Methods Painless labor group(observation group) 312 cases(213 cases using fetal monitor to observe uterus contraction pre and post narcosis), contrast group 156 cases. Having had regular uterus contraction, they are special attended by midwives.

• 方法 随机分成无痛分娩组(观察组)312例(其中麻醉前后使用胎儿监护仪观察于宫情况的213例),对照组156例。