The statement of oxytocics put into the uterus is wrong, clinically there are only two kinds of drugs to induce labor, vaginal and intravenous administration, but the time of action is uncertain. Oxytocics administered vaginally are usually prostaglandin preparations, such as dinoprostenone suppositories, which can promote cervical ripening and uterine contractions, and can be used in patients with a cervical score of less than 6 and no contraindications to vaginal delivery; oxytocics administered intravenously are usually oxytocin, which can enhance contractions, and are usually used in pregnant women with a ripe cervix. Prostaglandin pessary in use, can be left placed in the vaginal opening, in the contractions to reach a certain strength can be removed in time, because of the safer, and more widely used. However, the time of action is not certain, the time can be from a few hours up to tens of hours, or even do not work. Oxytocin is commonly used in obstetrics and gynecology to induce labor, but its time of action is not certain, the time can range from hours to days, and even the failure of induction of labor is possible. Whichever drug is used to induce labor, it should only be used after examination and evaluation by a physician.