The aim of this study was to compare the Kinematics of Round kick movement among three weight divisions in Taekwondo players. The velocity monitor system, which was designed, was used with other science equipments to collect reaction time, movement velocity, and terminal velocity of Round kick movement. The statistics were one-way ANOVA and LSD analysis. Findings were as follows. First, light weight players had faster reaction time and movement velocity than medium weight players and heavy weight players significantly (p＜.050). Second, medium weight players had faster reaction time than heavy weight players significantly. Third, terminal velocity showed no significant difference among three weight divisions. The result was clearly shown that kinematics of Round kick movement were difference among different weight division players. These information were not only usefully to evaluate players' ability of Round kick movement, but also a reference resource for planning tactic in Taekwondo competition.