Diabetic patients’ preprandial blood glucose, i.e. fasting blood glucose, has a normal range between 3.9 and 6.1 mmol/L; postprandial blood glucose generally refers to 2-hour postprandial blood glucose, and the normal range should be under 10 mmol/L. Diabetic patients should actively cooperate with doctors for treatment, including diet management, physical exercise, medication and so on. Diet should control the total calories of food, choose low-sugar, low-fat, low-salt, low-calorie food; exercise can choose jogging, swimming and other aerobic exercise; medication can follow the doctor’s instructions to use metformin, insulin and other treatments. Patients diagnosed with diabetes need to standardize their treatment to ensure that both fasting and 2-hour postprandial blood glucose are within the target range, which will help to prevent the occurrence of diabetic complications.