This article describes the types and configurations of current electric vehicles (EV). It is noted that the most widely used configuration of EV power systems is a drive system, which integrates an electric motor, a gear box and a differential to drive two wheels. The types of electric vehicle power systems can be divided into hybrid EV (HEV), plug-in hybrid EV (PHEV) and battery EV (BEV). In comparison, the differences among them are mainly the battery capacity and the power level of the electric drive motors. Besides, since BSG (Belt-driven Starter and Generator) and ISG (Integrated Starter Generator) hybrid systems in 48 V power system do not need to make extensive design changes from existing engine systems but still enhance fuel efficiency, they are widely adopted by many major car companies. Finally, the development trend of electric power systems was investigated by reviewing the ranking of global BEV sales in 2017.