Abstract
In this study, we made a three-dimension model of human body when they did the soccer instep kick and analyzed the motion characters between senior soccer player and junior soccer player. This dynamic model of kick movement consists of 9 segments and 13 degrees of freedom of joint motions. The result showed that when they kick the ball, the energy of the body and waist transport to the thigh and then transport to the shank and as the speed of the foot increase rapidly before the impact, the energy of the waist increases to kill the influence of the foot in order to keep balance.
