The paper takes the basketball players′take-off ability of layup shot as objects of study , by means of study method of kinematics measurement.Research results show that the buffer speed of knee joint is an important manifestation of basketball players′take-off ability of layup shot.Basketball players′step take-off power is mainly determined by extensors′maximum effort of hip joint and flexors′accelerating force of knee joint; Coordination of actions is determined by the eccentric ability of the central foot and lifting time of non central leg .The stability of the action is determined by the maximum strength level of ankle extensor muscle.We should strengthen exercises of the extensor strength of ankle joint.%采用运动学测量的研究方法，对篮球运动员行进间投篮跨步起跳能力进行研究，结果表明，缓冲速度快、时间短是篮球运动员行进间投篮跨步起跳能力的重要体现；篮球运动员的跨步起跳力量主要由髋关节伸肌最大力量和膝关节屈肌的快速力量决定；动作协调性主要由中枢腿的退让收缩能力和非中枢腿的上抬时机决定；动作的稳定性由踝关节伸肌肉最大力量水平决定，需要加强踝关节伸肌力量练习。
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