The purpose of this study was to analyze the technique of Leg Beat Action during Giant Swing on Horizontal Bar using the kinematic data captured during 2000 China Motor International Gymnastic Cup. The movement of Giant Swing was divided into four phases by the body position. Before dismount form horizontal bar, the outstanding gymnasts performed 2-3 accelerated cycles of Giant Swing Leg Beat Action in order to get better grade. The main purpose of giant Swing Leg Beat Action is to make an efficient use of the angle changes of shoulder, hip and leg to speed up the swing speed and to utilize the elastic force of the bar in order to achieve more powerful upward movement when leaving horizontal bar. The major findings of this study are the followings: 1.When the swing movement through the potion of handstand “0”, the shoulder and hip should be bended and let the body close to the point of the hand grip to decrease the resistant torque in order to let the body passed the hand grip to decrease the resistant torque in order to let the body passed the position as soon as possible. 2.When the swing movement through the position of “90°”, straighten the body and let the center of gravity far away from the hand grip point for increasing the acceleration toque. At the same time, the swing speed should be in-phase with the deformation of the horizontal bar and the trunk should be stretched in extended arch position during pass the position “90°” to prepare the Leg Beat Action utilizing the flexion and extension of shoulder and hip. 3.When the body through down to the vertical line under horizontal bar, the head is kept in straighten up, the muscles in front of body are stretched and the shoulder is relaxed. At same time, the legs are speeded up upward through the position of 210° as soon as possible. By this way, the body is raised up naturally and the speed of Giant Swing is increased. 4.Bend the shoulder and hip joints to shorten the radius of swing and let the center of gravity moving quickly through the vertical position above the horizontal bar in order to benefit the next accelerated Giant Swing.