Osteoarthritis of the knee is a common and prevalent disease in the middle-aged and elderly population. The individual differences in the onset of the disease are large, and the early stage of the disease does not affect the working life, so it is easy to be neglected, and the disease is prolonged to disability. Therefore, the idea of health care for the knee joint is very important in the early stage. The effect of intervention in knee osteoarthritis, which begins in the state of desire for disease, is lifelong. I. Health education and joint care Health education can raise awareness of osteoarthritis of the knee among the target population, improve patients’ lifestyles, promote voluntary adoption of health-friendly behaviors and lifestyles through information exchange, eliminate or reduce risk factors for osteoarthritis of the knee, thereby preventing the disease and enabling patients to achieve optimal health status. Health education for osteoarthritis of the knee requires good interaction between health care professionals and patients. The content includes: 1. Knowledge of the disease: middle-aged and elderly people with knee symptoms often take the initiative to obtain health education about knee osteoarthritis by seeking medical care, browsing hospital information and doctors’ personal web pages. 2. Exercise instruction: Knee exercises should be chosen according to their physical condition, such as swimming, tai chi and walking, etc. Walk slowly and massage the knee joint for 20-30 min before and after exercise to relieve muscle pain. 3. Diet education: a light and nutritious diet is recommended. Eat more calcium-rich foods, such as fish, shrimp, eggs, soybeans, pork bones, etc.; eat more nuts, milk, fish, beans, fresh vegetables and fruits, etc., rich in vitamins, minerals, high protein, high calories, low-fat foods, and less high-fat, high-sugar diet; avoid alcohol, spicy and stimulating, cold, greasy food. 4. Avoid getting cold and damp, avoid sitting for a long time, especially not bending the knee less than 90°; obese patients should lose weight, to reduce the weight of active non-weight-bearing activities, avoid squatting, the seat position is elevated, use the toilet when using the toilet; pay attention to the warmth of the knee joint, can use knee pads. In the acute inflammatory stage, cold compresses can be used to reduce the patient’s pain, and in the chronic progressive stage, hot compresses can be used to relieve pain and stiffness, relieve muscle spasm and prevent contracture. 5. Psychological education: It is found in the clinic that some patients have worry and anxiety because the knee arthritis is long and prone to recurrence, and they do not know if they can get better. Encourage patients to look at their condition squarely, let them know the positive impact of a positive mindset on the disease, eliminate adverse psychology, and involve their families to help build confidence in overcoming the disease, and take medication and outpatient follow-up on time as required by medical advice.