• Patients must between 1 and 14 years old.

• Patients who have congenital or secondary pulmonary artery stenosis (including pulmonary artery trunk, left pulmonary artery and right pulmonary artery), and meeting one of the following criteria:

• A: The pressure gradient across the stenosis ≥20mmHg measured by catheter; B: The degree of pulmonary artery stenosis ≥50% ( calculated by (diameter of adjacent normal segments - residual lumen diameter of the stenosis segment)/diameter of adjacent normal segments ×100%); C: The ratio of right ventricular systolic pressure to aortic systolic pressure ≥50%.

• Patients and whose family have high compliance, voluntarily participate in and sign the informed consent form, and complete the 2-year follow-up.

• Patients have life expectancy \>2 year after successful stent implantation.