Congenital heart disease has different symptoms depending on the classification. Based on hemodynamic combined with pathophysiological changes, congenital heart disease can be classified as cyanotic or non-cyanotic. Cyanotic types are mostly of the right-to-left shunt type (e.g., tetralogy of Fallot, macrovascular misalignment). Non-cyanotic types are mostly non-shunt or left-to-right shunt types. No shunt includes pulmonary stenosis, aortic constriction, etc. The left-to-right shunt category includes atrial septal defect, ventricular septal defect, and patent ductus arteriosus. Some precordial diseases may have no obvious symptoms and only a heart murmur may be heard during an occasional physical examination. The symptoms of congenital heart disease are as follows: 1. Cyanotic congenital heart disease: Patients can obviously see purple lips, cheeks and nails after birth; shortness of breath and paroxysmal dyspnea are also one of the common symptoms, which appear more often after crying or exertion; children appear squatting. Severe patients can have hypoxic attacks, manifested as pale face, weakness of limbs, paroxysmal syncope and convulsions. 2, non-cyanotic congenital heart disease: repeated respiratory infections, colds, bronchitis, pneumonia, and even pneumonia-induced heart failure; feeding difficulties, such as weak sucking, eating and stopping, some children appear to refuse food, choking and coughing. In older children, growth retardation, weight loss, fatigue, and edema may occur. These children usually do not develop cyanosis, but if left untreated, cyanosis may appear at a later stage, which also indicates that the opportunity for surgery has been lost. Early diagnosis and early treatment of congenital heart disease are very important. If necessary, echocardiography, cardiac catheterization or cardiovascular angiography should be performed.