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With the continuous development of social economy, the number of vehicle ownership is increasing year by year, the wireless transmission of vehicle data and its head up display technology, as an effective vehicle assisted driving technology, can not only transmit the vehicle data wirelessly to the client, but also enable the driver to obtain the real-time operation data and state of the vehicle within the range of the head up, which improves the safety of driving and improves the human-computer interaction experience of the cockpit. According to the research of wireless transmission of vehicle data and its head-up display technology at home and abroad, a set of design principles of vehicle head-up display conforming to the human-computer interaction design method is proposed and the interface prototype is designed. Based on the OBD-II, Arduino Mega2560 R3 development board, USART HMI serial screen and ESP8266-01 module, the wireless transmission of vehicle data and its head up display are realized. Finally, through the OBD-II Simulator simulation test and real vehicle test, the function correctness of the system and the reliability and practicability in performance are verified.