1.Post-operative vaccination can be carried out 3 months after the operation of pediatric precocious heart disease. 2.If the baby has never been vaccinated after birth (i.e., not participated in basic immunization), the best time for the baby’s physical condition 3 months after surgery should be selected for catch-up vaccination. 3.If high fever and accelerated respiratory heart rate occur after vaccination, the condition should be closely observed and, if necessary, treated in contact with the local pediatrician of pediatrics.