Abstract: Objective: To invetigate the effective method in promoting cervical maturity for providing an effective, safe and convenient delivery approach in overdue gestation. Methods: Ninety pregnant women with induction properties and cervical score less than or equal to 6 points were randomly divided into oxytocin induced labor group(control group A), dinoprostone suppository induced labor group(control group B) and cervical dilation balloon group(study group) by a case-control study(30 cases each group). The effects of cervical maturity, success rate of vaginal delivery, adverse reactions and duration time from using medicine to delivery between three groups were compared. Results: The effective promoting cervical maturity in 29 cases and water balloon off in 1 case of study group were found, 12 cases in control group A and 27 cases in control group B were valid, and the effective rates in study group and control group B were higher than that in control group A(P<0.05). The vaginal delivery of 23 cases in study group, 11 cases in control group A and 22 cases in control group B were successful, the difference of which was statistically significant(P<0.01)). The uterine hyperstimulation in 2 cases of control group B occured, who improved immediately after removing the drug. The neonatal asphyxia in 1 case(Apgar for 7 points) and severe asphyxia in 1 case(Apgar for 3 points) and abnormal fetal heart rate in 6 cases were identified. The abnormal fetal heart rate in 1 case, and no uterine hyperstimulation, tetanic contraction and neonatal asphyxia in study group were identified. The neonatal asphyxia in 2 cases(Apgar for 7 points and 6 points) and abnormal fetal heart rate in 5 cases were found in control group A, the differences of whose between 3 groups were not statistically significant(P>0.05). The duration time from using medicine to delivery in control group A was longer than that in control group B and study group(P<0.05). Conclusions: The effect of cervical dilatation balloon in promoting cervical maturity is similar to dinoprostone suppository, and higher than that of oxytocin, which is mild, safe and less complications.