The trajectory correction of shoulder-launched rocket is controlled by a mix way of pulse width modulation and Ping-Pang control method selected by control parameter automatically. The results of trajectory simulation show when it flies in smooth trajectory, it uses pulse width modulation method to improve position control precision; when it flies in steep trajectory, it uses Ping-Pang control method to improve normal direction overload. This control method can meet the need of trajectory correction. It seldom effect on rocket attitude. In the future, trajectory correction effect will be better by switching the two control methods more reasonably.