The 3-hour postprandial blood glucose 6.6mmol/L should be combined with fasting blood glucose, 2-hour postprandial blood glucose, etc. If the diabetes standard is reached, medication, diet and exercise treatment are needed; if the diabetes standard is not reached, diet and exercise can be used to control it, and blood glucose can be monitored regularly. Postprandial 3-hour blood glucose will generally return to the level of fasting blood glucose, i.e., 3.9-6.1 mmol/L, so postprandial 3-hour blood glucose 6.6 mmol/L is high, postprandial 3-hour blood glucose is not a diagnostic criterion for diabetes mellitus, and it should be perfected to understand the presence or absence of diabetes mellitus and pancreatic islet function, such as fasting glucose, postprandial 2-hour blood glucose, glycosylated hemoglobin, glucose tolerance test, and so on. If fasting blood glucose ≥ 7.0mmol / L or 2 hours after meal blood glucose ≥ 11.1mmol / L combined with polyuria, polydipsia, polyphagia, weight loss symptoms, can be considered diabetes mellitus, should be treated with drug therapy combined with diet, exercise therapy, medication, including metformin, glimepiride, acarbose, etc.; does not reach the standard of diabetes mellitus can be controlled by diet, exercise, regular monitoring of blood glucose. Abnormal blood glucose patients, it is recommended that they should go to the hospital, under the guidance of the doctor treatment.