Aim at the interference sources and coupling routes of pressure sensor in locomotive, an EMC design method waspresented, which not only improved the transducer electromagnetic compatibility, but also enhanced the insulation level. Electromagneticcompatibility test according to TB/T 3221 was carried out, the results of which met the requirements of global error for pressuretransducer, and it was shown that the design method was efficient and right. The method could also be used to other locomotive electronicdevices for improving EMC performance.