Multiple sclerosis (MS) is an inflammatory demyelinating disease of the central nervous system that develops due to the activation of selfreactive T-cells specific for myelin components. Regulatory T-cells CD4+CD25+Foxp3+ (T-reg) play an important role in the autoimmunity control and inhibition of T-cells-mediated myelin destruction. The aim of the study was to determine a number of T-reg in the blood of patients in different stages of disease, to evaluate their functional activity and to obtain T-reg induced ex vivo. The phenotypic analysis revealed the 2-3 fold reduction of T-reg in the exacerbation phase of MS and the increase of their content in the remission while the level of T-reg in the donor's blood remained significantly higher. The inverse correlation between the degree of severity and duration of MS and the number of T-reg was found. The suppression function of T-reg of MS patients was substantially decreased in the exacerbation and remission stages. The induction of ex vivo T-reg allows to increase the number of these cells by 30-90 times during 6-8 days. The induced T-reg have phenotypic and functional characteristics of native T-reg. The adaptive cell treatment using induced T-reg may become an instrument for correction of immune dysfunction in MS.