The main danger of diabetes is the complications caused by hyperglycemia, which can lead to disability, even loss of work capacity or death. Relevant information shows that before insulin and antibiotics were used in clinical practice, diabetic ketoacidosis, hyperosmolar coma and co-infection were the main causes of death in diabetic patients. With the rapid development of medical science, insulin, antibiotics, oral hypoglycemic drugs and traditional Chinese medicine have been widely used in clinical practice, and the survival rate and quality of life of diabetic patients have been greatly improved. However, the critical cause of death in diabetes mellitus is renal failure, and diabetic coma is still one of the main causes of death. More than 70% of diabetic patients die from complications and concomitant diseases of the cardiovascular system. Diabetic patients have 2-3 times higher cardiovascular morbidity and mortality than non-diabetic patients, and heart disease occurs earlier and develops faster in female diabetic patients. World Health Organization experts on diabetes found that: the incidence of diabetic nephropathy increased in the past, the course of the disease in more than 20 years of type 1 diabetic patients have 50-80% die from uremia; diabetes caused by blindness than the average person 10-23 times; diabetic jaundice and amputation than the average person 20 times, the current rate of death caused by diabetes, second only to cardiovascular, cerebrovascular and tumor diseases and The death rate caused by diabetes is the highest after cardiovascular, cerebrovascular and tumor diseases. Among middle-aged and elderly diabetic patients, cardiovascular complications are the main fatal factor. In young patients, the main causes of death are ketoacidosis and infection.