Normal 2-hour postprandial blood glucose should be less than 7.8mmol/L, so when the fasting blood glucose is normal and the 2-hour postprandial blood glucose is 15mmol/L, it is necessary to treat. Diabetes can be diagnosed when the 2-hour postprandial blood glucose is ≥11.1mmol/L and there are clinical manifestations of “three more and one less”. Therefore, if the 2-hour postprandial blood glucose value is 15mmol/L, and if the patient is accompanied by diabetes symptoms such as dry mouth, drinking, urination, weight loss, etc., then the diagnosis of diabetes can be made. Patients diagnosed with diabetes need treatment, including dietary control, appropriate exercise, oral hypoglycemic drugs, insulin injections and so on. Adhere to a low-sugar, low-salt, low-fat diet, regular exercise, weight control, oral hypoglycemic drugs such as metformin hydrochloride tablets, glimepiride, etc., under the guidance of a doctor, and insulin injection to lower blood sugar if necessary. It is recommended that the patient should seek medical advice in time to improve the relevant examinations and standardize the treatment.