Diabetes is not scary, but complications are. How to reduce or delay the emergence of complications? 1. Pay attention to complications early and nip macrovascular complications in the bud in the early stages of diabetes. Macrovascular complications may begin as early as the pre-diabetes stage (i.e., the stage of impaired glucose tolerance and abnormal fasting glucose), along with the emergence of insulin resistance, and not always after the onset of diabetes. Therefore, we should actively intervene in people who are at high risk of pre-diabetes, not only to reduce the occurrence of diabetes, but also to prevent macrovascular complications. 2. Focus on blood glucose control and control of multiple risk factors. Complications of diabetes, especially macrovascular complications (mainly cardiac, cerebral and lower limb vascular) are the result of multiple risk factors acting together. Therefore, to prevent macrovascular complications, it is not enough to control blood glucose alone, but also to control blood pressure, blood lipids, blood viscosity and weight, and to control the standard. 3, smooth and individualized control of blood sugar, reduce fluctuations. The occurrence and development of chronic complications of diabetes is not only related to the overall increase of blood sugar, but also closely related to blood sugar fluctuations (i.e., high and low), the greater the fluctuation of blood sugar, the higher the incidence of chronic complications and the worse the prognosis. In addition, the lower the blood glucose control, the better. For patients who are old, have long disease duration, many complications, cardiovascular and cerebrovascular diseases or have limited life expectancy and are prone to hypoglycemia, it is not advisable to lower the blood glucose too low, and the danger of hypoglycemia to them is much higher than that of hyperglycemia. Therefore, we should avoid hypoglycemia as much as possible to control high blood sugar, reduce the harm caused by blood sugar fluctuation, and realize individualized control. In short, we should achieve early intervention, all-round control of various cardiovascular risk factors (such as blood glucose, blood pressure, blood lipids, blood viscosity, obesity, etc.), reduce blood glucose fluctuations, in order to reduce or delay the occurrence of chronic complications of diabetes.