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 dcd19b586..f21cbdf06 100644
--- a/app/src/main/java/io/legado/app/base/BaseViewModel.kt
+++ b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
@@ -13,11 +13,11 @@ open class BaseViewModel(application: Application) : AndroidViewModel(applicatio
     AnkoLogger {
 
     fun <T> execute(block: suspend CoroutineScope.() -> T): Coroutine<T> {
-        return Coroutine.launch(this) { block() }
+        return Coroutine.async(this) { block() }
     }
 
     fun <T> submit(block: suspend CoroutineScope.() -> Deferred<T>): Coroutine<T> {
-        return Coroutine.launch(this) { block().await() }
+        return Coroutine.async(this) { block().await() }
     }
 
     fun <T> plus(coroutine: Coroutine<T>): Coroutine<T> {
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 6a471cdb7..686d6b9fc 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
@@ -2,35 +2,38 @@ package io.legado.app.help.coroutine
 
 import kotlinx.coroutines.*
 
-class Coroutine<T>(private val scope: CoroutineScope, private val block: suspend CoroutineScope.() -> T) {
+class Coroutine<T>() {
 
     companion object {
 
         private val DEFAULT = MainScope()
 
-        fun <T> launch(scope: CoroutineScope = DEFAULT, block: suspend CoroutineScope.() -> T): Coroutine<T> {
+        fun <T> async(scope: CoroutineScope = DEFAULT, block: suspend CoroutineScope.() -> T): Coroutine<T> {
             return Coroutine(scope, block)
         }
 
-        fun <T> plus(coroutine: Coroutine<T>): Coroutine<T>{
-            return Coroutine(coroutine.scope, coroutine.block)
-                .timeout{ coroutine.timeMillis?:0 }
-                .onErrorReturn { coroutine.errorReturn?.value }
-                .onStart { coroutine.start }
-                .onSuccess { coroutine.success }
-                .onError { coroutine.error }
-                .onFinally { coroutine.finally }
+        fun <T> plus(coroutine: Coroutine<T>): Coroutine<T> {
+            return Coroutine(coroutine)
         }
     }
 
-    private val job: Job
-    
-    init {
-        job = scope.launch {
-            executeInternal(block)
+    private var coroutine: Coroutine<T>? = null
+    private var job: Job? = null
+
+    private constructor(
+        scope: CoroutineScope? = null,
+        block: (suspend CoroutineScope.() -> T)? = null
+    ) : this() {
+        this.job = scope?.launch {
+            block?.let { executeInternal(it) }
         }
     }
 
+    private constructor(coroutine: Coroutine<T>) : this() {
+        this.coroutine = coroutine
+        this.job = coroutine.job
+    }
+
     private var start: (() -> Unit)? = null
     private var success: ((T?) -> Unit)? = null
     private var error: ((Throwable) -> Unit)? = null
@@ -42,38 +45,62 @@ class Coroutine<T>(private val scope: CoroutineScope, private val block: suspend
 
 
     fun timeout(timeMillis: () -> Long): Coroutine<T> {
-        this.timeMillis = timeMillis()
+        if (this.coroutine != null) {
+            this.coroutine!!.timeMillis = timeMillis()
+        } else {
+            this.timeMillis = timeMillis()
+        }
         return this@Coroutine
     }
 
     fun onErrorReturn(value: () -> T?): Coroutine<T> {
-        errorReturn = Result(value())
+        if (this.coroutine != null) {
+            this.coroutine!!.errorReturn = Result(value())
+        } else {
+            errorReturn = Result(value())
+        }
         return this@Coroutine
     }
 
     fun onStart(start: (() -> Unit)): Coroutine<T> {
-        this.start = start
+        if (this.coroutine != null) {
+            this.coroutine!!.start = start
+        } else {
+            this.start = start
+        }
         return this@Coroutine
     }
 
     fun onSuccess(success: (T?) -> Unit): Coroutine<T> {
-        this.success = success
+        if (this.coroutine != null) {
+            this.coroutine!!.success = success
+        } else {
+            this.success = success
+        }
         return this@Coroutine
     }
 
     fun onError(error: (Throwable) -> Unit): Coroutine<T> {
-        this.error = error
+        if (this.coroutine != null) {
+            this.coroutine!!.error = error
+        } else {
+            this.error = error
+        }
         return this@Coroutine
     }
 
     fun onFinally(finally: () -> Unit): Coroutine<T> {
-        this.finally = finally
+        if (this.coroutine != null) {
+            this.coroutine!!.finally = finally
+        } else {
+            this.finally = finally
+        }
         return this@Coroutine
     }
 
     //取消当前任务
     fun cancel(cause: CancellationException? = null) {
-        job.cancel(cause)
+        job?.cancel(cause)
     }
 
     private suspend fun executeInternal(block: suspend CoroutineScope.() -> T) {
diff --git a/app/src/main/java/io/legado/app/model/WebBook.kt b/app/src/main/java/io/legado/app/model/WebBook.kt
index 7fb067215..675e0c8d2 100644
--- a/app/src/main/java/io/legado/app/model/WebBook.kt
+++ b/app/src/main/java/io/legado/app/model/WebBook.kt
@@ -12,7 +12,7 @@ import io.legado.app.model.webbook.BookList
 class WebBook(private val bookSource: BookSource) {
 
     fun searchBook(key: String, page: Int?): Coroutine<List<SearchBook>> {
-        return Coroutine.launch {
+        return Coroutine.async {
             bookSource.getSearchRule().searchUrl?.let { searchUrl ->
                 val analyzeUrl = AnalyzeUrl(searchUrl)
                 val response = when {
@@ -29,9 +29,9 @@ class WebBook(private val bookSource: BookSource) {
                     else -> HttpHelper.getApiService<IHttpGetApi>(analyzeUrl.baseUrl)
                         .getMap(analyzeUrl.url, analyzeUrl.fieldMap, analyzeUrl.headerMap).await()
                 }
-                return@launch BookList.analyzeBookList(response, bookSource, analyzeUrl)
+                return@async BookList.analyzeBookList(response, bookSource, analyzeUrl)
             }
-            return@launch arrayListOf<SearchBook>()
+            return@async arrayListOf<SearchBook>()
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
index 2674ce70e..5c7465884 100644
--- a/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/search/SearchViewModel.kt
@@ -12,26 +12,23 @@ import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.help.http.HttpHelper
 import io.legado.app.model.WebBook
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 class SearchViewModel(application: Application) : BaseViewModel(application) {
 
     val searchBooks: LiveData<List<SearchBook>> = MutableLiveData()
 
     fun search(start: (() -> Unit)? = null, finally: (() -> Unit)? = null) {
-        execute {
+        val c = execute {
             val response: String = HttpHelper.getApiService<CommonHttpApi>(
                 "http://www.baidu.com"
             ).get("http://www.baidu.com").await()
 
-            delay(4000L)
-
-            Log.e("TAG1", Thread.currentThread().name)
+            delay(2000L)
 
             response
 
         }
-            .timeout { 100L }
-            .onErrorReturn { "error return" }
             .onStart {
                 Log.e("TAG!", "start")
                 start?.let { it() }
@@ -49,7 +46,32 @@ class SearchViewModel(application: Application) : BaseViewModel(application) {
                 }
             }
 
-        plus(WebBook(BookSource()).searchBook("keyword", 1))
+        val c2 = plus(c)
+//            .timeout { 100L }
+//            .onErrorReturn { "error return2" }
+            .onStart {
+                Log.e("TAG!", "start2")
+                start?.let { it() }
+            }
+            .onSuccess {
+                Log.e("TAG!", "success2: $it")
+            }
+            .onError {
+                Log.e("TAG!", "error2: $it")
+            }
+            .onFinally {
+                Log.e("TAG!", "finally2")
+                if (finally != null) {
+                    finally()
+                }
+            }
+
+        launch {
+
+           delay(1500L)
+            c2.cancel()
+
+        }
     }
 
 }