Fasting blood glucose 9 to 10 that is, fasting blood glucose 9 to 10 mmol/L, diabetic patients who do not actively control their blood glucose to the target range may cause diabetic complications or easy to combine with infectious diseases. 1. Complications of diabetes mellitus: diabetes mellitus is a group of lifelong metabolic diseases characterized by chronic hyperglycemia caused by multiple etiologies. Long-term blood sugar increase, macrovascular and microvascular damage and endanger the heart, brain, kidney, peripheral nerves, eyes, feet and so on. More than half of diabetes deaths are caused by cardiovascular and cerebrovascular diseases, and 10% are caused by nephropathy. 2. Easily combined with infectious diseases: diabetic patients with long-term poor glycemic control is easy to combine with a variety of infectious diseases, diabetes complication of infections of clinical types, to the lungs and upper respiratory tract infections are the most common, followed by urinary tract infections, biliary tract infections, skin infections, tuberculosis and so on. Diabetic patients with fasting blood glucose 9~10mmol/L, it is recommended to go to the hospital in time to improve the examination of diabetes and complications, to carry out standardized treatment, and to control the blood glucose in the ideal range.