Fasting blood glucose 6.4mmol/L is higher than the normal value of fasting blood glucose, but it does not reach the diagnostic standard of diabetes mellitus, and you need to check the blood glucose of 2 hours after meal and so on to further clarify the diagnosis. Fasting blood sugar 6.4mmol/L need to be adjusted from diet, exercise, medication and other ways to monitor blood sugar regularly. The normal range of fasting blood glucose should be between 3.9~6.1mmol/L. Fasting blood glucose 6.4mmol/L exceeds its normal range and belongs to hyperglycemia, but has not reached the standard of diabetes. Diabetes can only be diagnosed when fasting blood sugar is greater than or equal to 7.0mmol/L and there are symptoms of “three more and one less” (more food, more urine, more drink, weight loss). Fasting blood sugar 6.4mmol / L can be dietary adjustments, avoid eating high calorie, high sugar, high greasy food, pay attention to the diet of light, nutritious, you can eat less and more meals. Do moderate aerobic exercise every day, including running, swimming, jumping rope and so on. Fasting blood glucose 6.4mmol / L when you need to go to the hospital again for detailed examination, daily need to regularly test blood glucose, under the guidance of the doctor treatment.