The article presents the results of morphological evaluation of the vaginal tissues in women before and after treatment of stress incontinence with Er: YAG-laser (technologies IntimaLase and IncontiLase). Marked histological changes (increase of quantity and activity of fibroblasts, the increase of density of connective tissue, the emergence of neoangiogenesis plots) confirm the clinical efficacy of the method (the positive effect was obtained in 70,7 % of patients with I type of UI and 47 % with the II type of UI light and medium gravity).