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The work aims to form basic approaches to the system design of roller presses on a modular basis. For the design of modern roller presses in many industries, the aggregate-modular principle of equipment creation is actively used. In this regard, the need to further develop methods for roller presses analysis and design is urgent. The issues of development of the scientific base for the synthesis of rational layout and design solutions of roller presses taking into account the requirements for the implementation of the technological process of pressing are becoming especially relevant. The paper shows that despite the large number of works devoted to the study of the briquetting process in roller presses, the process of creating a press design is iterative in nature of trial and error. This is due to the multifactorial process and briquetting technology. The main interrelated factors influencing the briquetting process are highlighted. The main components of the system design of roller presses and the system approach to modeling the rational design of these machines using the methods of structural-parametric synthesis and analysis are formulated. The result of structural and parametric synthesis of the rational design of the roller press is presented in the form of tables, graphs, and text files that contain a sufficient set of information for development in automated design systems package of design documentation for the production of the roller press. An approach to the design of roller presses on a modular basis is formulated. An example of generalized decomposition of a roller press design of an Iron & Steel Institute from basic modules is given. The roller presses of the Iron & Steel Institute design basic elements data array have been created, which can be used when creating new modifications of presses on a modular basis. Parameters, target functions, and algorithms for designing roller presses are formulated