Congenital heart disease is a cardiovascular disease that is present from birth, including atrial septal defect, ventricular septal defect, patent ductus arteriosus, and tetralogy of Fallot. The best time to treat congenital heart disease depends on a number of factors, including the complexity of the congenital malformation, the child’s age and weight, and the child’s general development and nutritional status. Generally, for simple congenital heart disease, it is recommended to be 1 – 5 years old, because too young, low weight, poor systemic development and nutritional status will increase the risk of surgery; too old, the heart will compensate for the increase in size, and some may even have increased pulmonary artery pressure, which will also increase the difficulty of surgery and longer recovery time after surgery. For those with combined pulmonary hypertension, serious congenital malformations that affect growth and development, malformations that threaten the life of the child, or complex malformations that require staged surgery, the earlier the surgery the better, regardless of age.