With the rapid development of ICV (Intelligent Connected Vehicle) industry,data exchange between vehicle and human,vehicle and vehicle as well as between vehicle and external environment has become common,which imposes serious threat to automobile security.Security certification of vehicle PEPS (Passive Entry Passive Start) and EMS (Engine Management System) is the prerequisite to ensure the safe operation of the vehicle.However,the widely used 128 bits AES for PEPS and EMS security certification is complex in algorithm,time consuming in encryption and decryption,and occupies more MCU resources,compared with encryption algorithm SM4.Here,the SM4 algorithm is used to carry out security certification of vehicle PEPS and EMS,which can shorten the encryption and decryption time,and effectively improve the data transmission efficiency.Then,it is implemented by advance language and transplanted to domestic MCU GD32F103.The proposed approach applies encryption algorithm SM4 and provide a research basis for ICV security certification.