With an interval of one week or more between insulin injection sites, insulin is an effective method of blood sugar control for diabetic patients. The use of insulin must be under the guidance of a doctor, and the appropriate insulin treatment plan must be selected according to the patient’s age, weight, degree of blood sugar elevation, type of diabetes and complications. Diabetic patients must master the correct method of insulin injection and be familiar with the injection site of insulin. The injection sites of insulin can be on the abdominal wall, the outer side of the upper arm, the outer thigh, the buttocks, etc. During the process of insulin injection, care should be taken to change the injection site and avoid repeated injections. The interval between injection sites should be at least one week, and patients can separate insulin injection sites into areas by themselves. For example, the abdomen can be divided into four parts, and the injection sites can be changed regularly. Avoid injecting the same site for a long time, which will cause the irritation of the injection site to worsen, as well as the symptoms of fat hardening and fat atrophy at the injection site, which will affect the absorption of insulin.