Atrial septal defect is a common congenital heart disease, if by size, atrial septal defect diameter >5mm, there are indications for surgery. If counted by age, usually children over 2 years old children can do, under 2 years old is not necessary, as follows: 1. If the atrial septal defect <5mm, central type atrial septal defect can be done without surgery, every 0.5 years or every 1 year to do cardiac ultrasound review can be done, especially 2-3mm atrial septal defect, no need to do surgery. However, whether it is a central septal defect, superior or inferior septal defect, and >5mm, surgery can be done, including classical open septal defect repair and interventional approach for septal occlusion. The advantages and disadvantages of blocking surgery and interventional surgery are different, and blocking can be done as much as possible. Central atrial septal defect is more suitable for blocking, while lower septal defect blocking is less suitable; 2. If the child is over 2 years old, the diameter of peripheral blood vessels is already thicker, so intervention will not damage the blood vessels, will not affect the blood supply to the lower limbs, and will not produce complications. If done under 2 years of age, it is not suitable for the child to tolerate anesthesia or various operations, which will affect the treatment effect.