If the 2-hour postprandial blood glucose is 8.4mmol/L, the patient can first control it through dietary adjustments, exercise, etc., and does not need to use medication for the time being; if the fasting blood glucose is 8.4mmol/L, then it is necessary to use hypoglycemic drugs as prescribed by the doctor to treat it. Normal fasting blood glucose ranges from 3.9 to 6.1 mmol/L, and two-hour postprandial blood glucose <7.8 mmol/L. Blood glucose 8.4 mmol/L is higher than the normal range for both fasting and postprandial blood glucose. Patients who are accompanied by three more and one less symptoms, such as polyuria, polydipsia, polyphagia and weight loss, are likely to be diabetic, and must be actively treated at this time. 1. 8.4mmol/L 2 hours after meal: patients should pay attention to the control of staple food in the diet, it is recommended to eat coarse grains instead of fine grains, stir-frying should be less oil, less salt, and usually avoid high oil and high sugar food. Usually strengthen exercise, exercise can consume calories, but also can enhance insulin sensitivity. 2. Fasting blood glucose 8.4mmol/L: If the fasting blood glucose 8.4mmol/L, need to be alert to whether there is diabetes, it is recommended to use hypoglycemic drugs under the guidance of a professional physician, such as metformin tablets, acarbose tablets, saxagliptin tablets and other treatments, and if necessary, can be injected with insulin to lower blood glucose. If there are stress factors, such as surgery, infection, etc., when patients test their blood glucose, it is recommended to review the test on a later date after the stress factors are removed. Patients with abnormal blood glucose values are advised to seek medical attention in time and not to use medication on their own.