The purpose of this study was to investigate the kinematical analysis on the running motion of elementary school girls. The subject of this study was 12 healthy elementary school girls. A acholastic year were divided into 2 group : high group[6 grade], middle group[3 grade]. The following findings are obtained: It\'s appear that time ratio of the stance and swing in funning motion about high group was 56% vs 44% , and this result was affected to wide step and stride length. Also, it\'s appear that displacement of center of gravity anout high group was larger than middle group, and this result was effected to the horizontal velocity of center of gravity. Trunk angle was slanted to the running direction and upper arm ratation in shoulder angle was larger than middle group. And then this result was effected to the lower extremity movement. it\'s appear that time ratio of the stance and swing in running motion about middle group was 61% vs 39%, and this result wa positively effected to narrow step and stride length. Also, it\'s appear that displacement of center of gravity about middle group was less than high group, and this result was effected to the low horizontal velocity of center of gravity. Trunk angle was slanted to the funning direction and upper arm rotation in shoulder angle was less than high group. And then this result was begatively affected to the lower extremity movement.