Abstract: With the velocity getting larger when automobiles are running, the aerodynamic lift influences the steering stability and the dynamic property greatly. To study the aerodynamic lift caused by wing and its accessory, the rear wing of a sports car was taken as the research object. By using the method of compute fluid dynamics (CFD) simulation, the influence of rear wing factors on the aerodynamic lift was investigated, such as: the shape, attack angle, concave pits on the wing surface and the bracket form. The result shows that the negative aerodynamic lift caused by the rear wing has a lot to do with the shape and bracket form. With the increase of attack angle, the negative aerodynamic lift is getting larger. In addition, the concave pits on the wing surface contribute also to the negative aerodynamic lift.