The article analyzes the main provisions of the Robert Alexy’s philosophy

of law as an integrated system, which at the same time remains open for further

expansion of meanings. It demonstrates how the main motive of the Alexy’s philosophy

of law — «the institutionalization of reason» as a combination of real and ideal dimensions

of law in the institutions of liberal democracy — in series takes place in the three

components of his philosophical-legal system: the theory of legal argumentation, the

theory of constitutional rights and non-positivistic concept of law.