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Taking Xiangrong Liu, a Chinese female shot athlete, as the research object, the biomechanical analysis of the technical action of its backward slide-shot putting using the method of sports biomechanics was carried out. The study found that: in the gliding stage, Xiangrong Liu’s maximum speed of velocity of the shot and the maximum center of gravity of the body weight difference, the trunk lift amplitude is too large; support time in the transitional phase is too long; swing leg is not actively inserted; in the last force phase, she shot slower and the angle of shot is too large. Keywords—athletes; back-gliding; shot; kinematics I. RESEARCH PURPOSES There have been a number of elite athletes from Chinese Female Shot Put Team in the World Track and Field, and the women putters usually obtained gratifying results in the world track and field competition. However, those years, the level and grades of Chinese Female Shot Put are showing a downward trend, which is lower and lower than the level of world female shot put. This dissertation provides scientific theoretical bases for modifying the mistaken movements in the process of backward gliding shot put, through the deconstruction of Xiangrong Liu’s backward slide shot put 3D video, obtaining relative kinematic statistics. (Xiangrong Liu, the champion of the female shot put of China Throwing Game– Chengdu Site.) II. RESEARCH OBJECTS AND METHODS A. Research Objects Xiangrong Liu, born in 1988, 185cm height, a Chinese female shot-putter, is the champion of the female shot put of China Throwing Game – Chengdu Site. B. Research Methods In the use of two Japanese High Speed Camera – JVC9800 (50 frame per second) to capture a moving object in simultaneous video. The two cameras were set separately at the right behind and right side of the throwing range, and the angle between the two cameras is 90°, and the Photo-frequency is 50Hz. Then using the 3D Signal TEC V1.0C video analysis software to deconstruct the movements of the athlete, with the body model of Matsui Shuji (21 articulation points and 16 segments). The original statistics was smoothly processed by the low – pass filter, and the cutoff frequency is 8Hz. III. RESEARCH RESULTS A. Time Phasing Xiangrong Liu’s shot-put movement is right-hand-throwing back gliding shot put. With a view of facilitating research, we break-down the movement into four moments, three stages as follow:

A Kinematics Analysis of Back Gliding Shot Put Techniques of Xiangrong Liu