Diabetic patients with blood glucose 10 mmol / L or more either fasting or non-fasting blood glucose are high, more serious, diabetic patients with long-term poor glycemic control may lead to a variety of acute and chronic complications such as ketoacidosis, diabetic nephropathy, diabetic neuropathy, coronary artery disease and so on. Generally speaking, type 1 and type 2 diabetic patients are recommended to control fasting blood glucose level at about 4.4~7.0 mmol/L, and the non-fasting blood glucose target is <10.0 mmol/L, which is a more reasonable range. The specific blood glucose range needs to be changed according to the patient’s age, disease duration, complications, severity of the disease and so on. Diabetic patients with blood glucose of 10 mmol/L are advised to consult a doctor in time to formulate an individualized glucose-lowering plan under the guidance of a specialist.