The blood glucose criteria of diabetes mellitus are mainly diagnostic criteria and control criteria. The diagnostic criteria of diabetes mellitus are mainly the following three, and diabetes mellitus can be diagnosed by meeting one of them: i. The typical three symptoms of diabetes mellitus (drinking more, eating more, urinating more and losing weight), plus fasting intravenous blood glucose ≥ 7.0mmol/L. ii. The typical three symptoms of diabetes mellitus, plus random intravenous blood glucose ≥ 11.1mmol/L. Random intravenous blood glucose, is regardless of the last meal meal time. Third, the typical symptoms of diabetes, plus the oral glucose tolerance test 2 hours after meals blood glucose ≥ 11.1mmol/L. If there is no typical symptoms of diabetes, it must be re-examined 1 more time and reviewed before diagnosis. The control standard of diabetes is fasting blood sugar between 4.4-7.2mmol/L and non-fasting blood sugar <10.0mmol/L or less.