Insulin is categorized into short-acting, intermediate-acting and long-acting insulin according to its rapid onset of action and maintenance time. 1. Short-acting insulin has fast onset of action and short duration after subcutaneous injection, and can be used to rescue patients with ketoacidosis, etc. 2. 2. Intermediate-acting insulin is mainly low-arginine insulin, which mainly provides basal insulin to control high blood glucose after two meals. 3. Long-acting insulin is mainly zinc fischer’s protein insulin, which has a long and persistent action time without obvious action peak, and is mainly used to provide basal insulin. It is recommended that patients go to the endocrinology department of regular hospitals for consultation, and standardize the use of insulin treatment under the guidance of doctors and their own conditions, and do not take medication without authorization to avoid delaying the condition.