At present, the common congenital heart diseases suitable for catheter intervention in China are: (1) atrial septal defect (ASD, central type); (2) ventricular septal defect (VSD, perimembranous and muscular); (3) patent ductus arteriosus (PDA, tubular and funnel type); (4) patent foramen ovale (PFO); (5) pulmonary stenosis (PS); (6) aortic stenosis (AS); ( (7) arteriovenous fistula; (8) aortic constriction (COA). Interventional treatment mainly takes the form of both blocker occlusion and balloon dilation. For ASD, VSD, PDA, and arteriovenous fistula, blocker occlusion is used (Amplatzer blocker is currently the most commonly used), while balloon dilation is used for PS, AS, COA, and other diseases. 1, Pulmonary valve stenosis dilatation: mainly for simple PS with transvalvular pressure difference ≥ 4, 7 Kpa (35 mmHg); valve dysplasia type mostly also effective; palliative therapy for complex congenital heart disease with PS; postoperative restenosis dilatation treatment. The balloon/valve annular ratio is generally between 1,1 and 1,5. 2. Percutaneous balloon aortic valvuloplasty: only for simple AS with differential pressure greater than 6 or 7 Kpa (50 mmHg); balloon/valve annulus ratio less than 1 is appropriate; restenosis after stent placement after COA dilatation can still be treated by balloon dilatation. 3. Indications for occlusion of ASD: (1) age usually ≥3 years; (2) central left-to-right shunt ASD of 4-35 mm in diameter; (3) distance from the edge of the defect to the coronary sinus, superior and inferior vena cava ≥5 mm, and to the atrioventricular valve ≥7 mm; (4) diameter of the atrial septum greater than the diameter of the left atrial side of the selected occlusion parachute; (5) patients with ASD with residual shunts after surgical procedures ( left-to-right shunt); (6) those with significant left-to-right shunt remaining after mitral valvuloplasty; (7) other cardiac malformations that do not combine with surgical procedures; (8) those with moderate or higher pulmonary hypertension, which require confirmation of pulmonary artery pressure and right ventricular downward trend by blocking test. 4, VSD blocking indications: membrane: (1) age usually ≥ 3 years; (2) simple VSD with hemodynamic changes; (3) the upper edge of the ventricular defect is at least 2 mm from the aortic valve, without right coronary valve prolapse into the right ventricle and regurgitation; myocardial VSD: diameter ≥ 5 mm; surgical residual shunt; ventricular defect after infarction or trauma.