Generally speaking, fasting blood glucose from 9.8 to 8.4mmol/L has reached the diagnostic standard of diabetes mellitus, if diagnosed as diabetes mellitus is generally required to take medication. Under normal circumstances, the reference value of fasting blood glucose is about 3.9~6.1mmol/L. If the patient’s blood glucose drops from 9.8mmol/L to 8.4mmol/L, then it means that the patient’s body glucose level exceeds the standard, which may be related to diabetes, and he or she needs to go to the hospital in time to have a checkup, so as to make a definite diagnosis of the disease. If the patient’s fasting blood glucose ≥ 7.0mmol / L, the presence of typical symptoms of diabetes, or non-same day two fasting blood glucose ≥ 7.0mmol / L, considering the presence of diabetes, then we should promptly take some suitable hypoglycemic drugs under the guidance of the doctor, such as metformin hydrochloride tablets and so on. In addition to actively cooperating with the doctor’s treatment, patients should also pay attention to regular blood glucose checkups in the hospital, and maintain healthy living and dietary habits, take more rest, eat more fresh vegetables, and keep a good state of mind, so as to avoid abnormal fluctuations in blood glucose.