The Controller Area Network bus is a serial communication protocol bus for real-time applications and one of the most widely used field buses in the world. The CAN protocol is used for communication between various components in the car to replace the expensive and bulky distribution wiring harness. The CAN bus itself has a strong anti-interference and error correction retransmission mechanism. When CAN is applied to new energy vehicles, it means that it has to work in a severe electromagnetic environment, so how to resist interference is the topic that engineers are most concerned about.