Fasting blood glucose 16mmol / L, belongs to the high blood sugar, it is recommended to go to the regular hospital in time, according to the doctor’s guidance to see if you need to further glucose tolerance test, a clear diagnosis and then carry out the appropriate treatment. The diagnostic criteria for diabetes mellitus, i.e., fasting blood glucose ≥7.0mmol/L, 2-hour postprandial blood glucose ≥11.1mmol/L, and random blood glucose ≥11.1mmol/L, should be considered in combination with the relevant clinical symptoms, such as polydrinking, polyphagia, polyuria, and weight loss, etc. If stress conditions are excluded, it is recommended to go to a regular hospital to see if further glucose tolerance test is needed before appropriate treatment. If we exclude the elevation of blood glucose caused by stressful situations, the patient is clearly diagnosed with diabetes mellitus, which generally needs to be treated. It can be treated with long-term insulin injection, oral metformin, glimepiride and other hypoglycemic drugs as prescribed by the doctor, and at the same time choosing a low-salt, low-sugar, low-fat diet, together with moderate physical and functional exercise, which can effectively reduce blood glucose. If abnormal blood glucose is found, it is recommended to go to the hospital in time to avoid delaying the condition.