A method for automatic solution of flight behaviors of elastic sounding rocket at the atmospheric disturbances and for judgement of its architectural designs is described in this paper. The main feature of this method is synthetic computation and analysis of the elastic body in combination with the f1ight enviroment，As long as the parameters of the rigid rocket body at launching moment is inputted，the program can be used to continuously print out a larg amount of information of the elastic body，including attitude of flight，flexibility of body，top altitude of flight，trajectory parameteres and aerodynamic fores et al，according to which it is possible to define the best design and to improve on it.