Rupture of membranes refers to the rupture of amniotic fluid due to the increased pressure in the uterine cavity, and the woman will be conscious of the sudden outflow of more amniotic fluid from the vagina. In this case, rupture of membranes occurs naturally when the uterine cavity opens up to 5-6cm in the first stage of labor, or when the uterine cavity opens up to its fullest extent. After rupture of membranes, the head of the fetus will gradually descend and the uterine opening will be complete before vaginal delivery. If the rupture of membranes occurs before the woman goes into labor, it is called premature rupture of membranes. After premature rupture of membranes, the woman needs to elevate the buttocks and listen to the fetal heartbeat, and observe the fetus for the time being if there is no fetal distress. Twelve hours after the rupture of membranes, you need to give anti-infective drugs, gradually wait for the development of contractions, to observe whether the labor can be carried out smoothly, and if necessary, can be terminated by Caesarean section, in rare cases of premature rupture of membranes, if it occurs before the 28th week of gestation, most of them will be spontaneous abortion, and the baby will not be able to survive.