Diabetic patients with fasting blood glucose of 6.0mmol/L still need to take metformin treatment as prescribed by the doctor if there is no obvious adverse reaction. Metformin can increase the sensitivity of peripheral tissues to insulin, increase insulin-mediated glucose utilization, inhibit hepatic gluconeogenesis, reduce hepatic glucose output, and achieve the purpose of reducing fasting and postprandial glucose. Therefore, patients with diabetes can rely on taking metformin to achieve the purpose of blood sugar control, if the fasting blood sugar can be controlled at 6mmol/L after taking metformin treatment, still need to take oral metformin treatment, because once you stop taking the drug blood sugar may rise again. It should be noted that, after taking the drug may appear nausea, vomiting, diarrhea and other adverse reactions, if there are obvious adverse reactions can not tolerate the patient is recommended to stop under the guidance of a doctor, if there is no obvious adverse reactions should not be discontinued. Fasting blood sugar 6mmol / L diabetic patients should actively cooperate with the doctor’s treatment, should not blindly stop using the drug.