Abstract: This article examines the functionality of the children leisure and entertainment centers, demonstrates their functional circuit comprised on the basis of Rosstat statistical data on the number of students of the various disciplines of the advanced educational programs. The author determines the system of functional modular units as the most viable principle of the design of children leisure and entertainment centers that meets all the requirements imposed on the buildings of such type. The research defines the types of modular units intended for engineering of the children leisure and entertainment centers, as well as the variations of their configuration for the centers of different contemporaneous occupation. The research methods contain the systemic analysis of theoretical works in the field of design of public buildings of cultural and leisure purpose and construction of the modular prefabricated buildings, as well as the method of theoretical modelling of functional zoning of the children leisure and entertainment centers  in the context of implementation of modular technology. As a result, the author establishes that it is reasonable to divide the functionality of children leisure and entertainment centers into the three functional directions: sport, science, and art. Each of them has a diverse set of leisure and entertainment activities that are allocated to the separate rooms or sectors. Therefore, it is concluded that the construction technology of modular prefabricated buildings meets the most demands placed on the children leisure and entertainment centers. The scientific novelty lies in determination of the types of modular units and variations of their configuration.