diff --git a/samples/sample_c/module_sample/data_transmission/test_data_transmission.c b/samples/sample_c/module_sample/data_transmission/test_data_transmission.c
index a5e7389..4d891e2 100644
--- a/samples/sample_c/module_sample/data_transmission/test_data_transmission.c
+++ b/samples/sample_c/module_sample/data_transmission/test_data_transmission.c
@@ -46,7 +46,7 @@ static T_DjiReturnCode ReceiveDataFromOnboardComputer(const uint8_t *data, uint1
 static T_DjiReturnCode ReceiveDataFromPayload(const uint8_t *data, uint16_t len);
 
 /* Private variables ---------------------------------------------------------*/
-static T_DjiTaskHandle s_userDataTransmissionThread;
+static T_DjiTaskHandle s_userDataTransmissionThread;//线程句柄
 static T_DjiAircraftInfoBaseInfo s_aircraftInfoBaseInfo;
 
 /* Exported functions definition ---------------------------------------------*/
@@ -72,6 +72,7 @@ T_DjiReturnCode DjiTest_DataTransmissionStartService(void)
         return DJI_ERROR_SYSTEM_MODULE_CODE_SYSTEM_ERROR;
     }
 
+    //函数ReceiveDataFromMobile能够获取用户在DJI Pilot "文本输入框控件" 中向负载设备发送的信息（编码格式为UTF-8）。
     channelAddress = DJI_CHANNEL_ADDRESS_MASTER_RC_APP;
     djiStat = DjiLowSpeedDataChannel_RegRecvDataCallback(channelAddress, ReceiveDataFromMobile);
     if (djiStat != DJI_ERROR_SYSTEM_MODULE_CODE_SUCCESS) {
@@ -113,6 +114,7 @@ T_DjiReturnCode DjiTest_DataTransmissionStartService(void)
         return DJI_ERROR_SYSTEM_MODULE_CODE_NONSUPPORT;
     }
 
+    //调用osal层中注册的创建任务的函数来  创建一个任务(在新线程中运行)
     if (osalHandler->TaskCreate("user_transmission_task", UserDataTransmission_Task,
                                 DATA_TRANSMISSION_TASK_STACK_SIZE, NULL, &s_userDataTransmissionThread) !=
         DJI_ERROR_SYSTEM_MODULE_CODE_SUCCESS) {