According to the author of the paper, the head of state is not a position, not a title, not any state body, but the function of the President of the Republic of Belarus, along with the function of the guarantor of the Constitution, human and civil rights and freedoms. The function of the head of state is unchanged and is due to his position in the system of state authorities. This function manifests the nature and essence of the institution of the presidency, which cannot be reduced to specific actions or practices, therefore, it is implemented through the exercise of powers in various organizational forms. In this regard, the concept of “president”, unlike “head of state”, is not static, but dynamic, since the list of rights and duties of the President of the Republic of Belarus is open.Powers are unambiguous, substantive rights and duties of the President, legitimized from the functions and expressed in various organizational forms of his activities. At the same time, the characteristics of the President’s powers can only show the external side of his activities. The powers of the President, in contrast to the functions, are a variable value. The President through representative, legitimation, arbitration, control, rulemaking, personnel, integration, symbolist and ceremonial state powers carries out the function of the head of state.The function of the head of state is the superiority and precedence of the President over all state officials. In accordance with it, the idea of the Republic of Belarus is personified. This function allows the President of the Republic of Belarus to be the main public representative and act on behalf of the Belarusian state both within it and in international relations. This is the result of the state obtaining the status of a legitimate state, the continuity and interaction of state authorities, mediation between them. The constitutional function of the head of state makes it necessary for the President to have instruments of power-state bodies operating within this function.