Introduction. The author analyzes the problems of organizing and conducting long-term Antarctic expeditions related to the structure of interpersonal interaction in small groups of specialists of different profiles. Aim: to determine the structure of intra-group relationships and to analyze the interpersonal interaction between the members of Ukrainian Antarctic expeditions. Methods: J. Moreno "Sociometry" (intra-group relationship). Results. Based on the obtained sociometric data, the author

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... termined the indicators of the Antarctic expedition members' sociometric statuses, the structure of their relationships in relation to their activities (professional, home, leisure) as well as revealed the seasonal cycle of these relationships. Conclusions. The organization and conduct of polar expeditions should be based on the determined structure of intra-group relationships, as well as the psychological, interpersonal and season-dependent features of intra-group interaction (activation and recession).