The normal value is less than 7.8 mmol/L. If it exceeds the normal value, there is a certain risk, which indicates that there is a problem of blood sugar metabolism. When the blood sugar of 2 hours after meal is 7.8-11.1mmol/L, it can be diagnosed as hypoglycemic tolerance, which is the transition state of normal people to diabetes, and the risk of diabetes in the future is very high, so it should be highly alert; if the blood sugar of 2 hours after meal is ≥11.1mmol/L, it can be diagnosed as diabetes, and it needs to actively carry out diabetes education, medical nutrition treatment, exercise treatment, condition monitoring and It is necessary to actively carry out diabetes education, medical nutrition therapy, exercise therapy, condition monitoring and drug therapy to control blood sugar, prevent serious metabolic disorders, and prevent and delay the occurrence and development of chronic complications of diabetes. Diabetic patients who have been diagnosed, if they are relatively young and have fewer diabetic complications, should strictly control their blood glucose. Generally, postprandial blood glucose needs to be controlled below 10 mmol/L, and strictly controlled blood glucose needs to be below 8 mmol/L. The occurrence and development of diabetes can be effectively prevented or delayed by appropriate lifestyle interventions such as reasonable diet, appropriate exercise and weight control in people with high risk of diabetes.