Abstract: Objective: To find the key biomechanical factors affecting jump height by testing the biomechanical indicators of lower extremity of female basketball players in stop-jump tasks. Methods: 17 female collegiate basketball players were recruited from competitive sports institute of Beijing Sports University. Lower extremity kinematic and kinetic data of the joints of low extremity were collected simultaneously using 3-D Motion Analysis Raptor-4 system and Kistler force plate when participants executed stop-jump tasks. Gray relational analysis was used to identify the relationships between biomechanical indicators and jump height in female basketball players. Results: the effect of biomechanical factors on jump height are ranked as follows: center of gravity peak vertical velocity>hip peak angular velocity>knee peak angular velocity>takeoff time>ankle peak angular velocity> peak vertical takeoff force. Conclusions: (1) Among the factors influencing jump height, center of gravity peak vertical velocity is the primary factor. (2) Hip angular velocity has a strong effect on jump height than knee angular velocity and ankle angular velocity. (3)Peak vertical takeoff force is necessary but not sufficient for jump height.

Key words: female basketball players, jump height, biomechanical factors, gray relational analysis