The incidence of pulmonary valve stenosis accounts for approximately 8% to 10% of congenital heart disease, and the causes of embryonic developmental disorders vary for all types of pulmonary stenosis. Because of the physiological characteristics of the fetal left and right ventricles in parallel circulation, the blood flow through the pulmonary valve is only 50% of that after birth, so it may be difficult to clearly determine or underestimate the mild to moderate pulmonary valve heart in the fetal period. 37 cases were followed up in our department, and the diagnosis of pulmonary valve stenosis was excluded in one case after birth, and five cases were operated, and the rest were under clinical follow-up. The difference in pressure between the right ventricle and the peak pulmonary artery (systolic pressure) is less than 40 mmHg for mild stenosis, which is clinically asymptomatic and does not require surgery for normal growth and development and life ability; a pressure difference of 40 to 100 mmHg for moderate stenosis, which generally appears around 20 years of age with palpitations and shortness of breath after activity, and should be followed up after birth for observation and timely treatment when the right ventricular free wall begins to thicken; a pressure difference of 100 mmHg Above 100 mmHg pressure difference is severe stenosis, which often appears in newborns and infants with hypoxia, cyanosis, and obvious symptoms and requires timely treatment. For mild to moderate pulmonary stenosis, percutaneous pulmonary balloon valvuloplasty can be performed; for severe pulmonary stenosis, pulmonary valvuloplasty under extracorporeal circulation or right ventricular outflow tract patch widening should be performed. In neonates and small infants, surgical pulmonary balloon valvuloplasty or central shunt should be performed. The prognosis for surgical treatment is good, and induction of labor for this malformation is not recommended. Health care measures: 1. No special treatment or care is needed during the fetal period; 2. Normal delivery is possible without special delivery measures; 3. Cardiac ultrasonography is performed promptly after birth and the treatment plan is decided by a cardiologist. Treatment: 1. Mild pulmonary stenosis does not require treatment. Moderate pulmonary stenosis is treated with percutaneous pulmonary balloon valvuloplasty; 3. Severe pulmonary stenosis is treated with pulmonary valvuloplasty or right ventricular outflow tract patch widening under extracorporeal circulation; 4. Pulmonary valvuloplasty or right ventricular outflow tract patch widening under extracorporeal circulation is performed in newborns and small infants; surgical pulmonary balloon valvuloplasty or/and central shunt is also advocated nowadays. Long-term prognosis: 1. Mild pulmonary stenosis requires no treatment and leads to a completely normal life, study and work; 2. Moderate pulmonary stenosis can lead to a completely normal life, study and work after treatment; 3. Severe pulmonary stenosis is mildly limited.