diff --git a/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt b/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
index 7afa40839..779cfd1e2 100644
--- a/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
@@ -59,5 +59,5 @@ interface SearchBookDao {
     fun insert(vararg searchBook: SearchBook): List<Long>
 
     @Query("delete from searchBooks where time < :time")
-    fun clearOld(time: Long)
+    fun clearExpired(time: Long)
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index a4ede48c0..57c368a2c 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -52,17 +52,20 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
     override fun onPostCreate(savedInstanceState: Bundle?) {
         super.onPostCreate(savedInstanceState)
         upVersion()
+        //初始化简繁转换引擎
         when (AppConfig.chineseConverterType) {
             1 -> ZhConverterUtil.toSimple("初始化")
             2 -> ZhConverterUtil.toTraditional("初始化")
         }
+        //自动更新书籍
         if (AppConfig.autoRefreshBook) {
             view_pager_main.postDelayed({
                 viewModel.upChapterList()
             }, 1000)
         }
+        //清楚过期数据
         view_pager_main.postDelayed({
-            viewModel.clearDb()
+            viewModel.clearExpiredData()
         }, 3000)
     }
 
diff --git a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
index 29fa339ea..1a0652bae 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
@@ -54,9 +54,10 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
-    fun clearDb() {
+    fun clearExpiredData() {
         execute {
-            App.db.searchBookDao().clearOld(System.currentTimeMillis() - TimeUnit.DAYS.toMillis(1))
+            App.db.searchBookDao()
+                .clearExpired(System.currentTimeMillis() - TimeUnit.DAYS.toMillis(1))
         }
     }