Because the EMC characteristic of lowvoltage DC motor will affect the EMC characteristics of the vehicle, this paper will lead to the problem of reducing the safety of electric vehicle when the lowvoltage DC motor interference signal exceeds the upper limit, and study the electromagnetic emission characteristics of low voltage DC motor, including low voltage DC Motor impedance characteristics, radiation emission characteristics, transient conduction emission characteristics.The measures to suppress the electromagnetic interference are grounded, shielded, and so on. The paper studies the electromagnetic shielding technology in the background of the research on the electromagnetic compatibility of a new electric vehicle with the China Automotive Technology and Research Center.The test results show that the electromagnetic shielding can solve the problem that the electromagnetic radiation interference of the low voltage DC motor affects the EMC characteristics of the vehicle.