According to the World Health Organization in 1999, a fasting blood glucose greater than or equal to 7.0mmol/L, or a blood glucose greater than 11.1mmol/L 2 hours after a meal, can be diagnosed as diabetes. However, in our clinical practice, we cannot put the diabetes cap on the patient based on one blood glucose alone, but we have to repeat the fasting and 2-hour post-meal blood glucose test again, and if it is still at this level, it can be diagnosed as diabetes. Why should it be repeated? Because there are many people who eat too well, too sweet, too much during these days, which can create a transient hyperglycemia that will return to normal after a few days. Once the diagnosis of diabetes is made it is necessary to first control the diet, increase exercise, lose weight in obese people, and repeat the blood sugar after three months if it still does not meet the standard, plus oral hypoglycemic drugs.