Blood glucose changes under different circumstances and its reference range is different, which is divided into fasting blood glucose, 1 hour after meal, 2 hours after meal and random blood glucose. For example, the normal range of fasting blood glucose is 3.9~6.1mmol/L. The normal range of fasting blood glucose for normal people is 3.9~6.1mmol/L. The normal value of 1 hour postprandial blood glucose is usually 6.7~9.4mmol/L, and up to 11.1mmo/L. The normal value of 2 hour postprandial blood glucose is less than 7.8mmol/L. Random blood glucose should be less than 11.1mmol/L. If the patient’s fasting blood glucose is greater than or equal to 7.0mmol/L and 2 hours after meal is greater than or equal to 11.1mmol/L, it is recommended to go to the regular hospital for blood glucose monitoring. Patients with high blood sugar are generally not advised to eat more fruits with high sugar content, and it is best to focus on roughage in daily diet, such as oatmeal and cereal. If the diagnosis of diabetes mellitus, should follow the doctor’s instructions to take hypoglycemic drugs, pay attention to the daily diet, should also pay attention to rest, to maintain blood sugar stability.