Osteoarthritis of the knee joint is a chronic disease that may be asymptomatic in the early stages and then gradually develops pain and stiffness. The pain is often accompanied by changes in posture in daily life, such as when squatting, when turning, when standing up after sitting for a long time, and when going up and down stairs, but is not obvious at other times. After a few moments of activity, the stiffness and pain are relieved, but when the activity is strenuous, the leg feels uncomfortable again, and there is a popping sound and a rough rubbing sensation and friction sound. Osteoarthritis of the knee is one of the most common joint diseases in middle-aged and elderly people, and is also the most important cause of disability in middle-aged and elderly people, which seriously affects their quality of life. Therefore, it is very important to actively prevent it early. 1, to pay attention to their living environment, to avoid the room too dark and humid, do not put the bed in the door and window ventilation. In autumn and winter, the elderly should pay attention to the neck, feet, ankles and knees. Ankle, knee warmth, with the change in temperature to add clothes in time to avoid catching cold. 2, try to avoid obesity, to prevent aggravating the burden on the knee joint, once the body is overweight, we must actively lose weight, control weight. Avoid squatting for a long time, because the weight of the knee joint when squatting is 3 to 6 times its own weight, squatting at work (such as car mechanics, sand turners) is best changed to a low sitting position (sitting on a small bench), it is best not to climb stairs, mountaineering activities, which can easily cause joint damage. 3, do not wear high heels when walking long distances, wear thick-soled and flexible soft-soled shoes to reduce the impact on the knee joint, to avoid wear and tear on the knee joint. 4. When participating in physical exercise, prepare for the activity by gently stretching the knee joint and allowing the knee joint to fully move before participating in strenuous exercise. When practicing leg press, do not lift your leg too high to prevent excessive strain on the knee joint. When practicing taijiquan, do not squat too low, and do not play several sets in a row to prevent injury to the knee joint from being overburdened. 5, people with osteoarthritis of the knee joint, both to avoid excessive fatigue of the knee joint, but also to carry out appropriate functional exercise to increase the stability of the knee joint, to prevent muscle atrophy of the leg, which not only relieves joint pain, but also prevents the progress of the disease, do not think that only rest and inactivity, in order to protect the diseased knee joint. According to research, swimming and walking are the best exercises for people with knee osteoarthritis, as they do not increase the weight-bearing capacity of the knee joint, but also allow the muscles and ligaments around the knee joint to be exercised.