The aerodynamic parameters and unknown uncertainty of a vehicle undergo great changes during its terminal time. To fulfill the high robustness requirements of a flight control system, a climb-dive attack control law based on backstepping is designed. By introducing a first order filter in the course of design, the problem caused by differentiations of the virtual control law is solved and the complexity of control law is reduced. The tracking error is proved to converge to a small neighborhood around zero by the Lyapunov stability theorem. The three climb-dive attack schemes simulations for the vehicle with unknown uncertainty show that the control law is satisfied with climb-dive attack and has smooth trajectory and good robustness.