The articlebrings forward the results of the empirical research of cognitive and regulative basic principles of schoolchildren’s tolerance formation in keeping with inclusive education. Tolerance is viewed as systematic personal quality. The cognitive level has been studied on the basis of cognitive and style approach. The regulative level was studied through the types of psychological regulation of a person. The communicative level was studied in the course of intervention program developed by us. The analysis of the results obtained during the psychological and pedagogical experiment revealed a positive dynamics. A delayed effect was detected to appear, which is highly valuable from the practical point of view. Generalization of the empirical results is helpful to providing a rational for a promising direction in the study of the problem of increasing the level of schoolchildren’s tolerance.