Patients with a glycosylated hemoglobin of 5.9% and a fasting blood glucose of 7.7 mmol/L should consider the possibility of diabetes, and if diagnosed, treatment needs to be initiated. The normal range of glycosylated hemoglobin is 4%~6%, and the normal range of fasting blood glucose is 3.9~6.1mmol/L. Therefore, glycosylated hemoglobin of 5.9% and fasting blood glucose of 7.7mmol/L suggests that glycosylated hemoglobin is normal and fasting blood glucose is high; fasting blood glucose of more than 7mmol/L has already reached the diagnosis of diabetes mellitus as one of the glycemic criteria. However, only one fasting blood glucose elevation can not diagnose diabetes, but also need to be combined with glucose tolerance test and other test results and the presence of excessive drinking, polyphagia, polyuria, weight loss, and other diabetes-related clinical manifestations to make a comprehensive judgment, if the diagnosis of diabetes is confirmed, then you need to take metformin, gliclazide and other medications, or injections of insulin therapy. Glycated hemoglobin 5.9%, fasting blood glucose 7.7mmol / L situation, it is recommended under the guidance of a doctor treatment.