By means of high-speed photography and film analysis, the mechanism produced by the changes of the velocity of the center of body mass at the supporting phase of running at full speed after start in sprinting, its dynamics and technique were discussed to provide reference for further studying and perfecting the theory of sprint as well as guiding teaching and training.

Influence of back step running to running technology of modern sprint;

The comparative study on where the running power of sprint comes from;

The biomechanical analysis on technique of emptying in 100 meters running;

The classical analysis in biomechanics that is the mid-way running motion of houdeng or qiudeng style sprint technology during the supporting period is the analysis in biomechanics to cushion first then to extend.

By high - speed photography and film analysis, the authors make a comparative analysis on the buffering technique of the Chinese elite 100 m runners supporting leg during the intermediate running.