CAN bus is mainly applied in the industrialcontrolfield for data communication, aimed at the phenomenon of EMI in CAN communication, this paper analyzes the main cause of itsinterference. Because of the unbalanced circuit, space electromagnetic field and the power grid, CAN bus will be interfered by radiated interference and cause commonmode noise, affecting the quality of data communication.According to the EMC standards, the paper puts forward several solutionsfrom different sides on the basis of physical shielding, circuitfiltering and hardware design.Taking the actual project as an example, the paper uses MATLAB simulation to verify the feasibility of the method from two aspects of the inhibition effect of noise voltage and the affect to normal signal communication.