Interventions are becoming more and more popular among parents of children because they are less invasive, less risky, and aesthetically pleasing without leaving scars. Generally, six follow-up visits are required one month, three months, six months, one year, two years and three years after the intervention. So is follow-up important? Certainly not optional. However, there will be short-term edema around the valve after expansion, and the postoperative status does not fully reflect the efficacy of the expansion, and individual children may have less than optimal results or re-stenosis due to valve development and other reasons, and need to be treated again. The key to follow-up is the first three visits, and the number of follow-up visits can be reduced after 6 months if there are no abnormalities. If there is no residual shunt, the most important follow-up is the first three visits, and the number of follow-ups after 6 months can be reduced if there is no abnormality. However, if there are residual shunts and other conditions, follow-ups should be completed as required. Although the amount is very small, there are individual differences and some children may have a tendency to bleed in a hypocoagulated state, so timely follow-up is needed to adjust the dose. Individual children may develop arterial atrial leakage, which needs to be treated promptly. Therefore, it is necessary to complete a 3-year follow-up. In addition to the need for anticoagulants as in the case of atrial septal defect, postoperative arrhythmias are also more likely to occur after interventional treatment of ventricular septal defect, and various conduction blocks may occur. Therefore, follow-up is more important and should be completed for 3 years as required. It is important to complete the 3-year follow-up as required. It is also important to follow up promptly in case of unexpected cases. Although post-treatment complications may occur in a very small number of interventions, the incidence of complications is much lower than that of open-heart surgery. For timely management, postoperative follow-up is still very important.