早产约占分娩总数的5%15%,早产儿中约有15%于新生儿期死亡,有8%的早产儿虽能存活,但留有智力障碍或神经系统的后遗症。也有人认为75%以上的围产儿死亡与早产有关。因此防治早产可显著降低围产儿死亡率,日益得到产科工作者的重视[1]。以前预测早产主要依靠产科病史、先兆症状、 Premature delivery accounts for about 5% and 15% of all deliveries. About 15% of premature babies die during the neonatal period, while 8% of premature babies survive but have mental retardation or neurological sequelae. Some people think that more than 75% of perinatal deaths are related to premature birth. Therefore, prevention and treatment of preterm birth can significantly reduce the perinatal mortality rate, increasing attention of obstetric workers [1]. The previous prediction of preterm birth mainly depends on obstetric history, aura symptoms,