A silicon carbide (SiC) controller for high-power-density requirement of electric vehicles is developed. The overall principle diagram of electrical design is described. The structure, hardware and software schemes of the SiC controller are analyzed in detail. A design scheme of SiC controller based on the SiC MOSFET module is proposed. The thermal simulation of the SiC controller is carried out to study its heat dissipation effect. Finally, the bench test of the SiC controller prototype is carried out. The test results show that the SiC controller has good control performances.