Abstract: Aiming at the aerodynamic stability of vehicles with high speed in crosswind environment, a dynamic two-way coupled method was proposed based on large eddy simulation (LES) and 5 degree of freedom model, coupling vehicle aerodynamics and vehicle dynamics. The influence of active front steering (AFS) on the crosswind stability of high-speed vehicle was considered. The robustness of the two-way coupled method was verified by adjusting the center of gravity of the vehicle. The comparison of the vehicle motion and flow characteristics was conducted with or without driver and with or without AFS control. The results show that the lateral velocity and yawing angular velocity have an important influence on the aerodynamic stability of high-speed vehicle under crosswind condition. And without the control of driver the vehicles can return to the normal path with the help of AFS, while the vehicle without AFS can't. The maximum lateral displacement of the vehicle with the driver is 1.1 m without the control of AFS, which is 0.47 m with the AFS. The results show that the AFS can help to improve the vehicle crosswind stability.