diff --git a/README.md b/README.md
index 1eb071b..a81bae0 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,11 @@ aliyun-mns是对阿里云消息服务的封装，具有以下特点：
 
 * 动态创建队列
 * 可以设置消费者数目
-* 长轮询
 * 消息处理时长自适应
-* 发送消息重试
+* 发送消息重试。目前基于网络错误、阿里云MNS错误码表InternalError重试
 * 监控报警
 * 优雅的关闭消费者
+* 处理函数处理最大时间限制
 
 # 消费者
 
diff --git a/base64.go b/base64.go
index 6b633f0..0ec171c 100644
--- a/base64.go
+++ b/base64.go
@@ -6,6 +6,7 @@ const (
 	base64Regex = `^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$`
 )
 
+// IsBase54 返回字符串是否是base64编码
 func IsBase54(s string) bool {
 	rp, _ := regexp.Compile(base64Regex)
 	return rp.MatchString(s)
diff --git a/consumer.go b/consumer.go
index 1f204dd..4c3f665 100644
--- a/consumer.go
+++ b/consumer.go
@@ -2,6 +2,7 @@ package alimns
 
 import (
 	"encoding/base64"
+	"math/rand"
 	"os"
 	"os/signal"
 	"runtime"
@@ -161,6 +162,10 @@ func (c *Consumer) CreateQueueList(fetchQueueReady chan struct{}) chan struct{}
 	return createQueueReady
 }
 
+func randInRange(min, max int) int {
+	return rand.Intn(max-min) + min
+}
+
 // Schedule 使消息队列开始运作起来
 func (c *Consumer) Schedule(createQueueReady chan struct{}) {
 	go func() {
@@ -168,6 +173,8 @@ func (c *Consumer) Schedule(createQueueReady chan struct{}) {
 			select {
 			case <-createQueueReady:
 				for _, queue := range c.queues {
+					time.Sleep(time.Duration(randInRange(20, 51)) * time.Millisecond)
+
 					if c.isClosed {
 						continue
 					}
@@ -366,7 +373,7 @@ func (c *Consumer) OnReceive(queue *Queue, receiveMsg *ReceiveMessage) {
 				}
 			}
 		}
-	case <-time.After(5 * time.Hour):
+	case <-time.After(10 * time.Hour):
 		{
 			close(tickerStop)
 		}
diff --git a/error.go b/error.go
index 8630875..5f501c7 100644
--- a/error.go
+++ b/error.go
@@ -72,6 +72,11 @@ func IsHandleCrash(err error) bool {
 	return err == handleCrashError
 }
 
+// IsInternalError 是否内部错误
+func IsInternalError(err error) bool {
+	return err == internalError
+}
+
 // RespErr 阿里云回复错误
 type RespErr struct {
 	XMLName   xml.Name `xml:"Error"`
diff --git a/send_message.go b/send_message.go
index befb099..a947796 100644
--- a/send_message.go
+++ b/send_message.go
@@ -32,6 +32,9 @@ func (c *Client) SendBase64EncodedJSONMessage(name string, messageBody interface
 			case shouldRetry(err):
 				time.Sleep(time.Millisecond * 100)
 				continue
+			case IsInternalError(err):
+				time.Sleep(time.Millisecond * 100)
+				continue
 			default:
 				close(ended)
 				return
@@ -129,6 +132,8 @@ func (c *Client) sendMessage(name, messageBody string, setters ...MessageSetter)
 		switch respErr.Code {
 		case queueNotExistError.Error():
 			return nil, queueNotExistError
+		case internalError.Error():
+			return nil, internalError
 		}
 		return nil, errors.New(respErr.Message)
 	}