Avereferat dissertation for the degree of Doctor of Sociological Sciences . Specialty 22. 00. 04 social structure, social institutions and processes . Ulan-Ude 2008. - 20s. The work was carried out in the Department of History, Ethnology and Sociology of the Institute of Mongolian Studies, Buddhism and Tibetology of the Siberian Branch of the Russian Academy of Sciences . The object of the study is ethno-social groups of Russians in the republics of Siberia (Altai, Buryatia, Tyva, Khakassia, Sakha (Yakutia)) . Subject of research - social development of Russians in ethno-social structure of republics in modern conditions : adaptation to changed socio-economic conditions, demographic trends, ethno-social stratification, educational strategies, social well-being, the nature of interethnic interaction, the degree of ethnic and confessional tolerance . That is, we consider the changes that have occurred with ethnic groups, conditionally speaking, between the last two censuses of the country - the All-Union 1989 .. the All - Russian Federation 2002 . As well as for the period up to 2008. The purpose of the study is to identify the features and trends of ethno-social changes characterizing the Russian population of the republics of Siberia in the late XX - early XXI century. Objectives of the study: to define conceptual approaches and methodological principles of the study of the Russian population in the ethno-social structure of the republics of Siberia ; clarify the concepts of "ethnosocial structure" and "ethnosocial group" ; describe the social strategies and practices of Russians in the republics in the context of ethno-social stratification; to find out the degree of social well-being of the Russian population in the republics of Siberia in the conditions of socio-economic transformations, its impact on interethnic relations and integration processes ; determine the relationship between adaptation strategies of the Russian population and socio-economic features of the development of the republics ; identify the main trends in the demographic development of the Russian population of the republics of Siberia ; establish educational strategies for the region's major contact ethnic groups as an important resource for adaptation and a channel for upward social mobility; consider the psychological characteristics of the state of the Russian population, explore the levels of ethnic and confessional tolerance of Russians ; describe the activities of public authorities and civil society institutions related to the preservation of the traditional culture of the Russian population .