Abstract: By means of literature review, this paper analyzed the definition, purpose, physiological mechanism, function and main influence factors of deceleration in lower limb movement, aiming to arouse the attention of China's sports workers and better understand deceleration in competitive sports. The results show that deceleration exists in various types in low limb movement. The main purpose of deceleration is to reduce or terminate the body momentum in the shortest possible time, improve the performance of subsequent restart and direction change, and finish the movement. The physiological mechanism of deceleration is mainly based on the stretch-shorten cycle and the eccentric contraction of muscle. The role of deceleration is to influence athlete's performanceand the risk of injury. Deceleration is influenced by many factors, among which deceleration technology, strength and dynamic balance are the main ones. In order to improve athlete's ability to decelerate, more specific training methods should be adopted.