Good glycemic control generally refers to diabetic patients with fasting blood glucose of 4.4-7.0 mmol/L, 2-hour postprandial blood glucose of 10 mmol/L or less, glycated hemoglobin of 6.5% or less, and low incidence of hypoglycemia. Glycemic control criteria should be determined according to the patient’s age, duration of diabetes, underlying conditions, co-morbidities, risk of hypoglycemia, etc. Currently, the criteria for glycemic control can be set as strict, general, or lax criteria. For most diabetic patients, achieving the strict standard level is considered good glycemic control. Tight glycemic control refers to the common criteria for assessing glycemic control except for fasting blood glucose, postprandial blood glucose, and glycated hemoglobin, but also includes day-to-day fluctuations in blood glucose, hypoglycemia, and so on. Tight glycemic control helps to delay the development of chronic complications of diabetes such as diabetic retinopathy, diabetic nephropathy, and diabetic macrovascular disease. To keep blood glucose under good control, one needs to take hypoglycemic drugs as prescribed by the doctor, and at the same time, one should exercise moderately, control the diet, and avoid the intake of foods with high sugar content such as soymilk and rice. If you have poor blood glucose control in your daily life, it is recommended that you go to a regular hospital in time to avoid delaying your condition.