Premixed insulin is a mixture of short-acting and intermediate-acting preparations in varying proportions to produce a premixed insulin with a duration of action in between. The need for basal and mealtime insulin can be met with only one insulin preparation, allowing full control of fasting and postprandial blood glucose. The common feature of premixed insulin is biphasic action, which is equivalent to injecting short-acting and intermediate-acting insulin at one time, without the need for temporary preparation, and easy to use. It is easy to use. It only needs to be injected 1 or 2 times a day, which increases patient compliance and is suitable for diabetic patients who need to inject fast-acting plus intermediate-acting insulin. Pre-mixed insulin should be used under the guidance of a doctor, do not use on your own.