The mortality rate of diabetic patients is about 5%. The common causes of death in diabetic patients are mainly acute cardiovascular diseases, such as heart attack and heart failure, and cerebrovascular diseases, such as cerebral hemorrhage and cerebral infarction. However, in type 1 diabetes, the most common cause of death is renal failure and uremia due to diabetic nephropathy. The combination of severe ketoacidosis, hyperosmolar coma, severe infection, sepsis, and infectious shock in diabetic patients is also an important cause of death in diabetic patients. Of course, the most critical way to reduce mortality in diabetic patients is to control blood glucose well.