Ventricular septal defect is a common congenital heart disease caused by embryonic hypoplasia of the ventricular septum. Whether or not an 8mm ventricular septal defect is a lifelong non-surgical condition depends on the location of the ventricular septal defect, whether or not the patient has clinical symptoms, and the prognosis after long-term observation. If a patient with a ventricular septal defect of 8 mm has no obvious clinical symptoms, such as shortness of breath after activity, clinical observation can be performed, but very few patients will heal naturally during observation, so surgery is not necessary. If the patients have no signs of healing of the ventricular septal defect 8mm after the age of 5 years, and are accompanied by developmental disorders, palpitation and shortness of breath after activities, recurrent lung infections, or even respiratory distress and acute left heart failure, then surgery is needed. In addition, if the patient with 8 mm ventricular septal defect is combined with other congenital heart diseases, he or she should undergo surgery as well. After the surgery, patients with 8mm ventricular septal defect need to develop good living habits, exercise moderately, maintain sufficient sleep, avoid physical labor, and reduce the burden on the heart. Since the resistance of the patients after surgery is relatively low, they should pay attention to the prevention of colds and flu to avoid infections, and they should go to the hospital regularly to check their cardiac function.