There is no insulin that works absolutely well, and patients with different conditions are suitable for different kinds of insulin, which need to be selected according to the patient’s condition. Insulin can be categorized into ultra-short-acting insulin, short-acting insulin, intermediate-acting insulin, long-acting insulin, ultra-long-acting insulin and pre-mixed insulin, etc. There are differences in the onset of action and the duration of peak concentration of different types of insulin after injection, and according to the needs of patients’ condition, they can also choose to be injected or pumped with insulin. Different types of insulin can simulate physiological basal insulin secretion, simulate physiological mealtime insulin secretion, and balance fasting and postprandial glycemic control by choosing different types of insulin for different conditions of patients, and irrational use of insulin may cause hypoglycemia. Insulin should be used under the guidance of physicians, and it is recommended that patients go to the endocrinology department of regular hospitals for detailed consultation and prescription of drugs, do not use drugs on their own.