Congenital heart disease is divided into two categories based on the patient’s cardiovascular malformation, the shunting of blood from the heart, and whether the lips and nails are cyanotic. The first category is non-cyanotic congenital heart disease, which is mild; the second category is cyanotic congenital heart disease, which mostly has more complex cardiovascular malformations. In non-cyanotic congenital heart disease, blood is shunted from the left atrium left ventricle to the right atrium right ventricle through the internal defect of the heart, which occurs to a serious degree and produces pulmonary hypertension, resulting in high pressure throughout the right atrium right ventricle. If the pressure on the right side of the heart is higher than the left side, the unoxygenated venous blood on the right side will flow backwards to the left side and flow to the whole body through the left atrium left ventricle, triggering cyanosis, and the consequences will be serious.