Presents a basic idea of extending ultrasonic distance measurement with CAN bus and introduces a kind of CAN bus-based intelligent ultrasonic distance measurement vehicular system, in which AT89C52 is utilized as microcontroller, SJA1000 as the bus controller and 82C250 as the CAN transceiver. The proposed ultrasonic distance measurement system excels ordinary ones in simplifying the work of the system's cybernetics core and the hardware design. It may well save hardware design since it can apply the available resources in the car. Besides, the extension of CAN bus can make the further development of follow-up distance measurement system more flexible.