The optimal timing of surgery depends on a variety of factors, including the complexity of the congenital malformation, the age and weight of the child, and the systemic development and nutritional status. Generally, for simple congenital heart, 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 in some cases, there will even be an increase in 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.