I. Understanding of TAPVC subtypes The classification of TAPVC into supracardiac, intracardiac, subcardiac and mixed types is a common clinical typing method. In clinical practice, it is found that a few subtypes have large variation, which brings some confusion to the treatment. The subtypes in our group were found intraoperatively in the early stage, and in recent years, we have been alert to the subtypes and can diagnose them more accurately before surgery. Cardiac ultrasound and cardiac catheterization have a 100% diagnostic confirmation rate, and the accuracy rate of pulmonary venous return location is about 97%, which is the main diagnostic tool at present. 3D cardiovascular imaging with CT can complement ultrasound. In our group, there were one case of posteriorly oriented supracardiac type and two cases of mixed type TAPVc, which were accurately diagnosed by CT reconstruction. II. Consideration of individualized TAPVC surgical protocols The surgical approach for TAPVc depends on its anatomical type. Typical Darling typing cases follow classical surgery, while subtypes require an individualized surgical plan. In supracardiac TAPVC, for example, the pulmonary veins open bilaterally in the superior cavity, at a certain distance from the superior vena cava into the atrium. If it is difficult to form a common trunk, a modified Wander procedure is performed; if the right atrium is found to be small intraoperatively, a modified Glenn procedure is performed if the possibility of right heart failure is high after the modified Wander procedure. Among the 3 subtypes of intracardiac TAPVC, the right atrial type has 4 pulmonary veins that flow back into the right atrium, and their openings are indefinite and irregular. It is necessary to carefully investigate the location of the pulmonary vein openings and ensure that the pulmonary vein openings are directed to the left atrial side and that the openings are unobstructed when the atrial septum is cut and the septal reconstruction is designed. Mixed TAPVC is individualized according to the classification in the literature, with better results. Some pulmonary vein inlets are close to the superior and inferior vena cava into the atrium, where conventional cannulation can interfere with surgical exposure. Low temperature and low flow perfusion, removal of the appropriate cannula, and application of single tube drainage with intracardiac suction can result in good exposure. If there are still operational difficulties, deep hypothermia may be considered to stop the circulation. After completion of pulmonary vein left atrial reconstruction, it is advisable to enlarge the superior vena cava if the intra-atrial plate obstruction affects the superior vena cava reflux. The “sutureless” anastomosis can be used to prevent postoperative pulmonary vein stenosis. The cure rate of TAPvC is gradually improving, and the morbidity and mortality rate ranges from 5% to 20% pJ, which is 5.9% in our group. In this study, the risk factor for surgery is AsD. In children with small ASD, the left atrium and left ventricle are poorly developed, which makes it difficult for them to take the role as the main pump for a while, and they are prone to difficulties in deconditioning after surgery and low cardiac output syndrome after surgery. In these children, percutaneous atrial septal enlargement is performed first to increase the blood flow in the body circulation and to give the left heart some exercise, which can improve the surgical efficacy. In our group, two cases underwent ASD enlargement in the neonatal period and surgical correction was performed after 2 months, which was a smooth procedure. Due to the small number of cases, further accumulation is needed. Another risk factor is pulmonary hypertension; TAPVC is prone to early development of pulmonary hypertension due to increased blood flow in the pulmonary circulation, which leads to pulmonary congestion, and pulmonary venous return obstruction, which leads to pulmonary stasis, and is prone to postoperative pulmonary hypertension crisis (especially severe pulmonary hypertension), which is difficult to control. Accordingly. The more effective measure is early surgical treatment.