Conlusions: AFI monitored at prenatal stage with B mode ultrasound is important for forseeing fetuses safety on the high dangerous and overdue gestational period.

• 结论：围产期羊水指数监测有利胎儿生长发育，高危妊娠，过期妊娠预测胎儿安全具有重要意义，可降低围产期胎儿病死率。