Diabetes mellitus patients with fasting blood glucose 13.8mmol / L, obviously more than the fasting blood glucose control target range, can be regulated by diet, exercise and hypoglycemic drugs. 1. Dietary control: daily energy intake should be strictly controlled, diet should be balanced, avoid greasy, high-salt and high-sugar foods, eat more high-fiber foods, eat more coarse grains, and avoid overeating. 2. Scientific exercise: regular exercise can improve insulin sensitivity. It is recommended to have no less than 150 minutes of aerobic exercise per week, including swimming, jogging, fast walking and cycling. 3. Medications: Glucose-lowering medications include metformin, acarbose, insulin, etc. Medications should be used under the guidance of a doctor. Lowering blood sugar in diabetes is a long-term process, and you should monitor your blood sugar regularly and treat it under the guidance of your doctor.