In order to study the active control methods to improve the crosswind stability of high-speed vehicle, we established the eight degrees of freedom nonlinear vehicle dynamic model under crosswind, and two degrees of freedom model based on piecewise linear tire features as the reference model. We designed an Active Front Steering (AFS) controller based on flexible PID control and a Direct Yaw moment Control (DYC) controller based on LQR Optimal control. Comparative analysis of the two kinds of typical operating conditions in two different active control methods for high-speed vehicle crosswind stability control was conducted. The results show that, on driving straight crosswind conditions, DYC on performances of maneuverability, stability, ability to keep track is superior to AFS, but AFS is superior to DYC in longitudinal dynamic; on crosswind front corner condition, AFS and DYC have little difference in the performance of maneuverability, stability and ability to keep track, but AFS is significantly better than DYC.