Fasting blood glucose 8.9mmol/L, if there are also symptoms such as polyuria, polydipsia, polyphagia, weight loss, etc., can be considered diabetes mellitus, and should be applied medication, including metformin, insulin, etc., and combined with dietary and exercise therapies to lower glucose. If it is a transient elevation of blood glucose caused by stress, generally do not need hypoglycemic treatment. Fasting blood glucose 8.9mmol/L (≥7.0mmol/L), if there are also symptoms of polyuria, polydipsia, polyphagia, weight loss, can be considered to have diabetes mellitus, and should be drugs combined with diet and exercise therapy, drugs including metformin, insulin, acarbose and so on. However, if the stress state, such as major surgery, trauma, severe infection, due to sympathetic nerve excitation, adrenocorticotropic hormone and other glucagon secretion increases, can lead to a transient increase in blood glucose, there can be a fasting blood glucose 8.9mmol / L, general stress factors removed, fasting blood glucose can be reduced to normal, usually do not need glucose-lowering treatment. Fasting blood glucose 8.9mmol/L should go to the hospital, under the guidance of the doctor’s treatment.