1, diabetic patients should understand their condition before surgery to maintain a calm state of mind and appropriate activities to keep blood sugar stable, which is very beneficial to surgery. 2, the doctor should understand the patient’s condition before the day should understand the patient’s diabetes is type 1 or type 2, in addition to determine the general surgical risk factors, but also should correctly grasp the functional status of the main organs caused by diabetes comorbidities and the degree of damage. Pre-operative diabetic patients should receive a comprehensive examination, including blood glucose, urine glucose, ketone bodies, glycosylated hemoglobin, electrolytes and lipid determination, etc. Cardiac, liver and kidney function tests should be performed. 3. Pre-operative diabetic patients’ blood glucose should be controlled at the ideal state at least 3 days before surgery in the hospital to monitor blood glucose. For light diabetes mellitus that can be controlled by diet or oral hypoglycemic drugs, and those who can eat normally soon after surgery, it is more appropriate to control blood sugar at 8,3mmol/L before surgery, and no special treatment is needed; those who need oral hypoglycemic drugs or combined organ damage should switch to short-acting insulin 3 days before surgery, and adjust the dose, and generally require fasting blood sugar at 7,2-8,9mmol/L before surgery. -4. Pre-operative diabetic patients’ diet should be adjusted appropriately. i. Increase the proportion of protein appropriately, so that it accounts for 20% of the total calories. ii. Second, the proportion of carbohydrates to total calories should be controlled at 45%-60%, with at least 250 grams-300 grams of daily intake in order to have adequate preparation of liver sugar; Third, supplement fat, but its intake should not exceed 25% of total calories; Fourth, pay attention to supplement vitamins, vitamin B, vitamin C, etc. can improve the body’s Healing ability, improve coagulation function is very helpful; five, high fiber food crystal is very important to slow down the absorption of sugar. What to pay attention to during surgery for diabetic patients Check fasting blood sugar, urine sugar and urine ketone body before the surgery day. Fasting on the day of surgery, indwelling urinary catheter in order to avoid starvation ketone body, first supplemented with 50 grams of sugar. Intraoperative supplementation of additional ordinary insulin 1 unit; intraoperative monitoring of blood glucose and urine glucose every 2 hours and adjusting insulin dosage at any time; avoid hypoglycemia during surgery, as it can cause wound overflow.