Because perpendicular impact on the target was required for reentry maneuvering warhead, the integrated guidance law with terminal angular constraint, which comprised diving-plane guidance equation and turning-plane guidance equation, was derived. The robustness was enhanced by adding sliding mode variable structure control to the optimal guidance law. For the sake of reduction of chattering and energy consumption, the RBF(Radius Basis Function) neural network was used to adjust adaptively switching gain, which was demonstrated to be effective through computer simulation. Simulation results still show that, compared with optimal guidance law, the integrated guidance law can still hold the guidance precision when disturbance exists.