A three-hour postprandial blood glucose of 6.3 mmol/L can generally be considered normal. It is recommended to monitor fasting blood glucose and two-hour postprandial blood glucose, which is more conducive to the assessment of the condition and timely adjustment of the treatment program. Three-hour postprandial blood glucose can be regarded as random blood glucose, 6.3mmol/L is normal. For diabetic patients, the goal of glycemic control is generally non-fasting blood glucose does not exceed 10.0 mmol / L, so three hours after the meal blood glucose 6.3 mmol / L belongs to the glycemic control standard, but also according to the individual situation of the development of glycemic control goals, especially for the elderly or patients with serious concomitant disease, blood glucose should not be too low, to prevent the occurrence of hypoglycemic reaction. In case of abnormal blood glucose, it is recommended to consult a doctor in a timely manner, have regular checkups, and conduct self-monitoring of blood glucose at home.