Abstract: ob＜x＞jective: To analyze the factors influencing the maximum value of fast muscle contraction and average value of slow muscle contraction in electrophysiological assessment of pelvic floor after delivery.Methods: A total of 1153 postpartum women who underwent pelvic floor electrophysiological assessment in the Second Affiliated Hospital of Nantong University and Dafeng People’s Hospital of Yancheng city from January 2020 to February 2021 were selected, and their hospitalization information and delivery records within 2 weeks before delivery were retrospectively analyzed.Results: Among the 1153 subjects, 576 were in the normal group and 577 were in the abnormal group. The mean value of slow muscle contraction was 351 in the normal group and 802 in the abnormal group.There were statistically significant differences between the normal group and the abnormal group in gestational age, the proportion of vaginal delivery, the length of the first and second stages of labor, the proportion of perineal laceration, the rate of perineal lateral resection and the newborn birth weight in the postpartum pelvic floor electrophysiological evaluation (P < 0.05).There were statistically significant differences between normal group and abnormal group in average value of slow muscle contraction in prenatal BMI, triglyceride level, proportion of forceps assisted delivery, proportion of vaginal delivery, length of second labor, proportion of perineal laceration and newborn birth weight (P < 0.05).Conclusion: Prenatal education during pregnancy can avoid overdue pregnancy and control fetal weight. Strengthening the management of labor process, avoiding the long labor process and improving the delivery technology may play a certain role in reducing the postpartum pelvic floor injury.