The performance of the controller is the key to ensure the stability and controllability of the missile in guided flight. Without considering the coupling between the channels, we established a three-channel missile mathematical model for BTT missile based on Bank-To-Turn (BBT) control technology. The sliding mode variable structure controller was designed, and the closed-loop control system was constructed for BTT missile. Comparative study was made with PD control and the situation without the controller. The simulation results show that: the control effect of sliding mode variable structure is the best, which can quickly track the guidance command, and has good dynamic and steady-state performance.