Objective To observe the effect of Sizi powder hot compress on pelvic floor function of female patients with mild to moderate stress urinary incontinence(SUI). Methods Female patients with mild to moderate SUI were randomly and evenly divided into 2 groups. The control group (n=39) received conventional rehabilitation and nursing care, while the intervention group (n=38) additionally received Sizi powder hot compress therapy, 20 minutes each time, 3 times/week, for a total of 4 weeks. Before and after the intervention, patient′s pelvic floor muscle function, pelvic floor tissue morphology, the overall situation of urinary incontinence, were measured and compared; the overall situation of urinary incontinence and the efficacy of urinary incontinence therapy measured at 1 month post-intervention follow-up were also compared. Results After intervention, the pelvic floor surface electromyography values in the pre-rest, rapid contraction and post-rest stages in the intervention group were better than those in the control group, likewise for the area of levator ani muscle hole; the scores of overall situation of urinary incontinence measured after intervention and at 1 month post-intervention follow-up in the intervention group were significantly higher than those in the control group, likewise for efficacy of urinary incontinence therapy measured after intervention (P<0.05,P<0.01). Conclusion Sizi powder hot compress can boost recovery of pelvic floor muscle function in women with mild to moderate SUI, and improve urinary incontinence.