Objective To explore the influence of non -urethral suspension surgery in tension -free vaginal tape -obturator technique on patients with stress urinary incontinence.Methods 80 patients with stress urinary incontinence were researched,they were divided randomly into observation group (40 cases) and control group (40 cases).The control group was treated by conventional drug therapy +functional exercise,while the observation group was treated by tension -free vaginal tape -obturator technique on the basis of the control group.The urethral dynamics before and after two months treatment were compared,and the clinical therapeutic effect and recurrence rate were compared.Results After treatment,the voiding time of the observation group was longer than that of the control group[(25.78 ±4.15)s vs.(21.42 ±3.41)s,t =3.465,P <0.05],the mean urinary flow rate was lower than the control group[(6.41 ±1.14)mL/s vs.(9.84 ±1.79)mL/s,t =10.222,P <0.05].The functional urethral length, maximum urethral closure pressure of the observation group were higher than those of the control group[(38.94 ± 8.41)mm vs.(33.47 ±5.38)mm,(36.94 ±9.21)cmH2 O vs.(31.73 ±7.19)cmH2 O,t =3.465,2.820,all P <0.05].The total effective rate of the observation group was higher than that of the control group(72.5% vs.70.0%,χ2 =11.113,P <0.05).After six months of follow -up,the recurrence rate of the observation group was lower than that of the control group(0.0% vs.10.0%,χ2 =4.210,P <0.05 ).Conclusion In patients with stress urinary incontinence,tension -free vaginal tape -obturator technique can significantly improve the urethral dynamics,promote recovery of illness,it is worthy of application and promotion.