Fasting blood glucose 7.1mmol/L postprandial blood glucose 9.4mmol/L two indicators can not diagnose diabetes mellitus, the diagnosis of diabetes mellitus need to refer to the symptoms and blood glucose values to consider, or other day to review blood glucose in order to clarify the diagnosis. The diagnostic criteria for diabetes include: typical symptoms of diabetes (excessive drinking, excessive eating, excessive urination, unexplained weight loss, etc.) plus random blood glucose ≥ 11.1mmol/L, or fasting blood glucose ≥ 7.0mmol/L, or oral glucose tolerance test 2-hour blood glucose ≥ 11.1mmol/L. Diabetes can be diagnosed when one of these criteria is met, and if there are no symptoms of diabetes, the patient needs to be rechecked on another day. Definitive diagnosis. In the absence of the typical symptoms of diabetes mellitus, it is not possible to diagnose diabetes mellitus by merely referring to the fasting blood glucose of 7.1 mmol/L and the postprandial blood glucose of 9.4 mmol/L. It is recommended that the test be repeated on another day to make a clear diagnosis. Lifestyle interventions, such as a low sugar, high fiber diet with appropriate exercise and a happy mood, can be performed when high blood sugar is detected. In addition, diabetes symptoms such as itchy, dry skin, ulcers that do not heal, numbness and tingling in the limbs, and a lack of mental clarity should also be taken seriously. When the above symptoms should be timely consultation, can do glucose tolerance test and glycated hemoglobin test, etc., after a clear diagnosis under the guidance of the doctor to standardize the application of hypoglycemic drugs.