Abstract: To evaluate the clinical effect of Buzhong Yiqi pill in the treatment of postpartum stress urinary incontinence. Methods: 80 cases of postpartum stress urinary incontinence were divided into observation group and control group. The control group was treated with neuromuscular electrical stimulation and biofeedback. The observation group was treated with Buzhong Yiqi Pill on the basis of the control group. Before treatment, 8 weeks and 3 months after treatment, the frequency of urinary incontinence, the score of pelvic floor muscle strength and the weight of urinary pad were compared. Three dimensional ultrasound was used to evaluate the area of the pelvic floor cleft, the angle of the bladder neck and the distance between the bladder neck and the pubic symphysis. Results: 8 weeks after treatment, there was no significant difference in the total effective rate between the two groups (P > 0.05). The total effective rate of the observation group was higher than that of the control group (P < 0.05). At 8 weeks and 3 months after treatment, the frequency of urinary incontinence and the weight of urinary pad in the two groups were lower than that before treatment, and the score of pelvic floor muscle strength was higher than that before treatment (P < 0.05). There were significant differences in the frequency of urinary incontinence, the score of pelvic floor muscle strength and the weight of urinary pad between the two groups at 8 weeks and 3 months after treatment (P < 0.05). At 8 weeks and 3 months after treatment, the area of the pelvic floor fissure and the angle of the bladder neck in the resting and Valsalva state of the two groups were significantly lower than that before treatment, and the distance between the bladder neck and the lower edge of the pubic symphysis was significantly higher than that before treatment. The difference between the two indexes was statistically significant (P < 0.05). Conclusion: Buzhongyiqi pill can improve the effect of postpartum stress urinary incontinence, and three-dimensional ultrasound of perineum can provide ob＜x＞jective index for pelvic function.Keywords: Transperineal three-dimensional ultrasound; Buzhong Yiqi pill; postpartum stress urinary incontinence