Fasting blood glucose 6.39mmol/L, belongs to the high blood glucose, it is recommended to improve the glucose tolerance test, monitor the postprandial blood glucose, pay attention to the daily diet. The normal value of fasting blood glucose is 3.9-6.1mmol/L, fasting blood glucose 6.39mmol/L is high, need to exclude infection, stress and other factors lead to temporary elevation of blood glucose, can be repeated retesting of blood glucose, such as is still high, it is recommended that the patient consult a doctor in a timely manner, improve the glucose tolerance test and other tests. Fasting blood sugar 6.39mmol / L people, but also need to monitor the postprandial blood sugar, normal people two hours after the meal blood sugar does not exceed 7.8mmol / L. Elevated blood glucose people, weekdays should be dietary and exercise therapy, reduce the intake of total calories, eat less high-calorie, high-sugar, high-fat food, adhere to aerobic exercise. Elevated fasting blood glucose, need to be examined and treated under the guidance of a doctor.