Postprandial blood glucose in normal people usually reaches its maximum around 0.5~1h after meal, and it will be prolonged in diabetic patients, and the clinic usually uses 2 hours postprandial blood glucose as the evaluation index. The so-called postprandial blood glucose refers to the blood glucose measured from the beginning of the meal, and the clinic generally uses 2 hours postprandial blood glucose as the evaluation index, and the normal is less than 7.8mmol/L. The postprandial blood glucose reflects the blood glucose level of the patient. Postprandial blood glucose reflects the ability of pancreatic islets to secrete, if the structure or function of pancreatic islets is damaged, it can be reflected in the abnormality of postprandial blood glucose, so pre-diabetic patients tend to have high postprandial blood glucose. The postprandial blood glucose peak of ordinary people will arrive at 0.5~1h, while that of diabetic patients will arrive at 1~2h or even later. It is recommended that patients with abnormal postprandial blood glucose go to a regular hospital in time and receive standardized treatment under the guidance of a doctor to avoid delays in their condition.