In this paper, a multi-rigid-body system dynamics method, combined with OpenSim model, was used to experimentally test and simulate and analyze 100 subjects. Visual3D was used to verify the validity of the OpenSim model. The biomechanical characteristics of the lower limbs in jumping exercise were analyzed by intergroup comparisons of kinematic data, electromyographic signals of the muscles, and center of mass displacement parameters. There were significant differences between group I and group II in the knee joint angle and angular velocity (P<0.05). The muscles that exerted the most force during jumping were the tibialis anterior muscle and the rectus femoris muscle in group I. The muscles that exerted the most force in the process of jumping were the tibialis anterior muscle and the rectus femoris muscle in group II. In group II, the medial head of gastrocnemius muscle and rectus femoris muscle exerted the most force, and the excessive tension of the supporting leg muscles was one of the main reasons for the poor jumping effect. The representatives of group I all had a free time of more than 0.7s, and the displacement of Z-axis vertical direction was more than 0.7m, which verified that the full utilization of rapid force in the stomping stage played a decisive role.
