Abstract: Objective：To observe the effect of birth ball combined with free position midwifery on the labour pain， delivery control and delivery outcomes of primipara. Methods： From June 2016 to June 2017， 100 cases of primipara in our hospital were divided into the observation group and the control group， with 50 cases in each group. The control group used the traditional supine or semi supine position during the labour； the observation group used birth ball combined with free position midwifery. The labour pain， delivery control and delivery outcomes were compared between the two groups. Results： The difference of labour pain at level 0 and level 3 between two groups was not statistically significant. In the control group， 20 cases had level 1 labour pain， accounting for 40% of the total number， in the observation group， 37 cases had level 1 labour pain， accounting for 74% of the total number； there was statistically significant difference between the two groups(P<0.05). In the control group， 28 cases had level 2 labour pain， accounting for 56% of the total number，in the observation group， 13 cases had level 2 labour pain， accounting for 26% of the total number， there was statistically significant difference between the two groups (P<0.05). The delivery control of maternal vaginal delivery of the two groups was compared use LAS score； the control group had 33 cases of maternal vaginal delivery， LAS score was (123.62±17.21)， the observation group had 41 cases of maternal vaginal delivery， LAS score was (169.37±18.73)， the difference between the two groups was statistical significance (P<0.05). Comparing the mode of delivery of the two groups， the control group had 17 cases cesarean section， 33 cases vaginal delivery， the observation group had 8 cases cesarean section， 42 cases vaginal delivery， the difference between the mode of delivery of the two groups was statistically significant (P<0.05). Comparing the newborn′s Apgar score of the two groups， the control group was (9.78±0.21)， the observation group was (9.85±0.18)， the difference between the two groups was not statistically significant (P>0.05). Comparing the maternal 2h postpartum hemorrhage of the two groups after vaginal delivery， the control group was (217.65±68.21) mL， the observation group was (197.85±40.86) mL， the difference between the two groups was not statistically significant (P>0.05). Comparing the vaginal delivery birth process of the two groups， the time of the first and second stages of labour of the observation group were less than the control group， the difference was statistically significant (P<0.05)， the difference between the time of the third stage of labour of the two groups was not statistically significant (P>0.05). Conclusion： In clinical practice， birth ball combined with free position midwifery can reduce the pain of delivery， improve delivery control and shorten the delivery time.