When is the right time to perform heart surgery on a child with preexisting heart disease? This is a question of great concern to the parents of children with the disease, but it is difficult to answer this question simply because of the different types of precordial disease and differences in the condition, and many cases need to vary from person to person, and also according to the degree of medical conditions permitting. The choice of surgery time is generally considered from the following aspects: 1, the possibility of natural healing: Although very few precordial diseases can heal naturally, but some of the common foramen ovale, atrial septal defect and ventricular septal defect will indeed heal naturally, which is closely related to the site and size of the defect, according to clinical experience, if the defect is in a very easy to heal parts, no signs of pulmonary hypertension, it is not necessarily urgent According to clinical experience, if the defect is in the part that can easily heal and there is no sign of pulmonary hypertension, it is not necessarily urgent to operate, regularly observe the possibility of closure, wait until 2-3 years old and still no closure (individual can be up to 5-6 years old), then surgery should be considered, otherwise the greater the impact on the prognosis of the child. 2, the severity of the disease: Although the majority of children with precordial disease will not be well without heart surgery, the choice of surgery time also depends on the severity of the disease. For example, if the left-to-right shunt type of precocious heart disease combined with severe cardiac and pulmonary insufficiency cannot be effectively relieved and controlled by medication, the child should be operated in time. Cyanotic preconditioning, with severe cyanosis and frequent episodes of hypoxia, should also be treated with early surgery if it cannot be controlled by medication. According to the development of modern cardiac surgical treatment, the operation is no longer restricted by age, and children with critical conditions who cannot undergo cardiac correction surgery immediately can undergo reduction surgery first and then corrective surgery later. -In the case of cyanotic preconditioning, the surgery should be performed at 6 months of age. 3, the presence of combined pulmonary hypertension: left-to-right shunt type of precocious heart disease can be combined with pulmonary hypertension, and pulmonary hypertension directly affects the surgical indications and surgical results, if there are signs of pulmonary hypertension, and there is a development trend, early surgery should be treated.