Patients with pre-pregnancy diabetes mellitus type I cannot stop taking the medication; patients with gestational diabetes mellitus usually stop taking insulin after delivery, and a few patients need to continue to use it. 1. Pre-pregnancy diabetes mellitus type I: the disease is usually caused by autoimmunity, the patient’s pancreatic β-cells are destroyed, resulting in insufficient insulin secretion and progressive aggravation, once the diagnosis is confirmed, it is necessary to use insulin treatment for a lifetime, so the pregnant woman suffering from type I diabetes mellitus can not be discontinued casually insulin. 2. Gestational diabetes mellitus: due to abnormal metabolic function during pregnancy, diabetes mellitus symptoms may appear, and need to use insulin treatment according to the condition, most pregnant women can stop using insulin after giving birth, but some patients still need to carry out insulin treatment, and the dosage needs to be adjusted according to the blood glucose level. It is recommended that patients strictly follow the doctor’s instructions for the use of medication.