Purpose: The purpose of this research was to analyze the center of mass, velocity, and changes in COM in 110m hurdling technique that may influence hurdle clearance time and the lead leg. Methods: Three athletes participated in this study there were top professional athletes in Taiwan. Two High-speed CCDs were separately placed on either side of the third hurdle in the forth lane. The first High-speed CCD was positioned in front on the left side of the hurdle and the second was positioned on the right side of the hurdle at 45 degrees. Both CCD’s were programmed to simultaneously record three dimension images of hurdlers motion. In order to digitalize the hurdlers kinematic data, SIMI Reality Motion System was used to calculate the necessary kinematics parameters. Results present center of mass, velocity, and changes in COM correlated highly to placement of the lead leg and leg abduction. Every athlete must adjust their motion according to their technique ability to achieve the most efficient hurdle clearance time. Success in hurdling is largely determined upon the mastering technique of running velocity and coordinating the clearance time over the hurdle. There are numerous factors that effect hurdling; however the most important factor is the technique of overcoming the hurdle. Results: In this study our results indicated not only did hurdling clearance technique affect the success of the athlete but also the degree of leg abduction of the lead leg from taking off to landing and the ankle joint maximal horizontal movement change during the landing phase. Conclusions: Finally, observation of the abduction angle of the lead leg movement was influenced by the bodies center of mass.