Diabetic patients 2 hours after meal blood glucose 7.9mmol / L, the next day fasting blood glucose bias is not high difficult to judge, individual differences are large, it is recommended that daily regular monitoring of blood glucose. 1. High fasting blood glucose the next day: diabetic patients with 2-hour postprandial blood glucose 7.9mmol/L, belonging to the glycemic control standard, but may be due to the dawn phenomenon, the Sumuj reaction and other reasons lead to the next day of fasting blood glucose is high. 2. Normal fasting blood glucose on the next day: diabetic patients with postprandial blood glucose control may also have normal fasting blood glucose. 3. Decreased fasting blood glucose on the next day: this usually occurs when the dose of hypoglycemic drugs or insulin is too large. Diabetic patients should dynamically monitor the change of blood glucose level, under the guidance of the doctor for treatment.