The American Endocrine Society has released updated guidelines for the diagnosis and treatment of hyperglycemia, suggesting that blood glucose must be checked whenever a patient is hospitalized, whether they are critically ill or generally hospitalized, regardless of whether they have been previously diagnosed with diabetes. This is because hyperglycemia can prolong hospitalization days, increase the chance of infection, and increase mortality. The specific recommendations of the association include the following: 1. Pre-meal blood glucose should be controlled below 140mg/dl (7, 78mmol/L), and random blood glucose including post-meal blood glucose is generally controlled below 180mg/dl (10mmol/L). This is the requirement for most of the non-critical inpatients. 2. For diabetic patients who inject insulin at home during hospitalization, they must also inject insulin according to the plan. 3. For all type 1 diabetic patients and most type 2 diabetic patients who need surgery during hospitalization, insulin therapy should be given, either by continuous intravenous infusion of insulin therapy or by subcutaneous injection of long-acting basal insulin therapy and, if necessary, by preprandial short-acting insulin according to the postprandial blood glucose situation. Perioperative (including preoperative and postoperative) insulin therapy is mainly for the prevention of hyperglycemia. 4.If hyperglycemia is found on admission examination, regardless of previous history of diabetes, patients should do bedside monitoring of gross blood glucose as long as they are nourished by intravenous nutrition or nasal feeding. 5.All type 1 and type 2 diabetic patients who want to stop intravenous insulin infusion therapy should be given subcutaneous insulin therapy as planned at least 1-2 hours before that to maintain blood glucose stability.