The defect on the right and left atrial septum is called atrial meteoric defect, which accounts for about 5%-10% of congenital heart disease. The murmur of atrial defect is very light and not easy to hear, and is often detected only when the school-age children are examined. The atrial defect is located at the site of the foramen ovale, which is the central type or II foramen type; at the lower part connected with the mitral and tricuspid annulus, which is the primary foramen type, or I foramen type; at the location where the superior and inferior vena cava enters the right atrium, which is the vena cava sinus type; and at the coronary venous sinus, which is the coronary venous sinus type. Unless there is a huge atrial defect, symptoms usually rarely appear in the early stage, and small atrial septal defects can be left intact for life. However, some data report that recurrent cerebral infarction may be related to the atrial septal defect, which is caused by small emboli from the venous system, entering the left heart through the atrial defect to the arteries of the brain and causing cerebral infarction. Therefore, some physicians have suggested that patients with small atrial defects and end closure of the foramen ovale can be considered for closure by sealing, without direct intracardiac surgery. There are several methods to close the atrial defect by catheter, most of them require atrial defect less than 2 cm. medium to large atrial defects need surgery, and the results are very satisfactory. currently, minimally invasive blocking is carried out in cardiac surgery to reduce the complications of surgery. If the atrial defect develops to severe pulmonary hypertension, the surgical result is poor. Therefore, it is important to see a specialist as early as possible and decide whether to follow up or treat the patient for a long time under the guidance of the doctor.