Ventricular septal defect (VSD) is the most common congenital heart disease in clinical practice, accounting for about 30% of all congenital heart diseases. The surgical treatment of VSD has been developed over the past 60 years and its technology has become very mature, but the classical surgical treatment, which needs to be performed under extracorporeal circulation, is relatively traumatic and needs to bear the effects of extracorporeal circulation on the systemic organs, with a certain degree of complications, and leaves a large surgical scar after surgery, which has a certain impact on the life and psychology of patients. Although the interventional therapy developed over 10 years has the advantages of small surface trauma and fast postoperative recovery, it is prone to serious complications such as damage to the tricuspid tendon, aortic valve, femoral artery and blocker dislodgement due to its long and tortuous surgical path, and even requires emergency surgical treatment in serious cases; moreover, interventional therapy prefers larger blocker models due to the fear of blocker dislodgement, thus The cardiac conduction system is vulnerable to compression. In contrast, we combine surgery and blocker method, combining the advantages of both methods and discarding the disadvantages of both methods, and use blocker to treat congenital heart disease ventricular septal defect through a small incision in the lower part of the sternum, which has achieved very satisfactory clinical results. This method has the following advantages: 1. less traumatic surgery, avoiding the blow to the heart by extracorporeal circulation, fast postoperative recovery, small surgical scars left behind, and less psychological impact on the patient; 2. a more suitable size of blocker can be chosen, and the probability of heart conduction block is smaller and safer; 3. the path is short, and damage to the heart valves and blood vessels can be avoided; 4. the age range is expanded, and the age of patients treated with blockers is expanded to 6-12 months. age to children 6-12 months of age. The indications for treatment of congenital ventricular septal defect with a small transseptal incisional blocker are: children with pure ventricular septal defect (or combined atrial septal defect or arteriovenous ductus arteriosus), weight >6 kg, ventricular defect staging including perimembranous, intracristal, subcristal, and myocardial ventricular defects, defect range of 3-6 mm, upper edge of VSD ≥2 mm from the right aortic coronary valve, absence of aortic right coronary valve prolapse into the VSD and aortic regurgitation.