Diabetic patients with poor blood glucose management will suffer from a variety of acute and chronic complications, which will eventually bring great damage to the patient’s body. On the contrary, if blood glucose is managed properly, the risk of various complications will be reduced and the quality of life of patients will be improved. Acute complications include ketoacidosis, hyperosmolar coma, lactic acidosis, coma with hypoglycemia, and coma with hypoglycemia that can also result from improper control during treatment, which are acute complications in the diabetic population. Acute complications used to be very common, basically dealing with the acute complications of diabetes. At that time, there were few diabetic patients and not many professional teams, and patients were not well taken care of and educated, so there were many problems in this area. Of course, there are monitoring and treatment measures, but the level is relatively low. Poor long-term control of blood sugar, there will be chronic complications, these chronic complications once formed, the current level of medical care can hardly be reversed. Chronic complications include microvascular complications and macrovascular complications. Microvascular complications, such as fundus lesions can cause blindness, there is a kidney lesion, which can eventually lead to kidney failure, and some neuropathy. Neuropathy is complicated by peripheral neuropathy, which can feel numbness in the tips of the hands and toes and eventually loss of sensation. There are also vegetative neuropathy, which can affect the heartbeat, blood pressure, gastrointestinal function, urination and defecation, and these vegetative functions can also be harmed, which can affect the quality of life of patients to a great extent and even threaten their lives. There are also some macrovascular complications, such as cardiovascular complications, cerebrovascular complications, and peripheral vascular complications. And there are also some combined ones, including microvascular complications and macrovascular complications, which eventually lead to amputation of the diabetic foot and can also be disabling. Both acute and chronic complications are closely related to poor blood glucose management, especially microvascular complications, which are more closely related to blood glucose levels. There are other factors besides blood sugar in macrovascular complications, such as lipid problems, blood pressure problems, uric acid problems, obesity problems, and sedentary smoking, etc. Blood sugar is a major cause. Good control of blood sugar is a prerequisite, and with good control of blood sugar, these complications will be significantly reduced, especially acute complications, and with good management of blood sugar and proper monitoring, the chance of complications will be greatly reduced. In the long run, blood glucose control is not up to standard, and blood glucose fluctuation is relatively large, which will lead to some chronic complications, so now we put forward higher requirements for blood glucose control, and we have to do blood glucose management. Now the medical science even put forward a concept of intensive management, can manage the blood sugar smoothly, meet the standard, chronic complications will also gradually reduce.