Clinical can be exercised by the following methods to protect the knee, as follows: First, resistance knee flexion and extension activities, can be assisted by sandbags or elastic bands, can make the quadriceps and calf triceps muscles to be exercised, so that the patient’s knee stability is improved, can protect the knee cartilage, meniscus and cruciate ligament. Exercise time is not less than one hour per day, while nutrition should be enhanced to promote muscle growth. Second, heel lift training, the patient should usually insist on lifting the heel to make the calf triceps contract, which can improve the muscle strength and intensity of the calf, thus providing protection of the knee joint stability. After the above training, the knee joint can be fully protected to avoid acute and chronic damage to cartilage, meniscus and other structures that produce clinical symptoms.