Many diabetic patients who are preparing for surgery are not very clear about how much blood sugar control is appropriate, so they are torn. Therefore, it is necessary to understand the control standard of blood glucose in the perioperative period and take surgery treatment after the blood glucose control reaches the standard. 1.Ordinary major and minor surgery: fasting blood sugar 8-10 mmol/L, blood sugar level 8-12 mmol/L at any point 2 hours after meal or when you cannot eat, HbA1C<8.5%. Surgery can be considered. 2.Emergency surgery: random blood sugar <14 mmol/L. Surgery can be considered. 3.Fine surgery (such as plastic surgery, eye surgery, etc.): fasting blood glucose 4.4-6.0 mmol/L, blood glucose level 6-8 mmol/L at any point 2 hours after meal or when unable to eat. surgery can be considered. 4. Postpone non-emergency surgery: fasting blood glucose >10 mmol/L, random blood glucose >14 mmol/L, glycated hemoglobin <9%. Surgery can be considered. 5. Those who are contraindicated to surgery: If diabetes combined with ketoacidosis or hyperosmolar coma, the contending complications need to be dealt with as soon as possible, and surgery should be prohibited in this time period. If oral medication cannot effectively achieve the control goal, insulin pump control needs to be considered.