A CAN bus-based teaching bench for electric equipments of car doors was designed,which can be used for teaching and training program of vehicle CAN bus systems.Through the bench,CAN bus electrical network of car doors was simplified,hardware circuit of CAN bus electrical wiring system was displayed vividly,and the signal and waveform of bus system can easily be detected.In the network system,the node can be easily added with node communication tested by CAN interface card,and online programming was also available.