Walking down stairs, walking and running are common actions in daily life, but in elderly people with reduced functional capacity, they may lead to falls or injuries. The first motor neuroprotective mechanism that the body activates in order to cope with various situations to avoid falls is the regulation of lower extremity stiffness. Based on this, this study retrieved and collected relevant research results from databases such as China Knowledge, Wanfang, Google scholar and Web of science, with keywords such as elderly and lower extremity stiffness, and summarised the similarities and differences in the changes of lower extremity stiffness in different movement tasks. However, due to the small number of related studies, there is still a need to investigate the effects of movement interventions on the lower limb stiffness of the elderly in order to obtain more reliable regular characteristics and basis.