Ethnic sociology becomes today, in conditions of the increase of significance of ethno-national problems in the public life, one of the important fields of sociologic knowledge. At the same time it is a relatively young sociologic theory of the middle rank (level) in the sphere of the home sociologic theorizing. Thus, the range of publications dedicated to ethno-sociology itself is also rather limited. The question may be only in one manual by Vira Arbenina (Kharkiv), one methodical manual of Viktoria Sereda (Lviv), several vocabulary-reference publications issued under supervision of professor Volodymyr Yevtukh (Kyiv) and separate papers in scientific journals and certain themes in some educational editions, as, for example, in the manual Sociology by Natalia Chernysh, a sociologist from Lviv. This explains availability of a number of problems characteristic of the science which is only arising. First and foremost they include such ones as formulation of the notions of object and subject, definition of the principal purpose, basic tasks and functions of this science, determination of its place and role in the structure of sociologic knowledge. A necessity 'to take off' the above problems has certainly conditioned the polemic character of this paper as well. The author, when substantiating the urgency of ethno-national subjects, specially accentuates its relations with global migration processes. The paper emphasizes the importance of problem approaches both for ethno-sociology and for any sociologic science; supports actively the ideas of a necessity to distinguish the main function of ethno-sociology, expediency of the national character of priorities of subject trends in ethno-sociologic investigations, changeability of the subject field of those investigations, etc. The author considers this paper as the invitation to discussion.