The results of induction:There were no statistical differences in the success rate of labor induction, the delivery style , postpartum hemorrhage for 2 hours, the neonatal weight Apgar score,postparturm morbidity among the three groups(P> 0.05 ).

• 引产结果引产成功率、分娩方式、产后2h出血量、新生儿体重、新生儿Apgar评分、产后病率3组间比较；差异无显著性意义(P>0.；05);