diff --git a/app/src/main/java/io/legado/app/base/BaseViewModel.kt b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
index 1aa8452c9..d59bb15f7 100644
--- a/app/src/main/java/io/legado/app/base/BaseViewModel.kt
+++ b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
@@ -8,17 +8,26 @@ import io.legado.app.help.coroutine.Coroutine
 import kotlinx.coroutines.*
 import org.jetbrains.anko.AnkoLogger
 import org.jetbrains.anko.toast
+import kotlin.coroutines.CoroutineContext
 
-open class BaseViewModel(application: Application) : AndroidViewModel(application), CoroutineScope by MainScope(),
+open class BaseViewModel(application: Application) : AndroidViewModel(application),
+    CoroutineScope by MainScope(),
     AnkoLogger {
 
     val context: Context by lazy { this.getApplication<App>() }
 
-    fun <T> execute(scope: CoroutineScope = this, block: suspend CoroutineScope.() -> T): Coroutine<T> {
+    fun <T> execute(
+        scope: CoroutineScope = this,
+        context: CoroutineContext = scope.coroutineContext.plus(Dispatchers.IO),
+        block: suspend CoroutineScope.() -> T
+    ): Coroutine<T> {
         return Coroutine.async(scope) { block() }
     }
 
-    fun <R> submit(scope: CoroutineScope = this, block: suspend CoroutineScope.() -> Deferred<R>): Coroutine<R> {
+    fun <R> submit(
+        scope: CoroutineScope = this,
+        block: suspend CoroutineScope.() -> Deferred<R>
+    ): Coroutine<R> {
         return Coroutine.async(scope) { block().await() }
     }
 
diff --git a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
index 5b8c3d2c0..e72a3df22 100644
--- a/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
+++ b/app/src/main/java/io/legado/app/help/coroutine/Coroutine.kt
@@ -1,18 +1,25 @@
 package io.legado.app.help.coroutine
 
-import android.util.Log
 import kotlinx.coroutines.*
 import kotlin.coroutines.CoroutineContext
 
 
-class Coroutine<T>(scope: CoroutineScope, block: suspend CoroutineScope.() -> T) {
+class Coroutine<T>(
+    scope: CoroutineScope,
+    context: CoroutineContext = scope.coroutineContext.plus(Dispatchers.IO),
+    block: suspend CoroutineScope.() -> T
+) {
 
     companion object {
 
         val DEFAULT = MainScope()
 
-        fun <T> async(scope: CoroutineScope = DEFAULT, block: suspend CoroutineScope.() -> T): Coroutine<T> {
-            return Coroutine(scope, block)
+        fun <T> async(
+            scope: CoroutineScope = DEFAULT,
+            context: CoroutineContext = scope.coroutineContext.plus(Dispatchers.IO),
+            block: suspend CoroutineScope.() -> T
+        ): Coroutine<T> {
+            return Coroutine(scope, context, block)
         }
 
     }
@@ -37,7 +44,7 @@ class Coroutine<T>(scope: CoroutineScope, block: suspend CoroutineScope.() -> T)
         get() = job.isCompleted
 
     init {
-        this.job = executeInternal(scope, block)
+        this.job = executeInternal(scope, context, block)
     }
 
     fun timeout(timeMillis: () -> Long): Coroutine<T> {
@@ -101,11 +108,15 @@ class Coroutine<T>(scope: CoroutineScope, block: suspend CoroutineScope.() -> T)
         return job.invokeOnCompletion(handler)
     }
 
-    private fun executeInternal(scope: CoroutineScope, block: suspend CoroutineScope.() -> T): Job {
+    private fun executeInternal(
+        scope: CoroutineScope,
+        context: CoroutineContext,
+        block: suspend CoroutineScope.() -> T
+    ): Job {
         return scope.plus(Dispatchers.Main).launch {
             try {
                 start?.let { dispatchVoidCallback(this, it) }
-                val value = executeBlock(scope, timeMillis ?: 0L, block)
+                val value = executeBlock(context, timeMillis ?: 0L, block)
                 success?.let { dispatchCallback(this, value, it) }
             } catch (e: Throwable) {
                 val consume: Boolean = errorReturn?.value?.let { value ->
@@ -147,11 +158,11 @@ class Coroutine<T>(scope: CoroutineScope, block: suspend CoroutineScope.() -> T)
     }
 
     private suspend inline fun executeBlock(
-        scope: CoroutineScope,
+        context: CoroutineContext,
         timeMillis: Long,
         noinline block: suspend CoroutineScope.() -> T
     ): T? {
-        return withContext(scope.coroutineContext.plus(Dispatchers.IO)) {
+        return withContext(context) {
             if (timeMillis > 0L) withTimeout(timeMillis) {
                 block()
             } else block()
diff --git a/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt b/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
index 1ed4fae13..bc25fa64f 100644
--- a/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/search/SearchActivity.kt
@@ -107,7 +107,10 @@ class SearchActivity : VMBaseActivity<SearchViewModel>(R.layout.activity_book_se
 
     private fun initOtherView() {
         tv_clear_history.onClick { viewModel.clearHistory() }
-        fb_stop.onClick { viewModel.stop() }
+        fb_stop.onClick {
+            viewModel.stop()
+            refresh_progress_bar.isAutoLoading = false
+        }
     }
 
     private fun initData() {
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 011a13d8a..0890ef013 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
@@ -8,9 +8,13 @@ import io.legado.app.data.entities.SearchKeyword
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.model.WebBook
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.asCoroutineDispatcher
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.delay
+import java.util.concurrent.Executors
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
+    private var searchPool = Executors.newFixedThreadPool(99).asCoroutineDispatcher()
     private var task: Coroutine<*>? = null
     var searchKey: String = ""
     var startTime: Long = 0
@@ -26,7 +30,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
         searchKey = key
         startTime = System.currentTimeMillis()
         start?.invoke()
-        task = execute {
+        task = execute(context = searchPool) {
             //onCleared时自动取消
             val bookSourceList = App.db.bookSourceDao().allEnabled
             for (item in bookSourceList) {
@@ -53,6 +57,7 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
     }
 
     fun stop() {
+        searchPool.cancel()
         task?.cancel()
     }
 
@@ -77,4 +82,9 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
             App.db.searchKeywordDao().deleteAll()
         }
     }
+
+    override fun onCleared() {
+        searchPool.close()
+        super.onCleared()
+    }
 }