Inclusion Criteria:  （1） meeting the criteria of knee arthritis established by American Society of rheumatology （ 2) Total knee arthroplasty was performed for the first time （ 3) Good Chinese reading and comprehension ability （ 4) The patient's condition was stable, and there were no serious diseases of the heart, lung, brain and other important organs （ 5) Informed of the study and signed informed consent.  Exclusion Criteria:  （1）deep venous thrombosis of lower extremity （ 2) Other diseases affecting walking function （ 3) Suffering from cognitive or mental disorders （ 4) Had a history of knee surgery