Fasting blood glucose 7.4 mmol per liter, if the recheck blood glucose is still more than 7.0 mmol per liter is considered to be diabetes mellitus, through active treatment of blood glucose to reach the standard, is not too serious; if the blood glucose for a long time to increase, caused by acute and chronic complications, is more serious. Normal fasting blood glucose should be between 3.9 and 6.1 mmol per liter, if the fasting blood glucose is more than 7.0 mmol per liter, and the review is still increased to consider diabetes. After diabetes is clearly defined, diet, exercise and drug hypoglycemic treatment is needed, and hypoglycemic drugs, such as metformin and acarbose, are selected according to the patient’s condition, and if the blood glucose control is up to the standard, then it is not too serious. It is more serious if the patient’s blood glucose increases for a long time, causing acute or chronic complications, such as diabetic ketoacidosis, diabetic peripheral neuropathy, diabetic retinopathy. Fasting blood glucose of 7.4 mmol per liter is recommended to be checked and treated under a doctor’s supervision.