The article examines the application of the principle of the active role of the court in the administrative proceedings of the Republic of Kazakhstan and foreign countries. The attention is paid mainly to the identification of the main function and the system of application of this principle. The scientific novelty lies in the study of important subordinate guiding principles, the influence of which is decisive when applying the principle of the active role of the court in the administrative proceedings of the Republic of Kazakhstan. The authors conclude that the judge should apply the principle of the active role of the court in order to have a fair trial within a reasonable time.