diff --git a/mian.go b/main.go
similarity index 92%
rename from mian.go
rename to main.go
index c53ea2e..28763ed 100644
--- a/mian.go
+++ b/main.go
@@ -13,7 +13,7 @@ func main() {
 		wp.Do(func() error {
 			for j := 0; j < 5; j++ { //每次打印0-10的值
 				//fmt.Println(fmt.Sprintf("%v->\t%v", ii, j))
-				time.Sleep(1 * time.Second)
+				time.Sleep(1 * time.Microsecond)
 			}
 			return nil
 		})
@@ -22,7 +22,6 @@ func main() {
 	}
 
 	wp.Wait()
-
 	fmt.Println(wp.IsDone())
 
 	fmt.Println("down")
diff --git a/workerpool/def.go b/workerpool/def.go
index 5e87d8e..09630da 100644
--- a/workerpool/def.go
+++ b/workerpool/def.go
@@ -5,15 +5,9 @@ import (
 	"time"
 )
 
-// // CallHandler process .定义调用回调体(可修改)
-// type CallHandler func()
-
 // TaskHandler process .定义函数回调体
 type TaskHandler func() error
 
-// ServeHandler must process tls.Config.NextProto negotiated requests.
-//type ServeHandler func(c net.Conn) error
-
 // workerPool serves incoming connections via a pool of workers
 // in FILO order, i.e. the most recently stopped worker will serve the next
 // incoming connection.
@@ -21,11 +15,11 @@ type TaskHandler func() error
 // Such a scheme keeps CPU caches hot (in theory).
 type WorkerPool struct {
 	//sync.Mutex
-	maxWorkersCount int //最大的工作协程数
-	closed          int32
-	errChan         chan error    //错误chan
-	timeout         time.Duration //最大超时时间
-	wg              sync.WaitGroup
-	task            chan TaskHandler
-	start           sync.Once
+	//maxWorkersCount int //最大的工作协程数
+	//start           sync.Once
+	closed  int32
+	errChan chan error    //错误chan
+	timeout time.Duration //最大超时时间
+	wg      sync.WaitGroup
+	task    chan TaskHandler
 }
diff --git a/workerpool/workerpool.go b/workerpool/workerpool.go
index e070c96..ca1f387 100644
--- a/workerpool/workerpool.go
+++ b/workerpool/workerpool.go
@@ -15,11 +15,14 @@ func New(max int) *WorkerPool {
 		max = 1
 	}
 
-	return &WorkerPool{
-		maxWorkersCount: max,
-		task:            make(chan TaskHandler, max),
-		errChan:         make(chan error, 1),
+	p := &WorkerPool{
+		task:    make(chan TaskHandler, 2*max),
+		errChan: make(chan error, 1),
 	}
+
+	go p.loop(max)
+
+	return p
 }
 
 //SetTimeout 设置超时时间
@@ -27,22 +30,9 @@ func (p *WorkerPool) SetTimeout(timeout time.Duration) {
 	p.timeout = timeout
 }
 
-//SingleCall 单程执行(排他)
-// func (p *WorkerPool) SingleCall(fn TaskHandler) {
-// 	p.Mutex.Lock()
-// 	fn()
-// 	p.Mutex.Unlock()
-// }
-
 //Do 添加到工作池，并立即返回
 func (p *WorkerPool) Do(fn TaskHandler) {
-	p.start.Do(func() { //once
-		p.wg.Add(p.maxWorkersCount)
-		go p.loop()
-	})
-
-	if atomic.LoadInt32(&p.closed) == 1 {
-		// 已关闭
+	if p.IsClosed() { // 已关闭
 		return
 	}
 	p.task <- fn
@@ -50,27 +40,22 @@ func (p *WorkerPool) Do(fn TaskHandler) {
 
 //DoWait 添加到工作池，并等待执行完成之后再返回
 func (p *WorkerPool) DoWait(task TaskHandler) {
-	p.start.Do(func() { //once
-		p.wg.Add(p.maxWorkersCount)
-		go p.loop()
-	})
-
-	if atomic.LoadInt32(&p.closed) == 1 { // 已关闭
+	if p.IsClosed() { // 已关闭
 		return
 	}
 
 	doneChan := make(chan struct{})
 	p.task <- func() error {
-		err := task()
-		close(doneChan)
-		return err
+		defer close(doneChan)
+		return task()
 	}
 	<-doneChan
 }
 
-func (p *WorkerPool) loop() {
-	// 启动n个worker
-	for i := 0; i < p.maxWorkersCount; i++ {
+func (p *WorkerPool) loop(maxWorkersCount int) {
+	p.wg.Add(maxWorkersCount) // 最大的工作协程数
+	// 启动max个worker
+	for i := 0; i < maxWorkersCount; i++ {
 		go func() {
 			defer p.wg.Done()
 			// worker 开始干活
@@ -132,3 +117,11 @@ func (p *WorkerPool) IsDone() bool {
 
 	return len(p.task) == 0
 }
+
+//IsClosed 是否已经关闭
+func (p *WorkerPool) IsClosed() bool {
+	if atomic.LoadInt32(&p.closed) == 1 { // 已关闭
+		return true
+	}
+	return false
+}
diff --git a/workerpool/workerpool_test.go b/workerpool/workerpool_test.go
index b698768..6d47a67 100644
--- a/workerpool/workerpool_test.go
+++ b/workerpool/workerpool_test.go
@@ -52,33 +52,6 @@ func TestWorkerPoolError(t *testing.T) {
 	fmt.Println("down")
 }
 
-//测试排他执行(到单线程模式)
-// func TestWorkerPoolSingleCall(t *testing.T) {
-// 	wp := New(2)             //设置最大线程数
-// 	for i := 0; i < 4; i++ { //开启20个请求
-// 		ii := i
-// 		wp.SingleCall(func() error {
-// 			for j := 0; j < 2; j++ { //每次打印0-10的值
-// 				fmt.Println(fmt.Sprintf("%v->\t%v", ii, j))
-// 				if ii == 1 {
-// 					return errors.New("my test err")
-// 				}
-// 				time.Sleep(1 * time.Second)
-// 			}
-
-// 			return nil
-// 			//time.Sleep(1 * time.Second)
-// 			//return errors.New("my test err")
-// 		})
-// 	}
-
-// 	err := wp.Wait()
-// 	if err != nil {
-// 		fmt.Println(err)
-// 	}
-// 	fmt.Println("down")
-// }
-
 //放到工作池里面 且等待执行结果
 func TestWorkerPoolDoWait(t *testing.T) {
 	wp := New(5)              //设置最大线程数
@@ -87,9 +60,9 @@ func TestWorkerPoolDoWait(t *testing.T) {
 		wp.DoWait(func() error {
 			for j := 0; j < 5; j++ { //每次打印0-10的值
 				fmt.Println(fmt.Sprintf("%v->\t%v", ii, j))
-				if ii == 1 {
-					return errors.New("my test err")
-				}
+				// if ii == 1 {
+				// 	return errors.New("my test err")
+				// }
 				time.Sleep(1 * time.Second)
 			}