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The Vertical takeoff and landing aircraft is a nonlinear underactuated control system with three degrees of freedom and two control inputs. In order to solve the problem of output tracking of the serious coupling VTOL system, firstly, the VTOL dynamic model is decoupled into a minimum phase system and a nonminimum phase system. And then, the sliding mode controllers are designed respectively for the two decoupling system, meanwhile, the system's stability is proved by Lyapunov function. Finally, the simulation results show that the proposed sliding mode controller can achieve the tracking of the trajectory without steady-state error and has strong robustness. The method proposed in this paper can also provide design reference for the output tracking problem of this kind of underactuated system.