With the skill development in the vaulting event in male gymnastics, it was important to decrease the error and improve the performance throught the biomechanical analysis. Takei(1991) reported that gymnastics had greater center of mass(CM) horizontal velocities of hurdle and preflight, and departed form the horse with significantly greater vertical velocity of CM, which resulted in significantly greater height, larger distance, and longer time of postflight. The horizontal velocity and vertical velocity of CM at horse takeoff are important factors of successful performance. The purpose of this study was twofold: (a) to identify the mechanical factors that are associated with successful performance of the handspring forward and double salto forward turn of vaulting, and (b) to compare the results of the present study with those of the 1988 Olympic gymnasts to gain insight for improvement of performance. The subject was a world class Romanian gymnast competing in the 1998 China Motor International Gymnastic Cup Championship in Taipei. Two Peak-Performance high speed video cameras operated at 60Hz were simultaneously used to record the performance of the subject. Demperster (1955) inertial characteristics of body segments were used to calculate the subject's body CM. Kinematic variables were calculated by Peak Performance Motus system, and the raw data was filtered with Butterworth algorithm. The results (Table I indicated the followings: (I ) The better gymnast had greater horizontal and vertical velocity of CM at hurdle and horse takeoff, (2 ) The better gymnast had greater vertical displacement of CM during the postflight phase. (3 ) The better gymnast had a longer postflight time which will help control during landing.