Heart disease, as one of the three main factors causing human death, has long attracted great attention. In developed countries, coronary heart disease is one of the common diseases among adults over 50 years old and is also a major condition in the category of heart disease. In China, with the continuous improvement of living standards, the incidence of coronary heart disease is also increasing year by year. Coronary heart disease is the abbreviation of coronary atherosclerotic heart disease. It is part of the systemic atherosclerotic disease, a disease that involves the arteries of the heart and causes serious consequences and teaches a high rate of morbidity and mortality. Age and other combined factors cause the originally soft and elastic blood vessels to harden and form what we usually call atheromatous plaques. The increased plaques restrict blood flow through the coronary vessels, causing myocardial ischemia, and if blood flow is completely interrupted, myocardial infarction occurs. There are 5 types of myocardial ischemia as follows: 1, asymptomatic myocardial ischemia. 2. Angina pectoris. Angina is a clinical syndrome caused by insufficient coronary artery blood supply and acute, temporary ischemia and hypoxia of the myocardium. It is characterized by paroxysmal anterior chest crushing pain sensation, mainly located in the posterior sternum, can radiate to the precordial area and the left upper limb, often occurs during labor or emotional excitement, lasts for several minutes, disappears after rest or with nitrate preparations. This disease is mostly seen in men, and most patients are over 40 years old. 3, Myocardial infarction. 4, Ischemic cardiomyopathy. 5.Sudden death.