There are many clinical classification methods for precocious heart disease, and a combination of them, according to pathology, pathophysiology, and clinical aspects, are classified as follows: non-cyanotic type: non-shunt class: aortic stenosis, aortic constriction, congenital mitral valve closure insufficiency, triatrial heart (no shunt), Marfan syndrome, pulmonary valve stenosis, pulmonary artery and its branches stenosis, right ventricular dysplasia, congenital heart position anomaly (no shunt) etc. Left-to-right shunt type: atrial septal defect, atrial septal defect combined with mitral stenosis, partial pulmonary vein ectopic drainage (without atrial septal defect), ventricular septal defect, corrected transposition of the great arteries combined with ventricular septal defect, coronary arteriovenous fistula aortic sinus aneurysm breaking into the right heart, patent ductus arteriosus, main pulmonary artery septal defect, complete atrioventricular canal malformation, etc. Cyanotic type: normal or decreased pulmonary blood flow: Farrer’s triad, Farrer’s tetralogy, pulmonary atresia (without ventricular septal defect), tricuspid inferior valve malformation, vena cava draining into the left atrium, pulmonary arteriovenous fistula, Eisenmenger’s syndrome, etc. Increased pulmonary blood flow type: single atrium, total pulmonary vein ectopic drainage, etc. More or less variable pulmonary blood flow: complete transposition of the great arteries, corrected transposition of the great arteries, double outlet of the right ventricle, single ventricle, permanent arterial trunk, tricuspid atresia, etc. The most common precordial diseases are interventricular defect, atrial septal defect, and arteriovenous insufficiency in second place; followed by simple pulmonary stenosis, tetralogy of Fallot, aortic stenosis and aortic constriction. As listed above, there are many types of precordial disease, often two or more anomalies occurring together, called complex precordial disease. In some cases, there is a stenosis at a certain point that makes it difficult for blood to pass through; in others, there is a hole between the chambers of the heart that is missing a part of the heart; in others, there is a mistake in the connection between the heart and the arteries and veins, resulting in the wrong direction of blood flow; and in some cases, although the heart is normally constructed, its muscles have abnormal contractile function.