Objective:To observe the clinical effect of pelvic floor ultrasound in the diagnosis and rehabilitation training of postpartum stress urinary incontinence(SUI).Methods:From May 2017 to May 2019, 200 SUI patients and 200 healthy pregnant women in the same period admitted to the First People's Hospital of Huzhou were selected in this study.All the subjects were tested by perineum and pelvic floor ultrasound, and the patients with SUI were instructed to carry out pelvic floor muscle rehabilitation training, the level of rehabilitation training effect was evaluated, and to statistically analyze the difference of pelvic floor ultrasound parameters between the patients with SUI and the healthy women, and the patients with different levels of efficacy.Results:The results of pelvic floor ultrasound in SUI patients were significantly higher than those in healthy women( t=6.536-14.925, all P<0.05). The rate of urinary leakage in SUI patients [88.50%(177/200)] was significantly higher than that in healthy women [10.50%(21/200)](χ 2=243.384, P<0.05). The total effective rate of rehabilitation training was 79.50%(159/200). The bladder neck moving distance, urethra rotation angle, posterior angle of bladder urethra in resting state and posterior angle of bladder urethra in Valsalva state in SUI patients with ineffective rehabilitation training were significantly higher than those in SUI patients with general effective rehabilitation training( t=4.662-12.537, all P<0.05). The formation rate of urethra infundibulum in SUI patients with ineffective rehabilitation training [70.73%(29/41)] was significantly higher than that in SUI patients with effective rehabilitation training [19.50%(31/159)](χ 2=40.744, P<0.05). Conclusion:The rehabilitation training of discoid muscles can effectively relieve the related clinical symptoms of postnatal SUI patients.The detection of pelvic ultrasound has a certain clinical value in the diagnosis of postpartum SUI and evaluation of rehabilitation training effect.