Insulin 30/70 refers to premixed insulin, which contains 30% regular insulin and 70% intermediate-acting insulin. Insulin is a commonly used clinical hypoglycemic hormone, and there are many types of insulin, including rapid-acting insulin, short-acting insulin, intermediate-acting insulin, long-acting insulin, and premixed insulin depending on the duration of action. Pre-mixed insulin is for the convenience of clinical use, the manufacturer will short-acting insulin and intermediate-acting insulin pre-mixed in a certain proportion. Premixed insulin, depending on the composition of the short-acting insulin contained, is categorized into premixed human insulin and premixed insulin analogs. Depending on the ratio of short-acting insulin, they can be categorized into premixed types such as insulin 30/70, insulin 50/50, and insulin 25/75. Premixed insulin can be injected subcutaneously before breakfast and dinner and is effective in controlling fasting and postprandial blood glucose. In rare cases, premixed insulin analogs can also be administered subcutaneously three times daily.