On the reasonable assumption of match AOA (Angle of attack) flight, the mathematics simulation model of the reentry flight of a spaceship is formulated in this paper.

The mathematical model of reentry maneuvering trajectory is established. The fitting expression of aerodynamic coefficient function on velocity, attack of Angle and altitude is presented.

Using numerical calculation, optimal roll program, the ratio of lift and drag, reentry Angle and reentry time of spacecraft are gotten.