Rehabilitation exercises after knee surgery mainly include ankle pump training, quadriceps exercises, straight leg raising exercises, knee flexion and extension exercises and so on. 1. Ankle pump training: the patient lies flat on the bed in supine position, presses the foot downward and then hooks it upward for two to three minutes each time, and does it ten to fifteen times per hour, until it is fully recovered and the swelling of the whole calf and knee joints is completely eliminated. 2. Quadriceps exercise: patients lying on their backs, toes up, straighten the leg, tense the thigh muscles, you can touch the thighs with your hands, so as to feel the tension of the thigh muscles, so that the knee joints are close to the bed to maintain ten seconds or so, you can do it ten to fifteen times within two minutes, until the patient’s thighs feel fatigue. 3. Straight leg elevation exercise: lie on your back, put your leg straight on the bed, in the case of straight thighs and toes facing up, lift your leg off the bed, lift the angle and the angle you can lift up to the maximum degree, keep it elevated for ten seconds and then slowly put it down, repeat this action until the patient’s thighs feel fatigue. 4. Flexion and extension exercises of the knee joint: complete the following actions after applying painkillers prophylactically to the patient, ask the patient to relax, hold the ankle with one hand, hold the popliteal fossa with the other hand, and passively flex the knee at 90°, or ask the patient to sit on the edge of the bed, and flex the knee in the same way. Sitting up by the patient himself, will straighten the knee joint, hands on the affected knee joint downward pressure, to the pain can be tolerated as appropriate patients can not be carried out on their own, can be taken after lying down position, straighten the affected limb, assisted by others to press. Patient’s recovery situation is different, can also be in charge of the guidance of the doctor to exercise, such as discomfort, timely medical treatment, to avoid delays in the condition.