The blood sugar concentration 2 hours after meal should be less than 7.8 mmol/L. After food enters the body, it is absorbed and digested by the gastrointestinal tract, decomposed into various carbohydrates and water, and even some of them are directly converted into sugar and stored in the liver or other organs, which will affect the human blood sugar to some extent. High blood sugar level 2 hours after meal should be treated promptly in hospital. An oral glucose tolerance test or a blood draw for routine examination is performed to make a timely diagnosis of diabetes and provide targeted treatment. Lowering the postprandial blood glucose concentration can effectively improve the quality of life of patients. It can also prevent damage to the human gastrointestinal tract caused by high blood glucose and avoid various diabetic complications. The 2-hour postprandial blood glucose concentration can effectively monitor the efficacy of the medication taken by the individual, and appropriate adjustments should be made if necessary.