The correction methods of O-legs for boys include splint binding method, corrective shoe inserts, surgical treatment, and non-surgical treatment is ineffective for the correction of O-legs if they are already adult males. The performance of O-leg is that when our lower limbs are straightened, the inner side of the ankles can be brought together, but the knees can not be brought together. If the collateral ligaments on the inner side of the knees are improved, O-leg can be improved. 1. Plywood leg binding method: make the body sit on a stool, use rubber bands to bind the knees to make them close together. Boys adhere to 1~2 months may improve, but the method can only improve, can not be completely treated. 2. Insole correction method: When walking, you can put on the insole for O-leg correction to improve the boys’ leg shape. 3. Surgery: If it seriously affects daily life, knee replacement or wedge osteotomy at the proximal end of the tibia can be performed to improve the O-legs, especially for adult males, surgery is the only effective treatment option. If a person with O-shaped legs feels pain during physical correction, the correction should be stopped. Immediately go to the hospital for examination, and the patient is advised to choose the specific improvement measures according to the doctor’s advice.