diff --git a/board/TencentOS_tiny_EVB_LX/BSP/LoRaWAN/lora_demo.c b/board/TencentOS_tiny_EVB_LX/BSP/LoRaWAN/lora_demo.c
index 158d6e50..cf677da6 100644
--- a/board/TencentOS_tiny_EVB_LX/BSP/LoRaWAN/lora_demo.c
+++ b/board/TencentOS_tiny_EVB_LX/BSP/LoRaWAN/lora_demo.c
@@ -95,7 +95,8 @@ uint8_t pool[DATA_CNT];
 void application_entry(void *arg)
 {
     int i = 0;
-
+    int ret = 0;
+    int send_failed_count = 0;
     rhf76_lora_init(HAL_UART_PORT_1);
     tos_lora_module_recvcb_register(recv_callback);
 
@@ -113,7 +114,20 @@ void application_entry(void *arg)
         }
         printf("\n\n");
 
-        tos_lora_module_send(&dev_data.data, mail_size);
+        ret = tos_lora_module_send(&dev_data.data, mail_size);
+        if (ret < 0 )
+        {
+            printf("LoRa Send data faild! count is %d\r\n",send_failed_count);
+            send_failed_count++;
+            if (send_failed_count > 10)
+            {
+                eclic_system_reset();// when lora send faied more than 10 times , cpu reset to reconnect.
+            }
+        }
+        else
+        {
+            send_failed_count = 0;
+        }
     }
 }
 
diff --git a/board/TencentOS_tiny_EVB_MX_Plus/BSP/LoRaWAN/lora_demo.c b/board/TencentOS_tiny_EVB_MX_Plus/BSP/LoRaWAN/lora_demo.c
index 77998e71..d88f2fce 100644
--- a/board/TencentOS_tiny_EVB_MX_Plus/BSP/LoRaWAN/lora_demo.c
+++ b/board/TencentOS_tiny_EVB_MX_Plus/BSP/LoRaWAN/lora_demo.c
@@ -95,7 +95,8 @@ uint8_t pool[DATA_CNT];
 void application_entry(void *arg)
 {
     int i = 0;
-
+    int ret = 0;
+    int send_failed_count = 0;
     rhf76_lora_init(HAL_UART_PORT_0);
     tos_lora_module_recvcb_register(recv_callback);
 
@@ -113,7 +114,20 @@ void application_entry(void *arg)
         }
         printf("\n\n");
 
-        tos_lora_module_send(&dev_data.data, mail_size);
+        ret = tos_lora_module_send(&dev_data.data, mail_size);
+        if (ret < 0 )
+        {
+            printf("LoRa Send data faild!, count is %d\r\n",send_failed_count);
+            send_failed_count++;
+            if (send_failed_count > 10)
+            {
+                NVIC_SystemReset();// when lora send faied more than 10 times , cpu reset to reconnect.
+            }
+        }
+        else
+        {
+            send_failed_count = 0;
+        }
     }
 }
 
diff --git a/devices/rhf76_lora/RHF76.c b/devices/rhf76_lora/RHF76.c
index 567d8cb8..85eef1e7 100644
--- a/devices/rhf76_lora/RHF76.c
+++ b/devices/rhf76_lora/RHF76.c
@@ -526,12 +526,12 @@ static int rhf76_send(const void *buf, size_t len)
     snprintf(cmd, sizeof(cmd), RHF76_ATCMD_FMT_SEND_CMSGHEX, str_buf);
     cmd[sizeof(cmd) - 1] = '\0';
     tos_mmheap_free(str_buf);
-    tos_at_echo_create(&echo, NULL, 0, "+CMSG: ACK Received");
+    tos_at_echo_create(&echo, NULL, 0, "+CMSGHEX: ACK Received");
     tos_at_cmd_exec(&echo, 6000, cmd);
     if (echo.status == AT_ECHO_STATUS_OK || echo.status == AT_ECHO_STATUS_EXPECT) {
-        return -1;
+        return len;
     }
-    return len;
+    return -1;
 }
 
 static int rhf76_send_unconfirmed(const void *buf, size_t len)
@@ -552,9 +552,9 @@ static int rhf76_send_unconfirmed(const void *buf, size_t len)
     tos_at_echo_create(&echo, NULL, 0, "+MSGHEX: Done");
     tos_at_cmd_exec(&echo, 6000, cmd);
     if (echo.status == AT_ECHO_STATUS_OK || echo.status == AT_ECHO_STATUS_EXPECT) {
-        return -1;
+        return len;
     }
-    return len;
+    return -1;
 }
 
 static int rhf76_close(void)