Urine glucose was the most important screening tool in the early years. However, with the advancement of medical research, it has been found that the leakage and misdiagnosis rates of urine sugar are high, so this this method is no longer a first-line screening tool. I. There are currently three main screening methods: 1. urine sugar This was the most important screening tool in the early years. However, with the advancement of medical research, it was found that the rate of leakage and misdiagnosis of urine glucose is very high, so this method is no longer the first-line screening method. 2, intravenous blood glucose This is the most recognized and recommended screening method. A small amount of venous blood is drawn in the morning when fasting, or at a random moment after a certain meal, and the grape concentration in the blood is tested, which is medically known as “fasting intravenous glucose (FPG)” and “postprandial intravenous (random) glucose (PPG)” respectively. 3.Finger blood glucose is similar to intravenous blood glucose test, except that finger blood is taken instead. The advantage is that the results can be obtained within seconds to a minute. However, due to accuracy and other reasons, it is mainly used in mass population screening. in order to improve efficiency; it is not the preferred screening tool for individuals. In addition, glycosylated hemoglobin (HbAlc) or glucosamine is also recommended by some scholars as a screening tool, but it is not considered to be able to take up the screening role on its own, as it requires concurrent FPG or PPG tests, and the cost is relatively high. Blood 1.5-anhydroglucitol (1,5-AG) is not affected by food, age and gender, and can be used as a screening indicator for diabetes, but it is not yet universally accepted and has not yet been performed. Second, the criteria for screening diabetes “positive” intravenous glucose is not completely unified, the relatively common opinion is: FPG ≥ 6.1mmol/l, PPG ≥ 7.2mmol/L (meet one can), urine sugar “±” or “+” or “++” or “++++”, collectively referred to as positive urine glucose. The criteria for positive intravenous glucose are not completely unified, and the relatively common opinion is: FPG≥6.1mmol/l, PPG≥7.2mmol/L (meeting one of them is sufficient), which should be carefully analyzed by the specialist in practice (for example, FPG≥5.6mmol/L should be considered as positive for those who are already obese). The criteria for positive finger glucose are even less uniform and are related to the glucose meter, and are determined by the medical staff conducting the mass screening. If the screening result is “positive” the person enters the diagnostic process to determine whether diabetes is present or not, and if the screening result is “negative” and only other characteristics are met, the person should be screened more frequently and at regular intervals (the more bars met, the shorter the interval practice should be) every 2 years, every year, or even every 6 months, as appropriate. (e.g., children who are obese may need to be screened every 2 years from age 10 years onwards, in conjunction with other specific circumstances).