In patients with funnel chest, the lower middle part of the sternum and the adjacent costal cartilage are depressed, making the distance between the sternum and the spine greatly reduced, thus compressing the heart behind the sternum and the lungs on both sides, causing a significant decrease in cardiopulmonary function, especially the bilateral diaphragm decreases significantly and seriously affects the gas exchange in the lungs, causing respiratory tract infections and making the activity tolerance much lower than normal. In addition, the appearance of the patient is obviously deformed and extremely unattractive, which seriously affects the psychological health development of the patient from childhood to adulthood, leading to psychological diseases and a serious sense of inferiority. Surgical treatment can timely expand the distance between the sternum and the spine, relieve the compression on the heart and lungs, promote the recovery of cardiopulmonary function, make the diaphragm lift up, and improve the lung capacity; especially to relieve the deformity in appearance. It makes the child’s physical and psychological development toward health.