The younger the patient with diabetes, the shorter the duration of the disease, the fewer complications, and the fewer comorbidities, the stricter the glycemic control should be. On the contrary, the older the patient is, the more complications, the more comorbidities, the higher risk of hypoglycemia and the shorter life expectancy, the more the range of blood glucose control needs to be appropriately relaxed. The general standard is less than 10 mmol/L after meal, and strict control of patients’ blood glucose value 2 hours after meal can be controlled at 6-8 mmol/L. Diabetes is a series of clinical symptoms caused by elevated blood glucose due to genetic factors and environmental factors. According to the current 2017 Chinese Diabetes Prevention and Control Guidelines, the 2-hour postprandial blood glucose should generally be controlled at less than 10 mmol/L. However, this value is not fixed, and the target of 2-hour postprandial blood glucose control needs to be defined according to each patient’s specific situation, also known as individualized treatment, depending most of all on the patient’s age and whether there are complications and whether there are some serious comorbidities, such as whether there is a combination of advanced tumor, cardiovascular disease, or whether there is frequent hypoglycemia. The normal postprandial 2-hour blood glucose value should be less than 7.8 mmol/L. Patients with diabetes need to control not only fasting blood glucose, but also postprandial blood glucose.