Angina pectoris is the most common type of coronary artery disease in clinical practice. It is a transient myocardial ischemia caused by a mismatch between the blood supply and oxygen consumption of the heart, and is commonly triggered by exertion, agitation, cold air inhalation, blood loss, anemia, hyperthyroidism, fever, and certain medications. Common causes include coronary atherosclerosis, aortic valve disorders, and myocardial hypertrophy. Atherosclerosis is the most common cause, and the general medical community refers to coronary angina simply as angina pectoris. It is caused by a significant narrowing of the heart vessels or a transient spasm of the coronary vessels based on the narrowing, resulting in insufficient blood supply and ischemia to the myocardium in the area supplied by the narrowed vessels at rest or during exercise, resulting in episodes of chest pain and other symptoms (pain, chest tightness, breath-holding, tightness in the chest, feeling of pressure by heavy objects, sweating, weakness, nausea, vomiting, and even fainting). The attack usually lasts no more than 15-30 minutes and can be relieved by itself. According to the pathological changes and clinical situation of angina, it can be divided into stable angina and unstable angina. Stable angina refers to the patient’s angina symptoms in the past 2-3 months is relatively constant, the attack mostly has a trigger, that is to say, angina at rest does not attack, is onset of exertion or emotional excitement, trigger angina attack activity intensity, attack symptoms, duration, attack frequency, etc. is relatively constant, these patients are relatively stable, generally within a short period of time not to occur adverse consequences; and Unstable angina refers to angina attacks without obvious triggers, or within the last 1-2 months, the intensity of activity triggering angina attacks has significantly decreased, the symptoms of attacks have worsened, the duration has increased, the attacks have become more frequent, and the accompanying symptoms have increased (such as sweating, nausea, vomiting, fainting, etc.), the condition of these patients is unstable, and most of them may have accidents within a short period of time (death, myocardial infarction, etc.). Myocardial infarction, etc.) within a short period of time. Therefore, according to the pathological changes and clinical manifestations of coronary angina, it is generally considered that the majority of patients with unstable angina and a minority of patients with stable angina need to undergo coronary angiography and stenting, and those with stable angina requiring treatment are mainly those with frequent or/and severe clinical symptoms during anginal episodes, poor results of regular drug therapy and those with evidence of a large blood supply from the diseased vessel (symptoms, signs, electrocardiogram, ultrasound, nuclear, coronary CT, coronary angiography, etc.).