The purpose of total knee arthroplasty is to relieve joint pain, correct joint deformities, and improve the functional status of the affected knee, thereby improving the patient’s quality of life. Postoperative function depends to a large extent on functional exercise and rehabilitation, and postoperative rehabilitation and functional exercise is a systematic and arduous task that, if done well, can be the icing on the cake, but if done poorly, can be the undoing of previous work. A thorough and systematic pre- and post-operative patient education, rehabilitation and functional exercise program is the basic prerequisite for the best surgical outcome and is the key to successful total knee arthroplasty. In recent years, joint replacement has developed rapidly in China, but not particularly in the field of rehabilitation, which still needs to be institutionalized, standardized and then individualized. The purpose of post-operative rehabilitation of the artificial knee joint at the First Affiliated Hospital of Henan College of Traditional Chinese Medicine, Li Huiying, is to: (i) strengthen the muscle strength of the periprosthetic flexors and extensors through muscle strengthening training, and to promote the recovery of whole body strength and status. ②To meet the patient’s needs of daily life and work through knee mobility training. ③Improve knee joint balance and coordination and ensure joint stability through walking and coordination training. ④Prevent postoperative joint adhesions, improve local or whole lower limb blood circulation, and avoid some complications through active and passive knee joint activities. ⑤ Improving the mental and psychological outlook of patients and stimulating enthusiasm for life. In order to achieve the above purposes in rehabilitation, the principles of individualized, comprehensive training and gradual progress should be followed. However, it should also be emphasized that although rehabilitation activities are an absolute indication for artificial total knee arthroplasty, rehabilitation exercises should be done with caution if the patient has high fever, rapid heart rate, hypertension, hypotension and severe dysfunction of vital organs. Before conducting rehabilitation exercises, factors related to the primary disease, the condition of the local knee joint, the patient’s general condition and complications, the patient’s spiritual, psychological and intellectual status and gender and age should be evaluated before making a rehabilitation plan. The function of the knee joint is mainly reflected in joint mobility and muscle strength of the quadriceps and slapping rope muscles, so the main content of rehabilitation is the enhancement of joint mobility and muscle strength exercises. We specified a set of rehabilitation exercise plan according to the requirements of conventional rehabilitation exercise, combined with our own clinical experience, in the following ways: Pre-rehabilitation: Pre-operative education for patients after admission, watching rehabilitation exercise videos, reading rehabilitation manuals, understanding the importance of rehabilitation in this surgery and the difficulties that may be encountered after surgery, making a rehabilitation plan together with the patient, and then performing rehearsals of rehabilitation activities, so that patients have a full The patient should be well prepared to cooperate and master the correct rehabilitation after surgery to achieve the rehabilitation effect. In particular, preoperative muscle strength training is very beneficial for rapid postoperative recovery. Early rehabilitation: within 3 days after surgery, the affected limb is painful during this period and a drainage tube is placed, so the exercise is based on elevating the affected limb, actively extending and flexing the ankle joint and interphalangeal joint as much as possible, and starting muscle contraction training for quadriceps and other muscles for 3-5 minutes every hour, or using a venous pump to prevent venous thrombosis of the lower limb. Mid-rehabilitation: 4 to 14 days after surgery, this period is the most critical for rehabilitation, mainly exercising knee mobility and periprosthetic muscle strength. ①CPM machine: Although controversial, it is very helpful for early and rapid recovery of knee function, initially 0 to 45°, increasing the range of motion by 10° per day for about 6 hours per day, reaching more than 90° at discharge. the intensity and frequency of CPM training gradually increase. ②Straight leg raise and quadriceps isometric contraction were performed for 3 to 5 minutes every hour, and the patient felt no abnormal discomfort after the exercise according to his own feeling. ③Active and passive knee flexion exercise: after CPM exercise, under the doctor’s guidance through: bedside supine, prone and lateral knee flexion and extension activities, bedside knee flexion and extension exercise, out of bed standing and squatting exercise, alternately, the doctor assisted the patient in passive knee flexion once a day, if the preoperative flexion contracture is serious, postoperative with sandbag compression of the knee joint, or nighttime plaster fixation. ④Walking exercise: 4 to 7 days after surgery, you can walk on the ground with the help of crutches to exercise joint balance. Achieve intraoperative joint mobility as much as possible in the middle stage. Late stage of rehabilitation: Within 2 to 6 weeks after surgery, the purpose of this period is to enhance muscle strength and maintain the acquired joint mobility, exercising at least 2 hours a day. Late stage of rehabilitation: Rehabilitation after 3 months postoperatively is usually neglected because most of them are no longer painful and function better at that time, but studies point out that long-term rehabilitation is of some significance to improve the stability of the patient’s knee joint, walking and stair climbing ability. Patients are also asked to come for review on a regular basis, pay attention to maintaining proper weight, preventing osteoporosis, avoiding too much strenuous exercise, and not doing strenuous jumping and sharp stop-and-go movements to prolong the life of the prosthesis as much as possible. In the process of rehabilitation exercise, some special problems will be encountered, such as: local bleeding, pain, wound exudate, lower limb swelling, limited range of motion of the knee joint, low value of the patient’s desire for rehabilitation, etc., which will affect the rehabilitation effect and must be given symptomatic treatment, especially the problem of pain, which is the main factor affecting the rehabilitation effect, through a survey of patients after TKA found that 60% of patients have severe pain. Research data suggest that pain may affect the speed of recovery and eventually knee mobility, thus emphasizing perioperative analgesia. The new concept of perioperative analgesia: preoperative analgesia: administered before the onset of pain to increase the pain threshold; intraoperative analgesia: local anesthetic medication to reduce the response of nerve endings to injury; postoperative analgesia: blocking the pain transmission pathway to minimize the side effects of medication and to avoid the addictive nature of anesthetic drugs. For perioperative analgesia of artificial total knee arthroplasty, we can achieve “multi-modal analgesia” and “prevent pain” instead of “stopping pain after it occurs”, so that patients can enjoy “Pain-free” knee arthroplasty. This has improved the patient’s compliance in choosing the surgery, and has allowed for a good recovery of the post-operative function of the knee joint and accelerated the recovery process of the patient in all periods after the surgery. It is important to note that the artificial knee joint has a flexion limit, and the current design of the various prostheses is basically between 110 and 135°, and generally after rehabilitation exercises can reach about 110° to obtain more satisfactory daily activities. The degree of flexion that can be achieved in the knee during and after rehabilitation is based on the product design flexion limits, and should not be exceeded in the blind pursuit of greater degrees, as this may result in joint damage. In conclusion, rehabilitation training after artificial knee arthroplasty should be human-centered, with evidence-based selection of training programs, following standardized and individualized rehabilitation procedures, emphasizing that the operator must pay attention to rehabilitation exercises and strengthen the supervision of the postoperative patient. All exercises should be performed without excessive fatigue, and the amount of activity should be gradually increased within the tolerable limits of the patient. Through the exercise should achieve: knee flexion and extension activities freely, and have a certain strength and flexibility, can squat, normal walking, unaided independent up and down stairs, basically meet the needs of life and work.