The table tennis technique that lateral twist with backhand in an table making use of the "S" type to swing the racket in advance and "し" type of swinging track contributes to raising the instantaneous speed of racket hitting the ball and making plenty of rotation.This paper carries on deep analysis and study to this technique that lateral twist with backhand in the table in terms of mechanics,probes into feasibility and rationality of this technique,and has important realistic meaning in further understanding and improving this technique.