Cardiovascular disease is one of the common chronic complications of diabetes mellitus. Cardiovascular diseases combined with diabetes mainly include coronary heart disease, cardiomyopathy, cardiac autonomic neuropathy, etc. These diseases are important causes of disability and death in diabetic patients, among which coronary heart disease in particular is more common and more serious. Therefore, it is crucial for diabetic patients to prevent and delay the occurrence and development of cardiovascular diseases, especially coronary heart disease. Coronary heart disease is a disease in which atherosclerotic plaques occur in the coronary arteries, the blood vessels responsible for feeding the heart, resulting in coronary artery rupture and bleeding or thrombosis, causing heart ischemia or even necrosis. Generally speaking, the typical symptoms of coronary artery disease are pressure-like pain behind the sternum, or a feeling of tightness or heaviness. Diabetic patients suffering from coronary heart disease is first of all “high incidence and low age”, the incidence of coronary heart disease in diabetic patients is very high, more than 70% of diabetic patients will be complicated by coronary heart disease, while the onset of cardiovascular disease in diabetic patients earlier than non-diabetic patients; secondly, “gender equality “However, after diabetes, the cardiovascular protection of women disappears, and the chance of cardiovascular disease in women increases greatly and is no less than that in men; finally, it is “atypical”, because diabetic patients often have combined neuropathy, pain and dullness. More than 1/3 of patients do not have the typical manifestation of chest pain during an acute attack, so it is not easy to associate them with coronary heart disease, thus delaying the disease.