Abstract:For relieving pain and restoring joint function and gait of end-stage hip and knee arthritis and partial severe joint trauma, joint arthroplasty is one of the most effective treatments currently, despite of the fact that the patients may still have pain and abnormal gait in some extent postoperatively. Three-dimensional gait analysis system is a set of gait evaluation tool with the advantages of comprehensive- ness, objectivity, high accuracy, high efficiency, and is widely used in the clinical research related to the human nervous system and motor system. With the help of this system, it does accurately measure and analyze the biomechanical and kinematic data during the movement process before and after hip and knee arthroplasty, providing data support for diagnosis, treatment and rehabilitation training. This paper briefly summarizes the application of three-dimensional gait analysis system in hip and knee arthroplasty and following rehabilitation train- ing, providing a reference for the further application of three-dimensional gait analysis system in optimizing the preoperative, intraoperative and postoperative treatment plan.