The normal value of total glycated hemoglobin is 4%-6%, which is used to diagnose diabetes and response, an indicator of the average level of glycemic control in the last two to three months, is the product of the combination of hemoglobin and sugar on the red blood cells in the blood, so the total glycated hemoglobin is a measure of the gold standard of glycemic control, and an important means of diagnosis and management of diabetes, independent of daily fluctuations of blood glucose, and not affected by exercise or food. At the beginning of treatment, diabetic patients should be monitored every 3 months, and after reaching the standard, they can be monitored every 6 months. If the total glycated hemoglobin is greater than 9%, it means that the patient has persistent hyperglycemia, which will lead to complications such as diabetic nephropathy, atherosclerosis, cataract, etc., and is also a high-risk factor of myocardial infarction and stroke death, which can be said that total glycated hemoglobin is an indicator of the control of the diabetic patient’s glucose in the last two months. It can also be said that total glycosylated hemoglobin is an indicator to check the effect of blood glucose control in diabetic patients in the past two months, if it is not within the normal range, it must be adjusted as soon as possible under the guidance of the doctor at the endocrinology department of the hospital, and carry out glucose lowering treatment.