In order to improve the robustness of attitude control system to disturbance moment for exo-atmospheric interceptor,the on-off attitude control law is designed based on predictive control.The constraints on field of view and angular velocity are taken as output constraints to be added to the optimization problem of predictive control,thus the deviation of target from field of view is avoided.For the linearized attitude control model,the robustness of algorithm is guaranteed by applying the method of constraint tightening.Based on this,the optimization problem corresponding to attitude control with on-off inputs is obtained.Simulation results show that the proposed method meets accuracy requirements even if large disturbance moment exists.