Abstract: Ecolifter is taken as a reference model and a mathematical model of the flight vehicle motion based on Matlab is established. By means of the Matlab method, the flight vehicle's motion equations, flight dynamic stability, transfer functions and transient procedure responses are studied. The effects of flight vehicle design parameters on the flight dynamic characteristics are studied at the same time. Compared with the traditional method, the process followed is easy to use and more convenient in analyzing the flight dynamic characteristics of a flight vehicle. Integrated design is utilized to a large extent.