Abstract: As an aerodynamic package that can significantly enhance the downforce, the rear wing is a key focus in aerodynamic development of high-performance sports cars. For the aerodynamic design of the rear wing of an electric sports car, in addition to increasing the downforce, it is also important to consider the aerodynamic drag loss generated and thus the aerodynamic efficiency. The aerodynamic performance of a rear wing on the vehicle is influenced by interaction of the wing element, support structures and airflow over the back of the vehicle. Focusing on the rear wing of an electric sports car, the aerodynamic design was studied based on CFD simulations, including the airfoil selection, angles of attack matching, aerodynamic twist optimization, and support structure design, to achieve sufficient downforce with a relatively low drag increase. The flow fields were carefully analyzed to understand the underlying flow mechanisms. Additionally, wind tunnel tests were conducted to investigate the time-averaged and dynamic characteristics of aerodynamic loads on the rear wing, which can provide a reference for its engineering applications.