At this time belongs to premature rupture of unterm fetal membranes, if it is not accompanied by infection and the maximum depth of amniotic pool is greater than 3㎝, take the following methods: First, general treatment. Absolute bed rest, keep the vulva clean, avoid unnecessary anal and vaginal examination, closely observe the maternal temperature, heart rate, contractions, the nature of vaginal fluid and the blood white blood cell count. Second, prevent infection. If the membranes are broken for more than 12 hours, give antibiotics to prevent infection. This will reduce the incidence of pneumonia, sepsis and intracranial hemorrhage in the newborn fetus, and also significantly reduce the incidence of chorioamnionitis and postpartum endometritis. It is recommended to use intravenous antibiotics for 2-3 days first, and then you can switch to oral antibiotics for maintenance. Third, give contraction inhibitors, if there are contractions present. Fourth, give drugs to promote fetal lung maturation.