Sudden death can be caused by various heart diseases, more than half of which are caused by coronary heart disease. Inadequate blood supply to the heart generally refers to coronary heart disease, where the coronary arteries that supply blood to the heart muscle are at risk of sudden death due to atherosclerosis, narrowing or even blockage, which causes myocardial ischemia. Inadequate blood supply to the heart, myocardial ischemia and hypoxia or necrosis, manifested as chest tightness and chest pain. Previously, there are five clinical types of coronary artery disease according to the location and extent of coronary lesions, the degree of vessel obstruction and the speed, extent and degree of development of myocardial blood supply deficiency: asymptomatic coronary artery disease, angina pectoris, myocardial infarction, ischemic cardiomyopathy and sudden death coronary artery disease. Sudden death coronary heart disease is one of these types. Sudden death refers to death within 6 hours after the onset of the disease. Sudden death coronary heart disease is most likely to occur in midwinter. Patients are not too old and die quickly from sudden onset of cardiac arrest at home, work or public places. Half of the patients are asymptomatic before death. At present, it is believed that the occurrence of cardiac arrest in this type of patients is due to acute occlusion or spasm of coronary arteries on the basis of atherosclerosis, resulting in acute ischemia or even necrosis of myocardium, causing local electrophysiological disturbances and temporary severe arrhythmias, especially ventricular fibrillation. Timely improvement of ischemia, selection of antiventricular arrhythmia drugs if necessary, and application of buried automatic cardioverter-defibrillator will be helpful for long-term prevention of sudden death.