Diabetic patients should follow the “REACH” principle in the treatment, specifically: R (Risk factors management): comprehensive management of blood glucose, comprehensive intervention of cardiovascular disease risk factors such as hypertension, lipid metabolism disorders, obesity, etc. E (Eary intervention): Early glycemic intervention. For newly diagnosed diabetic patients, early and active treatment is emphasized to control blood glucose up to the standard, which is important to protect the function of pancreatic islet cells and delay the emergence of complications. A (All sides glucose control): Emphasize the all-round achievement of blood glucose standard, i.e. fasting blood glucose, postprandial blood glucose and glycated hemoglobin all achieve the standard, and the index is stable for a long time. C (Combination rationally): Reasonable combination of drugs. It is advocated to carry out reasonable combination therapy at an early stage to achieve the effect of complementing the shortcomings. H(Hypoglycemia): Prevention of hypoglycemia. The blood glucose standard should be achieved on the premise of safety, and avoid hypoglycemia due to excessive emphasis on glycosylated hemoglobin standard and overly strict blood glucose control.