object AppLog {
+
+    @SuppressLint("ConstantLocale")
+    private val logTimeFormat = SimpleDateFormat("[mm:ss.SSS]", Locale.getDefault())
+
+    val logs = arrayListOf<String>()
+
+    fun addLog(log: String?) {
+        log ?: return
+        synchronized(logs) {
+            if (logs.size > 1000) {
+                logs.removeLastOrNull()
+            }
+            logs.add(0, logTimeFormat.format(Date()) + " " + log)
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/model/CacheBook.kt b/app/src/main/java/io/legado/app/model/CacheBook.kt
index ab88bbfab..8515e6541 100644
--- a/app/src/main/java/io/legado/app/model/CacheBook.kt
+++ b/app/src/main/java/io/legado/app/model/CacheBook.kt
@@ -1,7 +1,7 @@
 package io.legado.app.model
 
-import android.annotation.SuppressLint
 import android.content.Context
+import io.legado.app.constant.AppLog
 import io.legado.app.constant.EventBus
 import io.legado.app.constant.IntentAction
 import io.legado.app.data.appDb
@@ -15,8 +15,6 @@ import io.legado.app.utils.postEvent
 import io.legado.app.utils.startService
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.delay
-import java.text.SimpleDateFormat
-import java.util.*
 import java.util.concurrent.ConcurrentHashMap
 import kotlin.coroutines.CoroutineContext
 
@@ -24,12 +22,8 @@ class CacheBook(var bookSource: BookSource, var book: Book) {
 
     companion object {
 
-        val logs = arrayListOf<String>()
         val cacheBookMap = ConcurrentHashMap<String, CacheBook>()
 
-        @SuppressLint("ConstantLocale")
-        private val logTimeFormat = SimpleDateFormat("[mm:ss.SSS]", Locale.getDefault())
-
         @Synchronized
         fun getOrCreate(bookUrl: String): CacheBook? {
             val book = appDb.bookDao.getBook(bookUrl) ?: return null
@@ -60,16 +54,6 @@ class CacheBook(var bookSource: BookSource, var book: Book) {
             return cacheBook
         }
 
-        fun addLog(log: String?) {
-            log ?: return
-            synchronized(logs) {
-                if (logs.size > 1000) {
-                    logs.removeLastOrNull()
-                }
-                logs.add(0, logTimeFormat.format(Date()) + " " + log)
-            }
-        }
-
         fun start(context: Context, bookUrl: String, start: Int, end: Int) {
             context.startService<CacheBookService> {
                 action = IntentAction.start
@@ -185,7 +169,7 @@ class CacheBook(var bookSource: BookSource, var book: Book) {
         if (errorDownloadMap[index] ?: 0 < 3) {
             waitDownloadSet.add(index)
         } else {
-            addLog("${book.name}-${chapterTitle} ${error.localizedMessage}")
+            AppLog.addLog("${book.name}-${chapterTitle} ${error.localizedMessage}")
         }
     }
 
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 b23f4e0b5..d90147355 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
@@ -11,6 +11,7 @@ import io.legado.app.R
 import io.legado.app.base.VMBaseActivity
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.AppConst.charsets
+import io.legado.app.constant.AppLog
 import io.legado.app.constant.EventBus
 import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
@@ -136,7 +137,7 @@ class CacheActivity : VMBaseActivity<ActivityCacheBookBinding, CacheViewModel>()
             R.id.menu_export_type -> showExportTypeConfig()
             R.id.menu_export_charset -> showCharsetConfig()
             R.id.menu_log ->
-                TextListDialog.show(supportFragmentManager, getString(R.string.log), CacheBook.logs)
+                TextListDialog.show(supportFragmentManager, getString(R.string.log), AppLog.logs)
             else -> if (item.groupId == R.id.menu_group) {
                 binding.titleBar.subtitle = item.title
                 groupId = appDb.bookGroupDao.getByName(item.title.toString())?.groupId ?: 0