diff --git a/health/checker.go b/health/checker.go
index 9b555d63b..ef34c692e 100644
--- a/health/checker.go
+++ b/health/checker.go
@@ -31,16 +31,18 @@ type checkerHandler struct {
 	Notifier
 }
 
-func NewChecker(name string, ch Checker, interval, timeout time.Duration) CheckerHandler {
-	return &checkerHandler{
+func NewChecker(name string, ch Checker, opt ...CheckOption) CheckerHandler {
+	c := &checkerHandler{
 		Name:          name,
-		intervalTime:  interval,
-		timeout:       timeout,
 		Checker:       ch,
 		CheckerStatus: CheckerStatus{},
 		RWMutex:       &sync.RWMutex{},
 		Notifier:      nil,
 	}
+	for _, v := range opt {
+		v(c)
+	}
+	return c
 }
 
 func (c *checkerHandler) setNotifier(w Notifier) {
@@ -104,3 +106,17 @@ func (c *checkerHandler) getStatus() CheckerStatus {
 	defer c.RUnlock()
 	return c.CheckerStatus
 }
+
+type CheckOption func(handler *checkerHandler)
+
+func WithInterval(interval time.Duration) CheckOption {
+	return func(handler *checkerHandler) {
+		handler.intervalTime = interval
+	}
+}
+
+func WithTimeout(timeout time.Duration) CheckOption {
+	return func(handler *checkerHandler) {
+		handler.timeout = timeout
+	}
+}
diff --git a/health/health.go b/health/health.go
index 5e389621d..7ebd15e47 100644
--- a/health/health.go
+++ b/health/health.go
@@ -100,7 +100,7 @@ func (c *CheckerMgr) NewWatcher() Watcher {
 	c.lock.Lock()
 	wID := c.watcherID
 	c.watcherID++
-	ch := make(chan string, 1)
+	ch := make(chan string, len(c.checkers))
 	c.watchers[wID] = ch
 	c.lock.Unlock()
 	return Watcher{
diff --git a/health/health_test.go b/health/health_test.go
index 7cd964b93..27e511e37 100644
--- a/health/health_test.go
+++ b/health/health_test.go
@@ -3,6 +3,7 @@ package health
 import (
 	"fmt"
 	"golang.org/x/net/context"
+	"math/rand"
 	"testing"
 	"time"
 )
@@ -12,9 +13,9 @@ type A struct {
 
 func (A) Check(ctx context.Context) (interface{}, error) {
 	fmt.Println("check A")
-	//if rand.Int()%2 == 0 {
-	//	return "出错A", fmt.Errorf("错误:%s", "123")
-	//}
+	if rand.Int()%5 == 0 {
+		return "出错A", fmt.Errorf("错误:%s", "123")
+	}
 	return "正常A", nil
 }
 
@@ -23,25 +24,25 @@ type B struct {
 
 func (B) Check(ctx context.Context) (interface{}, error) {
 	fmt.Println("check B")
-	//if rand.Int()%2 == 0 {
-	//	return "出错B", fmt.Errorf("错误:%s", "123B")
-	//}
+	if rand.Int()%5 == 0 {
+		return "出错B", fmt.Errorf("错误:%s", "123B")
+	}
 	return "正常B", nil
 }
 
 func TestNew(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.TODO())
 	cm := New(ctx)
-	cm.RegisterChecker(NewChecker("A", A{}, time.Second*0, time.Second*10))
-	cm.RegisterChecker(NewChecker("B", B{}, time.Second*0, time.Second*10))
+	cm.RegisterChecker(NewChecker("A", A{}, WithInterval(time.Second), WithInterval(time.Second)))
+	cm.RegisterChecker(NewChecker("B", B{}, WithInterval(time.Second), WithInterval(time.Second)))
 	cm.Start()
 	go func() {
+		w := cm.NewWatcher()
 		s := cm.GetStatus()
 		fmt.Println("----", s)
-		w := cm.NewWatcher()
 		defer w.Close()
 		for i := range w.Ch {
-			fmt.Println("---", cm.GetStatus(i))
+			fmt.Println("--->>", i, cm.GetStatus(i))
 		}
 	}()
 	time.Sleep(time.Second * 20)