Nowadays the clinical significance of an occult stress urinary incontinence and its optimal treatment is not known.Regarding treatment, there are 2 main approaches : either the systematic preventive treatment of the occult stress urinary incontinence by means of a tension free vaginal tape (TOT) together with the treatment of prolapse or the treatment of prolapse in the first place and treatment of stress incontinence in a second time when and if it appears.This study is expected to provide objective evidence concerning the efficacy and security of TOT implantation for the prevention treatment of occult stress urinary incontinence in women with pelvic organ prolapse and occult urinary incontinence.The perspective is to improve the management of these patients by providing evidence based recommendation for their treatment.