Osteoarthritis of the knee is one of the most common joint diseases in the elderly and is the main cause of disability in the elderly, seriously affecting their quality of life and causing great distress. Therefore, the active prevention and treatment of this disease is a major issue in the daily life of the elderly and should not be taken lightly. 1, try to avoid obesity, to prevent aggravating the burden of the knee joint, once the body is overweight, we must actively lose weight, control weight. 2, pay attention to walking and labor posture, do not twist the body to walk and work. 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), sitting and standing for a long time, but also often change positions to prevent the knee joint fixed a posture and excessive force. 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 should be well prepared activities, gently stretch the knee joint, so that the knee joint fully active 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, when riding a bicycle, to adjust the height of the seat, to sit on the seat of the two feet in the pedals, both legs can be straight or slightly bent for the appropriate, the seat is too high, too low or riding uphill when pedaling hard, the knee joint have adverse effects, should be overcome. 6, the knee joint encounter cold, vasoconstriction, blood circulation becomes poor, often making the pain worse, so in cold weather should pay attention to keep warm, if necessary, wear a knee brace to prevent the knee joint from cold. 7. People with osteoarthritis of the knee should try to walk up and down stairs, climb less, stand less, and lift less heavy objects to avoid overloading the knee joint and aggravating the condition. 8, people with osteoarthritis of the knee, 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 to protect the diseased knee joint. According to research, people with knee osteoarthritis, swimming and walking are the best exercises that 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. Secondly, sit-ups, push-ups, bridge arches and the repeated practice of raising and lowering the two retreats on the supine bed, imitating pedaling a bicycle, are the best exercises for patients. 9, in terms of diet, should eat more food containing protein, calcium, collagen, isoflavones, such as milk, dairy products, soybeans, soy products, eggs, fish and shrimp, kelp, black fungus, chicken feet, pig’s feet, leg of lamb, beef tendons, etc. These can not only supplement protein, calcium, prevent osteoporosis, but also grow cartilage and joint lubricating fluid, but also supplement estrogen, so that the bones and joints better calcium metabolism and reduce the symptoms of arthritis. 10, in terms of treatment, once the knee joint pain, we must actively treat, take hot compresses, physical therapy massage and other simple therapy, it can control the symptoms, such as pain still can not stop, under the guidance of doctors, can take anti-inflammatory pain, inflammation and pain Xikang, Fotalin, ibuprofen, Fenbid, etc.. At the same time, some pain relief sprays and creams can be used externally. Glucophage capsules (glucosamine) are effective for this disease and need to be taken for a long time to be effective. If the disease does not improve with medication, and it affects walking and daily life, it can be treated with arthroscopic technology in a large hospital, or joint replacement can be done to restore joint function and maintain a good quality of life.