The main purpose of taking aspirin after routine atrial septal defect surgery is to prevent blood clots. This is because after surgery a foreign body will form in the heart, i.e. a blocker will form a blood clot. And the purpose of taking aspirin is antiplatelet, prevent thrombus, and after the measure of thrombus prevention, the body will be less prone to the manifestation of embolism. That is, the purpose of taking aspirin is mainly to prevent blood clots, prevent strokes, and embolism complications, so the patient must be allowed to insist on taking it. However, in the process of taking aspirin, attention should be paid to aspirin adverse reactions, such as gastrointestinal symptoms, skin mucosa and other bleeding conditions, and these abnormalities should be closely observed. To ensure the safety of atrial defect intervention and the patient can achieve effective recovery, we should seek medical attention in time when the situation is found.