Induction of labor is a method of termination of pregnancy in mid- to late-term pregnancies, in which the uterus is induced to contract rhythmically by means of medication, thus allowing the fetus to be delivered. With the rapid development of anesthesiology, it is now technically possible to induce labor painlessly, but with limitations. Because drug induced labor does not have a regular labor process like normal full-term delivery, so if the anesthesia time is too early, it will easily lead to prolonged labor or even affect the start of contractions and the intensity of contractions. There are also women who are pregnant again after cesarean section, because painless induction of labor can significantly reduce the pain of contractions, but also may mask the clinical symptoms of a prior rupture or rupture of the uterus in women with scarred uterus, increasing the risk of induction of labor. It is also not recommended for women with special conditions such as malpositioned fetus or placenta previa.