O-leg from mild to moderate or even severe, have certain harm, mainly in the following aspects: 1, affect the beauty of the shape, and even cause a person’s psychological inferiority complex, and seriously affect physical and mental health. 2, the development of heavy will lead to changes in the line of force of the knee joint, the gravitational effect of the inner knee joint increases, prematurely causing joint wear and tear, and eventually the formation of osteoarthritis and cause pain, and range of motion, and even affect daily life. With the accumulation of time and further aggravation, it can lead to unevenness of the hip and knee and ankle joint surfaces, which can lead to osteoarthritis of the hip and ankle joints, limping and even disability. Most arthritis of this severity can only be treated by joint replacement surgery, which will bring a huge financial burden to the family.