Menthol 30 injection is a premixed insulin analog, which contains 30% ultra-short-acting insulin and 70% intermediate-acting insulin. Menthol 30 injection has a fast onset of action and a short time to peak, and it can be injected subcutaneously before or during meals, and it can be replenished immediately after the meal if the patient omits to inject or forgets to inject insulin. Menthol 30 injection can effectively reduce the incidence of hypoglycemia before the next meal, Menthol 30 injection should pay attention to the following points: 1, Menthol 30 injection can be injected subcutaneously twice a day to effectively control fasting and postprandial blood glucose, individual patients with a large amount of Chinese food or blood glucose after Chinese food rises significantly, it can also be injected subcutaneously three times a day. 2, Menthol 30 injection can be combined with metformin to achieve short peak time, can be used before or during meals. 30 injection can be used in combination with biguanide preparations, glucosidase inhibitors, and insulin sensitizers.