diff --git a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
index b4e889b96..58d687f3f 100644
--- a/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/changesource/ChangeSourceViewModel.kt
@@ -16,17 +16,22 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
     var name: String = ""
     var author: String = ""
     val searchBookData = MutableLiveData<List<SearchBook>>()
-    private val searchBooks = arrayListOf<SearchBook>()
+    private val searchBooks = linkedSetOf<SearchBook>()
 
     fun initData() {
         execute {
             App.db.searchBookDao().getByNameAuthorEnable(name, author).let {
                 searchBooks.addAll(it)
-                searchBookData.postValue(searchBooks)
+                searchBookData.postValue(it)
+                search()
             }
         }
     }
 
+    fun upAdapter() {
+
+    }
+
     fun search() {
         execute {
             val bookSourceList = App.db.bookSourceDao().allEnabled
@@ -80,7 +85,7 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
 
     fun screen(key: String?) {
         if (key.isNullOrEmpty()) {
-            searchBookData.postValue(searchBooks)
+            searchBookData.postValue(searchBooks.toList())
         } else {
 
         }
diff --git a/app/src/main/java/io/legado/app/ui/changesource/DiffCallBack.kt b/app/src/main/java/io/legado/app/ui/changesource/DiffCallBack.kt
new file mode 100644
index 000000000..2183c51e5
--- /dev/null
+++ b/app/src/main/java/io/legado/app/ui/changesource/DiffCallBack.kt
@@ -0,0 +1,27 @@
+package io.legado.app.ui.changesource
+
+import androidx.recyclerview.widget.DiffUtil
+import io.legado.app.data.entities.SearchBook
+
+class DiffCallBack(private val oldItems: List<SearchBook>, private val newItems: List<SearchBook>) :
+    DiffUtil.Callback() {
+
+
+    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return oldItems[oldItemPosition].bookUrl == newItems[newItemPosition].bookUrl
+    }
+
+    override fun getOldListSize(): Int {
+        return oldItems.size
+    }
+
+    override fun getNewListSize(): Int {
+        return newItems.size
+    }
+
+    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        return oldItems[oldItemPosition].originName == newItems[newItemPosition].originName
+                && oldItems[oldItemPosition].latestChapterTitle == newItems[newItemPosition].originName
+    }
+
+}
\ No newline at end of file