Postprandial blood glucose is the blood glucose value measured 2 hours after a meal. Generally, the normal range of blood glucose 2h after meal for normal people is between 4.4-7.8 mmol/L. Therefore, 2h postprandial blood glucose of 6.3mmol/L mostly belongs to the normal state. If the patient is an ordinary person or a young diabetic, it can be seen that the blood glucose is well controlled, but if the patient is an old diabetic, it is necessary to raise vigilance. 1. Ordinary people: Patients who do not have diabetes, if the 2h postprandial blood glucose 6.3mmol/L, while the fasting blood glucose is 3.9-6.1mmol/L, it indicates that the patient does not have abnormal glucose metabolism at present, and can follow the normal diet . However, we should pay attention to control our weight, because patients with high weight or already obese are prone to type 2 diabetes, especially those who are over 40 years old and have had hypertension, hyperuricemia and hyperlipidemia. 2. Young diabetic patients: If the diabetic patients are younger, have fewer complications, no diabetic nephropathy, diabetic macroangiopathy, and no cerebral hemorrhage or If a diabetic patient is young, has no complications such as diabetic nephropathy, diabetic macrovascular disease, cerebral hemorrhage, cerebral thrombosis, etc., and has 2h postprandial blood glucose control at 6.3mmol/L, fasting blood glucose control at 6.0-7.0mmol/L, and glycated hemoglobin control at about 6.3%, it belongs to the state of diabetes control. Whether the patient is treated with diet control, exercise or diet, exercise plus hypoglycemic drugs together, so that the postprandial blood glucose can reach 6.3mmol/L, it indicates that the patient’s current blood glucose control has basically reached the standard, and the treatment plan is practical and feasible, and can continue to adhere to it. Diet therapy for diabetic patients is the foundation, other treatments are all functioning on the basis of diet therapy, patients should persist; 3. Elderly diabetic patients: If diabetic patients are over 70 years old and have many cardiovascular and cerebrovascular diseases, 2h postprandial blood sugar is not recommended to be controlled at 6.3mmol/L, which is a low state, it is better to control at 8.0-9.0mmol/L, which is safer to avoid hypoglycemia. It is safer to avoid hypoglycemia. Because of the patient’s age and poor self-care ability, in if there is no one at home, if the blood sugar drops rapidly and cannot be relieved, it is easy to endanger the patient’s life.