diff --git a/base_device.go b/base_device.go
index 053d44e..671bba1 100644
--- a/base_device.go
+++ b/base_device.go
@@ -380,7 +380,7 @@ func (device *baseIotDevice) subscribeDefaultTopics() {
 		panic(0)
 	}
 
-	// 订阅平台下发的文件上传和下载URL topic
+	// 订阅平台下发到设备的事件
 	topic = FormatTopic(PlatformEventToDeviceTopic, device.Id)
 	if token := device.Client.Subscribe(topic, device.qos, device.handlePlatformToDeviceData());
 		token.Wait() && token.Error() != nil {
@@ -448,6 +448,7 @@ func (device *baseIotDevice) handlePlatformToDeviceData() func(client mqtt.Clien
 
 			case "log_config":
 				// 平台下发日志收集通知
+				fmt.Println("platform send log collect command")
 				logConfig := &LogCollectionConfig{}
 				if json.Unmarshal([]byte(Interface2JsonString(entry.Paras)), logConfig) != nil {
 					continue
diff --git a/samples/log/log_samples.go b/samples/log/log_samples.go
index 6ec8daf..ade4b6c 100644
--- a/samples/log/log_samples.go
+++ b/samples/log/log_samples.go
@@ -1,14 +1,40 @@
 package main
 
 import (
+	"fmt"
 	iot "github.com/ctlove0523/huaweicloud-iot-device-sdk-go"
 	"github.com/ctlove0523/huaweicloud-iot-device-sdk-go/samples"
+	"strconv"
+	"time"
 )
 
 func main() {
 	device := samples.CreateDevice()
+	device.AddMessageHandler(func(message iot.Message) bool {
+		fmt.Println(message)
+		return true
+	})
+	device.SetSubDevicesAddHandler(func(devices iot.SubDeviceInfo) {
+		fmt.Println(device)
+	})
+	device.SetSubDevicesDeleteHandler(func(devices iot.SubDeviceInfo) {
+		fmt.Println(device)
+	})
 	device.SetDeviceStatusLogCollector(func(endTime string) []iot.DeviceLogEntry {
-		return []iot.DeviceLogEntry{}
+		fmt.Println("begin to collect log")
+		entries := []iot.DeviceLogEntry{}
+
+		for i := 0; i < 10; i++ {
+			entry := iot.DeviceLogEntry{
+				Type:      "DEVICE_MESSAGE",
+				Timestamp: iot.GetEventTimeStamp(),
+				Content:   "message hello " + strconv.Itoa(i),
+			}
+			entries = append(entries, entry)
+		}
+		return entries
 	})
 	device.Init()
+
+	time.Sleep(1 * time.Minute)
 }