The paper examines the methodological and theoretical aspects of determining the place of corporate law in the legal systems of the Russian Federation and the Republic of Kazakhstan. The author analyzes approaches to understanding the essence of corporate law, its structure and place in the legal system. Particular attention is given to the systems approach as a methodological basis for the study of corporate relations. The paper proposes the author’s concept of an ideal model of corporate regulation, based on the principles of systemic coherence, terminological unification, and methodological unity. A comparative analysis of the legal regulation of corporate relations in Russia and Kazakhstan is carried out from the standpoint of this theoretical model. The study also explores the problems arising from the absence of a unified methodological framework in corporate law and suggests ways to address them. The author concludes that there is a need to develop unified systemic methodological foundations of corporate law in order to ensure effective legal regulation of corporate relations within the context of Eurasian economic integration.