本文建立人体的四刚体模型,分析原地跳跃运动。将各关节角取作广义坐标,其中膝关节角作为控制变量,其变化规律根据实际跳跃过程的摄影记录确定。利用动力学方程确定其它关节角及蹬地力的变化规律,并计算离地时刻及相应的腾空高度。根据实际人体参数的数值计算结果可以解释原地跳跃运动的腾空高度与肌肉最大收缩力、爆发动及人体参数之间的关系。 This article builds a four-body model of the human body and analyzes the jumping motion in situ. The joint angle taken as a generalized coordinates, including knee angle as a control variable, the change rule according to the actual jumping process of photographic records to determine. Kinetic equations were used to determine the variation of other joint angles and pedaling forces, and the time of departure from the ground and the corresponding vacancy height were calculated. According to the numerical calculation results of actual human body parameters, it can explain the relationship between the vacant height of in-situ jump motion and maximum muscle contraction force, burst motion and human body parameters.