Heart murmur in children is usually caused by atrial septal defect, ventricular septal defect, arterial duct failure and other conditions, which can be treated by drugs, surgery and other ways. 1. Atrial septal defect: due to abnormal development of the atrial septum during embryonic period, the atrial septum can not be completely closed, resulting in atrial septal defect, because of the high blood flow in the right heart system, accelerated blood flow, pulmonary artery stenosis, resulting in murmur when the child’s blood flow increases, which can be treated by atrial septal defect closure surgery. 2. Ventricular septal defect: if a child has congenital ventricular septal defect, when the child’s heart contracts, the blood flows from the left ventricle to the right ventricle through the ventricular septal defect, resulting in a murmur, which can be treated with drugs such as digoxin tablets, deacylated floral glycosides, furosemide tablets and other medications, or can be repaired with surgical treatments. 3. Arterial ductus arteriosus: When the arterial ductus arteriosus is not closed, the blood from the aorta flows through the ductus to the pulmonary artery, causing the blood to flow from the high-pressure area to the low-pressure area, which produces a murmur in the heart when it flows through the ductus arteriosus. before the age of 1 year, it can be observed for the time being, and some of these children may close it naturally. If the catheter does not close after the age of 1 year, surgical treatment, such as percutaneous ductus arteriosus blockage, may be an option. Children with heart murmurs need to rest, avoid strenuous exercise, and have their heart checked regularly. If they are not feeling well, they should be treated under the guidance of a doctor, and medications should be used according to the doctor’s instructions in order to avoid delays in their condition.