Abstract: Rear wing is an important device to improve the driving stability of high-speed vehicles.In this paper, the three-dimensional model of MIRA is established by CATIA software, and its external flow field is numerically simulated.The empennage is designed by Profili software, and the external flow field of high-speed car with empennage is numerically simulated.The influence of the wing profile and angle of attack of empennage on the aerodynamic lift of high-speed car is analyzed.The results show that the lift coefficient decreases gradually with the increasing of the bending degree of wing profile, and the aerodynamic lift coefficient of the whole car is the largest when the wing profile of empennage is S1223.With the increase of angle of attack, the drag coefficient of automobile gradually increases, while the lift coefficient gradually decreases.