The thermal stage separation being provided with improving and enhancing stability and orbit precision for flight was abroad adopted in solid-propellant ballistic missile.

As an example, maximum trajectory optimization was applied on a two-stage ballistic missile, and a comparison of original and optimal trajectories was presented with figures and tables.

A mathematical model is established solely according to two kinds of warhead fuze modes considering that atmosphere parameter error works on the flight of warhead explosion spot of ballistic missile.