The normal value of postprandial 2-hour blood sugar is less than 7.8mmol/L, so it is said that 6.5mmol/L of postprandial 2-hour blood sugar belongs to the normal range. If the patient belongs to the high-risk group, such as having family history of diabetes, obesity, hyperlipidemia, hypertension, cardiovascular and cerebrovascular diseases or age more than 40 years old, he/she needs to review fasting blood sugar and postprandial blood sugar regularly. At the same time, pay attention to a light diet, mainly low salt, low fat, low sugar, avoid tobacco, alcohol, carbonated beverages, drink more plain water, chrysanthemum tea, bitter tea. Actively treat the original disease, increase the amount of exercise, develop good habits, do not stay up late, ensure sufficient sleep, keep a calm mind, and keep the bowel movement smooth.