Diabetic complications consist of two main types: acute complications of diabetes and chronic complications. The former includes diabetic ketoacidosis, diabetic non-ketotic hyperosmolar coma and lactic acidosis, which cannot be corrected by the patient himself and can cause death if not treated promptly. Long-term hyperglycemia and the hyperlipidemia and hypertension that often accompany diabetes can cause serious damage to many important organs throughout the body and produce chronic complications, which greatly reduce the patient’s quality of life and even endanger his or her life. Cardiovascular disease is the most important chronic complication of type 2 diabetes and the main cause of death in diabetic patients. 2-4 times more cardiovascular events occur in type 2 diabetic patients than in non-diabetic patients, characterized by a younger age of onset, faster progression of disease, and atypical symptoms such as chest pain and tightness, which are easily ignored and have serious consequences. According to statistics, 58% of type 2 diabetic patients die from cardiovascular disease. When atherosclerotic lesions develop, it not only affects the coronary arteries, it also affects other arteries in the body. When the cerebral arteries are involved, it will lead to stroke; in the reproductive system, male patients will experience impotence and female patients will experience vaginal dryness; in the lower extremities, it will lead to peripheral vasculopathy in the lower extremities, which will cause pain in the lower extremities and in severe cases, it may lead to amputation of the lower extremities. In addition to the above macrovascular complications, there are also small vascular complications of diabetes, such as diabetic renal complications, diabetic neurological complications, diabetic eye complications, which can produce renal insufficiency (serious development of uremia), limb sensory impairment and pain, blindness and other consequences. From the above it can be seen that hyperglycemia itself is not terrible, what is terrible is the generation of its complications. Prevention of diabetes, strict control of blood sugar is to reduce the occurrence of the above-mentioned complications, to minimize the pain, disability and death brought to patients by these complications, and also to minimize the economic burden on society and patients’ families, and to improve the quality of life of patients and their families.