The dose of long-acting insulin can be 0.5~1.0IU/(Kg-d) at the beginning, and then adjusted according to the blood glucose, but different individuals have different insulin dosage, so it cannot be generalized. Long-acting insulin is characterized by the absence of a significant peak of action and can provide basal insulin. The initial dose of long-acting insulin preparations can be set at 0.5~1.0 IU/(Kg-d), and the dose can be adjusted again if the patient’s pancreatic β-cells are not functioning well or if the blood glucose fluctuates greatly. The use of insulin should start with a small dose and gradually adjust to the appropriate dose according to the blood glucose level. The use of insulin should be under the guidance of a physician.