Aiming at the problem of hypersonic vehicle control with strong coupling and severe nonlinearity, an improved adaptive second-order sliding mode control method is proposed.Firstly, uncertain factors are added to the longitudinal model of hypersonic vehicle, and a control model with parameter uncertainties, model uncertainties and interferences is established.Secondly, based on the established model, an adaptive second-order sliding mode controller based on super-twisting algorithm is designed by using quadratic Lyapunov function.Finally, the simulation results show that:Compared with the common second-order sliding mode controller, the controller designed in this method has better tracking effect and robustness for systems with unknown upper bound uncertainty.