Abstract: Ultrasound is gradually used in assessing the progress of labor by judging the fetal position and head station，assisting clinical management.On the basis of guidelines and clinical studies，this paper describes the role of prenatal ultrasound and ultrasonic parameters and their effects on pregnancy outcomes.

Key words: ultrasound, labor process, pregnancy outcome, AoP, HPD

摘要： 超声逐渐用于产时判断胎方位和胎头位置来评估产程进展，辅助临床进行分娩管理。文章依据临床指南和临床研究，阐述产时超声监测的参数指标及其对改善分娩结局的作用。

关键词: 超声, 产程, 妊娠结局, AoP, HPD