在正式临产前胎膜即破裂者称为胎膜早破。为常见的妊娠并发症，是早产及围产儿死亡的常见原因之一。1 资料与方法 1.1 资料来源 选择1998—1999年间住院分娩的头位胎膜早破180例,孕周分布在30—42周，其中孕37周以下者19例，10.5%，大于孕37周者161例，占89.5%，年龄在20—40岁 Membranes in the formal prenatal rupture known as premature rupture of membranes. One of the common causes of preterm and perinatal death is a common pregnancy complication. 1 Materials and Methods 1.1 sources of information selected 1998-1999 head hospital delivery of 180 cases of premature rupture of membranes, gestational age distribution in the 30-42 weeks, of which 37 weeks of pregnancy less than 37 cases, 10.5%, greater than 37 weeks pregnant 161 cases, accounting for 89.5%, aged 20-40 years