A normal person’s 2-hour postprandial blood glucose should be less than 7.8 mmol/L. A 2-hour postprandial blood glucose of 7 to 9 mmol/L may be abnormal or normal, depending on the exact value. Normal venous blood glucose range is: fasting blood glucose in 3.9~6.1mmol/L, at the same time in the sugar load after 2 hours of blood glucose is less than 7.8mmol/L. Fasting blood glucose is impaired when it is 6.1 to 7.0 mmol/L with a 2-hour post glycemic load glucose less than 7.8 mmol/L. When fasting blood glucose is less than 7.0 mmol/L and 2-hour post glycemic load blood glucose is 7.8 to 11.1 mmol/L, it is impaired glucose tolerance. Diabetes can be diagnosed if the 2-hour postprandial blood glucose is greater than or equal to 11.1 mmol/L, combined with diabetes-related symptoms such as polydipsia, polyphagia, polyuria, and weight loss. Simple postprandial blood glucose is 7~9mmol/L, if it is standard 2 hours postprandial blood glucose, it should be analyzed according to the specific blood glucose value, and it is recommended to consult a doctor in time, and improve the glucose tolerance test under the doctor’s guidance, so as to make a clear diagnosis and standardize the treatment.