In order to find out the lack of technical movements of trampoline athletes,provide reference for training and improve training efficiency.Mainly using the video analysis method,taking five trampoline athletes from Yangquan Sports School as the research objects,the kinematics data of trampoline athletes during the online take-off are studied and analyzed.Studies have shown that athletes cannot obtain a higher flying height due to the imperfect angles of the shoulder,hip,and knee joints when they take off online.It is recommended to improve the coordination between the hands and the body and increase the muscle strength of the hip and knee joints.