A normal person should have a 2-hour blood sugar of less than 7.8 mmol/L for a glucose tolerance test. If the test blood sugar is between 7.8 mmol/L and 11.1 mmol/L, it can be diagnosed as abnormal glucose tolerance, also called pre-diabetes. If the blood sugar exceeds 11.1 mmol/L, combined with symptoms of diabetes, such as excessive drinking, excessive eating, excessive urination and weight loss, diabetes can be diagnosed. Glucose tolerance, or oral glucose tolerance test, is currently a gold standard test to confirm the diagnosis of diabetes. This is done by dissolving 82.5g of glucose powder in 250-300ml of warm water and the patient drinks it within 5 minutes. The intravenous glucose is measured once on an empty stomach, and the blood glucose value is measured 1 hour, 2 hours and 3 hours after drinking the glucose water to clarify whether the patient is diabetic according to the blood glucose result. In normal people, glucose tolerance 2 hours blood sugar is less than 7.8mmol/L. If the blood sugar is above 11.1mmol/L at this time, combined with the symptoms, diabetes can be diagnosed. Patients with high glucose tolerance 2-hour blood glucose but less than the diagnostic standard of diabetes should pay attention to diet control, exercise appropriately, eat more coarse food, eat less sweet food and fruits with high sugar content, and not eat too fine food.