Abstract: Objective To investigatethe pelvic floor muscle function of postpartum women and analyze the related factors of pelvic floor muscle injury, so as to provide scientific basis for preventing pelvic floor muscle injury caused by delivery. Methods From January 2019 to November 2020, the parturient who had undergone a 6-8 week postpartum re-examination in the obstetrics department of each hospital in Changsha City and Zhuzhou City, Hunan Province were selected as the research objects. The data were collected and the pelvic floor muscle strength was measured. The descriptive epidemiological analysis method was used to analyze the abnormality of pelvic floor muscle strength in postpartum women, and the univariate and multivariate analysis methodswere used to analyze its influencing factors. Results A total of 1 628 parturients were surveyed, aged 22-38 years, with an average age of （29.68±5.36） years.The graviditywas 1-5, with an average of （2.43 ± 1.16） times. Theparitywas 1-5, with 1-2 being the main ones, accounting for 72.4%.Among them, 1 142 cases of parturient 6-8 weeks postpartum were found to have abnormal pelvic floor muscles strength, and the abnormality rate was 70.2%. Age 30-38 years （OR=3.766）, with parity≥3 （OR=2.633）, vaginal delivery （OR=7.478）, excessive weight gain during pregnancy （OR=1.597） and birth weight of newborns ≥4 kg （OR=5.078） postpartum women hada higher risk of abnormal pelvic floor muscles strength. Conclusion The abnormality rate of pelvic floor muscles strength in postpartum women in Hunan Province is relatively high. Age, parity, mode of delivery, weight gain during pregnancy, and weight of newborns are important causes of postpartum pelvic floor muscle injury. Corresponding measures should be taken to reducethe risk of pelvic floor muscle injury in postpartum women.

Key words: Pelvic floor muscle strength, Postpartum, Injury, Influencing factor