With the development of CAN bus and embedded technology,the automobile combination switch also develops from traditional resistance or voltage signal output to the bus output And the combination switch presents the trend of electronic and intelligent development In order to save the interior space and production cost of electric vehicle,the design method of combining the shift function of electric vehicle with the combination switch is proposed The combined switch is composed of light wiper handle,cruise handle and shift handle The handle of the light wiper and the cruise handle are reed contact mechanisms,meeting the operation requirements of 12×10 4 times,and the shift handle is Hall induction non-contact structure,meeting the operation requirements of 50×10 4 times The signal of the combination switch is processed by S9S12G128F0CLF and then output to other modules through CAN bus to reduce the mismatch between the resistance and voltage output The designed combined switch has the functions of fault diagnosis,bootloader,network management,shift control,etc The experiment and test results show that the designed combined switch can realize the function of light wiper,cruise and shift signal output simultaneously,and the performance is stable and reliable The space and cost of the original shift switch are saved by integrating the shift function on the combination switch,and the problem of signal mismatch between the combination switch and other modules is effectively solved by combining the intelligent design method of the embedded system.