The article discusses the problem of specifics of professional activities of heads of state power in modern conditions and the role of subjective psychological factors in the success of its implementation. It is noted that along with the function of "normative control", the head of power must take independent management decisions in conditions of increased social responsibility. This can give rise to intrapersonal conflict, moral and intellectual overload of the politician, which affect the effectiveness of its activities. When the hierarchical status of the manager increases, its power, freedom to exercise power, and therefore personal responsibility for making managerial decisions increase too. In this regard, the importance of subjective factors when exercising power functions of the head is increasing. The concepts “power” and “management” are analysed in the article, the characterisation of the subject exercising power is given in comparison with the “manager”, the psychological concepts of power and the compensatory nature of the need for power are highlighted. The author draws attention to the variety of studies of power motivation, the presence of various approaches to the analysis of power motives, the possibility of highlighting the instrumental and value, personality-oriented and socio-oriented components of power motivation. The importance of the existence of socially-oriented motives in the structure of motivation of heads of government bodies is emphasised, as well as the need to form a system of prosocial value orientations, which can determine the qualitative specificity and effectiveness of heads' activities. The importance of improving the personnel selection system for positions of heads of state power, taking into account value-motivating factors, is discussed.