In the article role of the Institute in the study of processes taking place among indigenous ethnos of the Republic of Khakassia at the turn of the XXth – the beginning of the XXIth century is under consideration. In cooperation with institutes RAS and SB RAS complex researches were held in the region. Problems of the Khakass people are determined. One important of which is linguistic assimilation. The results of scientists’ joint work are published monographs and books.