diff --git a/app/src/main/java/io/legado/app/model/webBook/SearchBookModel.kt b/app/src/main/java/io/legado/app/model/webBook/SearchBookModel.kt
index 0cb36d1c7..c252c567f 100644
--- a/app/src/main/java/io/legado/app/model/webBook/SearchBookModel.kt
+++ b/app/src/main/java/io/legado/app/model/webBook/SearchBookModel.kt
@@ -1,86 +1,109 @@
 package io.legado.app.model.webBook
 
 import io.legado.app.App
+import io.legado.app.data.entities.BookSource
 import io.legado.app.data.entities.SearchBook
 import io.legado.app.help.AppConfig
-import io.legado.app.help.coroutine.Coroutine
+import io.legado.app.help.coroutine.CompositeCoroutine
 import io.legado.app.utils.getPrefString
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
+import kotlinx.coroutines.ExecutorCoroutineDispatcher
 import kotlinx.coroutines.asCoroutineDispatcher
 import java.util.concurrent.Executors
+import kotlin.math.min
 
 class SearchBookModel(private val scope: CoroutineScope, private val callBack: CallBack) {
-    private var searchPool =
-        Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
-    private var mSearchId = System.currentTimeMillis()
+    val threadCount = AppConfig.threadCount
+    private var searchPool: ExecutorCoroutineDispatcher? = null
+    private var mSearchId = 0L
     private var searchPage = 1
     private var searchKey: String = ""
-    private var task: Coroutine<*>? = null
+    private var tasks = CompositeCoroutine()
+    private var bookSourceList = arrayListOf<BookSource>()
+
+    @Volatile
+    private var searchIndex = -1
 
     private fun initSearchPool() {
-        searchPool =
-            Executors.newFixedThreadPool(AppConfig.threadCount).asCoroutineDispatcher()
+        searchPool = Executors.newFixedThreadPool(threadCount).asCoroutineDispatcher()
     }
 
     fun search(searchId: Long, key: String) {
+        callBack.onSearchStart()
         if (searchId != mSearchId) {
-            task?.cancel()
-            searchPool.close()
-            initSearchPool()
-            mSearchId = searchId
-            searchPage = 1
             if (key.isEmpty()) {
+                callBack.onSearchCancel()
                 return
             } else {
                 this.searchKey = key
             }
-        } else {
-            searchPage++
-        }
-        task = Coroutine.async(scope, searchPool) {
+            if (mSearchId != 0L) {
+                close()
+            }
+            initSearchPool()
+            mSearchId = searchId
+            searchPage = 1
             val searchGroup = App.INSTANCE.getPrefString("searchGroup") ?: ""
-            val bookSourceList = if (searchGroup.isBlank()) {
-                App.db.bookSourceDao().allEnabled
+            bookSourceList.clear()
+            if (searchGroup.isBlank()) {
+                bookSourceList.addAll(App.db.bookSourceDao().allEnabled)
             } else {
-                App.db.bookSourceDao().getEnabledByGroup(searchGroup)
+                bookSourceList.addAll(App.db.bookSourceDao().getEnabledByGroup(searchGroup))
             }
-            for (item in bookSourceList) {
-                //task取消时自动取消 by （scope = this@execute）
-                WebBook(item).searchBook(
-                        searchKey,
-                        searchPage,
-                        scope = this,
-                        context = searchPool
-                    )
-                    .timeout(30000L)
-                    .onSuccess(IO) {
-                        if (searchId == mSearchId) {
-                            callBack.onSearchSuccess(it)
-                        }
-                    }
-            }
-        }.onStart {
-            callBack.onSearchStart()
+        } else {
+            searchPage++
+        }
+        for (i in 0 until threadCount) {
+            search(searchId)
         }
+    }
 
-        task?.invokeOnCompletion {
-            if (searchId == mSearchId) {
-                callBack.onSearchFinish()
+    private fun search(searchId: Long) {
+        synchronized(this) {
+            if (searchIndex >= bookSourceList.lastIndex) {
+                return
             }
+            searchIndex++
+            val source = bookSourceList[searchIndex]
+            val task = WebBook(source).searchBook(
+                searchKey,
+                searchPage,
+                scope = scope,
+                context = searchPool!!
+            ).timeout(30000L)
+                .onSuccess(IO) {
+                    if (searchId == mSearchId) {
+                        callBack.onSearchSuccess(it)
+                    }
+                }
+                .onFinally {
+                    synchronized(this) {
+                        if (searchIndex < bookSourceList.lastIndex) {
+                            search(searchId)
+                        } else {
+                            searchIndex++
+                        }
+                        if (searchIndex >= bookSourceList.lastIndex + min(bookSourceList.size,
+                                threadCount)
+                        ) {
+                            callBack.onSearchFinish()
+                        }
+                    }
+                }
+            tasks.add(task)
         }
     }
 
     fun cancelSearch() {
-        task?.cancel()
-        mSearchId = 0
+        close()
         callBack.onSearchCancel()
     }
 
     fun close() {
-        task?.cancel()
-        mSearchId = 0
-        searchPool.close()
+        tasks.clear()
+        searchPool?.close()
+        mSearchId = 0L
     }
 
     interface CallBack {
diff --git a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
index 4b50151ef..8efb57093 100644
--- a/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/changesource/ChangeSourceViewModel.kt
@@ -22,10 +22,11 @@ import kotlinx.coroutines.asCoroutineDispatcher
 import org.jetbrains.anko.debug
 import java.util.concurrent.CopyOnWriteArraySet
 import java.util.concurrent.Executors
+import kotlin.math.min
 
 class ChangeSourceViewModel(application: Application) : BaseViewModel(application) {
     val threadCount = AppConfig.threadCount
-    private lateinit var searchPool: ExecutorCoroutineDispatcher
+    private var searchPool: ExecutorCoroutineDispatcher? = null
     val handler = Handler()
     val searchStateData = MutableLiveData<Boolean>()
     val searchBooksLiveData = MutableLiveData<List<SearchBook>>()
@@ -106,9 +107,12 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
 
     private fun search() {
         synchronized(this) {
+            if (searchIndex >= bookSourceList.lastIndex) {
+                return
+            }
             searchIndex++
             val source = bookSourceList[searchIndex]
-            val task = WebBook(source).searchBook(name, scope = this, context = searchPool)
+            val task = WebBook(source).searchBook(name, scope = this, context = searchPool!!)
                 .timeout(60000L)
                 .onSuccess(IO) {
                     it.forEach { searchBook ->
@@ -133,7 +137,9 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
                         } else {
                             searchIndex++
                         }
-                        if (searchIndex >= bookSourceList.lastIndex + threadCount) {
+                        if (searchIndex >= bookSourceList.lastIndex + min(bookSourceList.size,
+                                threadCount)
+                        ) {
                             searchStateData.postValue(false)
                         }
                     }
@@ -194,14 +200,14 @@ class ChangeSourceViewModel(application: Application) : BaseViewModel(applicatio
             startSearch()
         } else {
             tasks.clear()
-            searchPool.close()
+            searchPool?.close()
             searchStateData.postValue(false)
         }
     }
 
     override fun onCleared() {
         super.onCleared()
-        searchPool.close()
+        searchPool?.close()
     }
 
     fun disableSource(searchBook: SearchBook) {
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
index e06c6f81a..564b2bb3e 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchViewModel.kt
@@ -30,7 +30,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application),
      * 开始搜索
      */
     fun search(key: String) {
-        if (searchKey != key && key.isNotEmpty()) {
+        if ((searchKey != key && key.isEmpty()) || key.isNotEmpty()) {
             searchBookModel.cancelSearch()
             searchBooks.clear()
             searchBookLiveData.postValue(searchBooks)
@@ -54,6 +54,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application),
 
     override fun onSearchStart() {
         isSearchLiveData.postValue(true)
+        isLoading = true
     }
 
     override fun onSearchSuccess(searchBooks: ArrayList<SearchBook>) {