Migration issues take leading positions in political, media and academic discourse. Most current residents of different countries, regions and cities face the direct and indirect consequences of population migration on a daily basis even it is not their own migration. The issue of adaptation and integration of migrants occupies one of the significant roles among migration issues. The article presents an analysis of scientific approaches to the essence and content of the concept of “migration behavior”, “social integration” and “social adaptation”, of the data of sociological studies among foreign migrants conducted in the border regions of Russia with different ethnic composition (n = 449). Models of factors of social integration and non-integration of migrants are obtained on the basis of regression analysis.