diff --git a/g/os/grpool/grpool_api.go b/g/os/grpool/grpool_api.go
index 95beb37c6..2af65b644 100644
--- a/g/os/grpool/grpool_api.go
+++ b/g/os/grpool/grpool_api.go
@@ -21,10 +21,12 @@ const (
 
 // goroutine池对象
 type Pool struct {
+    size       int32              // 限制最大的goroutine数量/线程数/worker数量
     expire     int32              // goroutine过期时间(秒)
     number     int32              // 当前goroutine数量(非任务数)
     queue      *glist.SafeList    // 空闲任务队列(*PoolJob)
     funcs      *glist.SafeList    // 待处理任务操作队列
+    freeEvents chan struct{}      // 空闲线程通知事件
     funcEvents chan struct{}      // 任务操作处理事件(用于任务事件通知)
     stopEvents chan struct{}      // 池关闭事件(用于池相关异步线程通知)
 }
@@ -41,11 +43,18 @@ type PoolJob struct {
 var defaultPool = New(gDEFAULT_EXPIRE_TIME)
 
 // 创建goroutine池管理对象，给定过期时间(秒)
-func New(expire int) *Pool {
+// 第二个参数用于限制限制最大的goroutine数量/线程数/worker数量，非必需参数，默认不做限制
+func New(expire int, sizes...int) *Pool {
+    size := math.MaxInt32
+    if len(sizes) > 0 {
+        size = sizes[0]
+    }
     p := &Pool {
+        size       : int32(size),
         expire     : int32(expire),
         queue      : glist.NewSafeList(),
         funcs      : glist.NewSafeList(),
+        freeEvents : make(chan struct{}, math.MaxUint32),
         funcEvents : make(chan struct{}, math.MaxUint32),
         stopEvents : make(chan struct{}, 1),
     }
@@ -65,7 +74,17 @@ func Size() int {
     return int(atomic.LoadInt32(&defaultPool.number))
 }
 
-// 设置默认池中goroutine的过期时间
+// 查询当前等待处理的任务总数
+func Jobs() int {
+    return len(defaultPool.funcEvents)
+}
+
+// 动态改变默认池中goroutine的上线数量
+func SetSize(size int) {
+    atomic.StoreInt32(&defaultPool.size, int32(size))
+}
+
+// 动态改变默认池中goroutine的过期时间
 func SetExpire(expire int) {
     atomic.StoreInt32(&defaultPool.expire, int32(expire))
 }
@@ -81,7 +100,17 @@ func (p *Pool) Size() int {
     return int(atomic.LoadInt32(&p.number))
 }
 
-// 设置当前池中goroutine的过期时间
+// 查询当前等待处理的任务总数
+func (p *Pool) Jobs() int {
+    return len(p.funcEvents)
+}
+
+// 动态改变当前池中goroutine的上线数量
+func (p *Pool) SetSize(size int) {
+    atomic.StoreInt32(&p.size, int32(size))
+}
+
+// 动态改变当前池中goroutine的过期时间
 func (p *Pool) SetExpire(expire int) {
     atomic.StoreInt32(&p.expire, int32(expire))
 }
diff --git a/g/os/grpool/grpool_pool.go b/g/os/grpool/grpool_pool.go
index d7ebc6313..0bb1a5d25 100644
--- a/g/os/grpool/grpool_pool.go
+++ b/g/os/grpool/grpool_pool.go
@@ -12,7 +12,7 @@ import (
     "gitee.com/johng/gf/g/os/gtime"
 )
 
-// 任务分配循环
+// 任务分配循环，这是一个独立的goroutine，单线程处理
 func (p *Pool) startWorkLoop() {
     go func() {
         for {
@@ -26,7 +26,7 @@ func (p *Pool) startWorkLoop() {
     }()
 }
 
-// 定时清理过期任务
+// 定时清理过期任务，单线程处理
 func (p *Pool) startClearLoop() {
     go func() {
         for {
@@ -48,14 +48,20 @@ func (p *Pool) startClearLoop() {
                     }
                 }
             }
-            // 判断是池已经关闭，是则退出
-            if len(p.stopEvents) > 0 {
+            // 判断是池已经关闭，并且所有goroutine已退出，那么该goroutine终止执行
+            if len(p.stopEvents) > 0 && atomic.LoadInt32(&p.number) == 0 {
                 break
             }
         }
     }()
 }
 
+// 判断是否达到goroutine上上限
+func (p *Pool) reachSizeLimit() bool {
+    return false
+    return atomic.LoadInt32(&p.number) >= atomic.LoadInt32(&p.size)
+}
+
 // 获取过期时间
 func (p *Pool) getExpire() int32 {
     return atomic.LoadInt32(&p.expire)
@@ -63,6 +69,14 @@ func (p *Pool) getExpire() int32 {
 
 // 创建一个空的任务对象
 func (p *Pool) newJob() *PoolJob {
+    // 如果达到goroutine数限制，那么阻塞等待有空闲goroutine后继续
+    //if p.reachSizeLimit() {
+    //    // 阻塞等待空闲goroutine
+    //    select {
+    //        case <- p.freeEvents:
+    //            return p.getJob()
+    //    }
+    //}
     j := &PoolJob {
         job  : make(chan func(), 1),
         pool : p,
@@ -77,7 +91,12 @@ func (p *Pool) addJob(j *PoolJob) bool {
     if j.pool.getExpire() == -1 {
         return false
     }
-    return p.queue.PushBack(j) != nil
+    p.queue.PushBack(j)
+    // 如果当前的goroutine数量达到上线，那么需要使用空闲goroutine通知事件
+    //if p.reachSizeLimit() {
+    //    p.freeEvents <- struct{}{}
+    //}
+    return true
 }
 
 // 获取/创建任务
diff --git a/g/os/grpool/grpool_testb1_test.go b/g/os/grpool/grpool_testb1_test.go
index 16826af47..db82a0500 100644
--- a/g/os/grpool/grpool_testb1_test.go
+++ b/g/os/grpool/grpool_testb1_test.go
@@ -23,8 +23,8 @@ func BenchmarkGrpool_1(b *testing.B) {
     }
 }
 
-func BenchmarkGoroutine_1(b *testing.B) {
-    for i := 0; i < b.N; i++ {
-        go increment1()
-    }
-}
\ No newline at end of file
+//func BenchmarkGoroutine_1(b *testing.B) {
+//    for i := 0; i < b.N; i++ {
+//        go increment1()
+//    }
+//}
\ No newline at end of file
diff --git a/geg/os/groutine.go b/geg/os/groutine.go
index 0df3fcec7..ebb2120a8 100644
--- a/geg/os/groutine.go
+++ b/geg/os/groutine.go
@@ -7,19 +7,20 @@ import (
     "gitee.com/johng/gf/g/os/grpool"
 )
 
-func job(i int) {
-    time.Sleep(2*time.Second)
-    //fmt.Println("job done:", i)
+func job() {
+    time.Sleep(1*time.Second)
 }
 
 func main() {
-    for i := 0; i < 10; i++ {
+    grpool.SetSize(10)
+    for i := 0; i < 1000; i++ {
         grpool.Add(func() {
-            job(i)
+            job()
         })
     }
     gtime.SetInterval(2*time.Second, func() bool {
-        fmt.Println(grpool.Size())
+        fmt.Println("size:", grpool.Size())
+        fmt.Println("jobs:", grpool.Jobs())
         return true
     })
     time.Sleep(5000*time.Second)
diff --git a/geg/other/test.go b/geg/other/test.go
index 3f77e3182..bcb8590d7 100644
--- a/geg/other/test.go
+++ b/geg/other/test.go
@@ -1,21 +1,10 @@
 package main
 
 import (
-    "gitee.com/johng/gf/g/os/gtime"
     "fmt"
-    "gitee.com/johng/gf/g/container/glist"
-    "math"
+    "runtime"
 )
 
 func main() {
-
-    t1 := gtime.Microsecond()
-    c :=  make(chan struct{}, math.MaxInt64)
-    c <- struct{}{}
-    fmt.Println(gtime.Microsecond() - t1)
-
-    t2 := gtime.Microsecond()
-    l := glist.NewSafeList()
-    l.PushBack(func() {})
-    fmt.Println(gtime.Microsecond() - t2)
+    fmt.Println(runtime.GOMAXPROCS(0))
 }
\ No newline at end of file