The life expectancy of patients with coronary artery disease depends on the severity of the disease and its treatment. In general, no serious complications as long as the active treatment of patients life expectancy is not significantly changed. Coronary heart disease is a common clinical cardiovascular disease, mainly due to coronary artery atherosclerosis and atheromatous plaque formation, resulting in insufficient blood supply to the myocardium and triggered by heart disease. Patients with mild cases need active treatment to improve myocardial blood supply and maintain cardiac function in a normal state. As long as no serious complications occur, it will not have a great impact on life expectancy, which can be considered as the life expectancy of the normal population. If a patient with coronary artery disease suffers an acute infarction or other conditions that cause severe insufficiency of blood supply to the myocardium leading to myocardial necrosis, the cardiac function will decline dramatically. Even with reperfusion therapy, it is difficult for the patient’s cardiac function to return to normal. Such patients have a shorter life expectancy, a relatively low survival rate, and a poorer quality of life. Therefore, when chest pain, severe arrhythmia and other uncomfortable symptoms occur, you should go to the hospital in a timely manner, and timely follow the doctor’s instructions for treatment, so as to avoid delaying the treatment time and affecting life expectancy.