The collection of selected works of a prominent Kazakh constitutionalist, Doctor of Law, Professor K.K. Aitkhozhin considers a wide range of general theoretical and practical issues of the science of constitutional law of the Republic of Kazakhstan: ontology of the Constitution, its social and legal essence, subject, content and form, legal properties. The collection includes selected articles published in 2000-2023, devoted to the problems of development of Kazakhstan constitutionalism, the mechanism of action and implementation of the Constitution, the role of the Constitution in the development of current legislation, in increasing constitutional and legal culture, improving legal education and legal education. The book includes scientific works published by the author during the period of intensive development of the branch of constitutional law in Kazakhstan, and, reflecting the practice of the formation of Kazakhstan constitutionalism, focuses on a more complete and effective use of the democratic legal potential of the Constitution of the Republic. The book may be recommended to students, masters, doctoral students, faculty of law schools, employees of state bodies.