On the basis of Davenport wind speed spectrum and using M.Shinozuka method, samples of wind load were numerically simulated on the different girds of rocket core and booster under three basic wind velocities. Then a transient response analysis was made to the rocket and its launching platform by invoking the MSC.Nastran, and the displacement response of the rocket and its launching platform under different basic wind velocities was obtained. The value of the displacement increases along with the increase of height away from the ground, and the ratio of the maximal displacement approximates to the ratio of the square of basic wind velocity on a grid. Finally, a designed load-relieving structure was placed on the umbilical cord tower. Results indicate that the maximal displacement on different grids decreases conspicuously and the anti-wind capability of the rocket and its launching platform are enhanced by a large margin with the help of the load-relieving structure. The designed structure can make a reference to the engineering practice.