Some children with congenital heart disease still have murmurs after surgery, and many parents do not understand how this happens. In fact, some children with congenital heart disease may still have murmurs after surgery due to sutures, patches, ligatures, etc., which cause local blood flow irregularities or eddies. Some children may also have murmurs due to residual shunts or stenosis or incomplete closure of the valve after surgery. In some children, such as those who have a body-pulmonary shunt, a murmur may be present because a shunt has been established between the pulmonary artery and the aorta, and the shunted blood flows from the aorta to the pulmonary artery during both systole and diastole, and such murmurs are often continuous. As can be seen, some children may have murmurs of different degrees after surgery, and these murmurs should be analyzed on a case-by-case basis, and the parents of the children should not worry too much after surgery.