初步探讨了妊娠延期后伴有过度成熟综合征（ＰｏｓｔｍａｔｕｒｉｔｙＳｙｎｄｒｏｍｅＰＭＳ）围产儿发病率增高与其胎盘组织定量改变的关系。实验研究结果表明，妊娠延期后伴有ＰＭＳ者胎盘组织定量学的改变可能是其围产儿发病率高的主要原因。提示妊娠４０周后应严密监测胎盘功能以便及时发现胎盘功能不全并终止妊娠 To investigate the relationship between the increase of perinatal morbidity and the quantitative change of placental tissue after postmenopausal pregnancy complicated with postmaturity syndrome (PMS). The experimental results show that the quantitative analysis of placental tissue changes associated with PMS after the extension of pregnancy may be the main reason for the high incidence of perinatal children. Tip 40 weeks after pregnancy should be closely monitored placental function in order to timely detection of placental insufficiency and termination of pregnancy