Abstract: Objective To study the change of urinary flow rate in postpartum women.Methods The urine flow rate of 224 women after 42-60 days delivery were detected by Dantec DUETLogic urodynamics instrument.Results The urinary flow rate (MFR), average urinary flow rate (AFR), voiding volume (VV), maximum urinary flow time (TTMR), micturition time (VT) and urine flow (FT) had significantly abnormal changes. The urine flow rate chart appeared significant difference from normal urine flow rate chart. Among the cases, 54% of the results of free urine flow of vaginal delivery women and cesarean section women were abnormal. The free urine flow rate of vaginal delivery women was 69% abnormal. The free urine flow rate of cesarean section women was 32% abnormal. The free urine flow rate of the previous vaginal delivery women was 71% abnormal. The free urine flow rate of the previous cesarean section women was 34 percent abnormal. The types of abnormal urine flow rate charts included deuterium muscle weakness and abdominal pressure urination, outlet obstruction and high row high resistance, outlet obstruction and low row high resistance, diuretic muscle weaknessoutlet obstruction and abdominal pressure urination, coordination disorder and abdominal pressure urination.Conclusion Postpartum pelvic floor rehabilitation treatment is essential to prevent long-term urinary incontinence.