Diabetes is a group of lifelong metabolic diseases characterized by chronic hyperglycemia caused by multiple etiologies. Long-term elevated blood glucose damages large blood vessels and microvessels and endangers the heart, brain, kidneys, fundus, feet, and peripheral nerves. More than half of diabetic deaths are caused by complications of cardiovascular disease and 10% are caused by nephropathy; amputation in diabetic patients is 10-20 times more common than in non-diabetic patients. Therefore, to avoid complications, blood glucose control is the key. As age increases and the disease progresses, the patient’s condition will also change. Taking medication without review will not keep abreast of changes in the condition and increase the risk of complications. Therefore, even if you have taken medication and controlled your blood glucose at the beginning of the disease, you should not neglect the importance of regular review, and make lifelong control of blood glucose the ultimate goal of self-management of diabetes. In case of stable condition, it is recommended that diabetic patients should go to the hospital every three months to measure fasting blood glucose, 2-hour postprandial blood glucose and glycated hemoglobin index, and every other year to evaluate islet function. If you find small fluctuations, you should first self-regulate through diet and exercise, and then go to the hospital immediately if the regulation is not effective. In conclusion, the causes of diabetes are different, and the changes of blood glucose among different individuals are even more subtle, so the treatment should be based on the principle of individualization, with the help of examination means and reasonable selection of drugs.