Glucose tolerance generally refers to the glucose tolerance test, if the glucose tolerance test three hours of high blood sugar can be treated through diet control, physical exercise and medication. Fasting blood glucose and 2-hour postprandial blood glucose are more commonly used for clinical assessment. Glucose tolerance test three-hour blood glucose normal 3.9-6.0 mmol / L, which can be regarded as random blood glucose, ≥ 11.1 mmol / L with diabetic symptoms can be diagnosed as diabetes mellitus. If it is high but does not meet the diagnostic criteria for diabetes mellitus, it can be controlled by diet, low-sugar, low-salt, low-fat diet, limiting the total daily energy intake, with exercise to reduce blood glucose. If the diagnosis of diabetes mellitus is confirmed, the patient needs to be treated with medication based on diet and exercise control, oral hypoglycemic drugs including acarbose, metformin, etc., or insulin injection. Patients with elevated glucose at the three-hour glucose tolerance test are advised to seek medical attention.