diff --git a/examples/nb-iot_demo/nb-iot_example.c b/examples/nb-iot_demo/nb-iot_example.c
index eae8b22d..616b34d4 100644
--- a/examples/nb-iot_demo/nb-iot_example.c
+++ b/examples/nb-iot_demo/nb-iot_example.c
@@ -4,9 +4,9 @@
 #include "cmsis_os.h"
 
 
-#define NB_IoT_TEST_TASK0_STK_SIZE         1024
+#define NB_IoT_TEST_TASK_STK_SIZE         1024
 void nb_iot_demo(void);
-osThreadDef(nb_iot_demo, osPriorityNormal, 1, NB_IoT_TEST_TASK0_STK_SIZE);
+osThreadDef(nb_iot_demo, osPriorityNormal, 1, NB_IoT_TEST_TASK_STK_SIZE);
 
 int socket_id=-1;
 #define RECV_LEN            1024
@@ -14,15 +14,15 @@ uint8_t recv_data[RECV_LEN];
 
 void nb_iot_demo(void)
 {
-	int recv_len = -1;
+    int recv_len = -1;
     int bc35_28_95_sal_lwm2m_init(hal_uart_port_t uart_port);
     bc35_28_95_sal_lwm2m_init(HAL_UART_PORT_0);
     socket_id = tos_sal_module_connect("49.4.85.232","5683",TOS_SAL_PROTO_UDP);
-    if(socket_id!=-1){
-        printf("connect to clound first time and need to report!\n");
+    if(socket_id !=-1){
+        printf("connect to cloud success! fd: %d\n", socket_id);	
     }
 	else{
-        printf("udp connect success! fd: %d\n", socket_id);		
+        printf("connect to cloud failed!\n");
 	}
 	while (1) {
 		tos_sal_module_send(socket_id, (const void*)"22", strlen("22"));