Abstract: The subject of this article is to increase the level of automation of engineering design in CAD systems. The object of study are gears and links in engineering products. The relevance of the work is due to the need for integrated solutions aimed at reducing the amount of work and time spent in the design and simulation of gears and links in engineering products in order to improve the efficiency of engineering design. The author focuses on the problem of increased complexity in the design of gearing profiles. The article describes the general methodology for modeling parametric libraries in the design of gears and links in engineering products. The main result of the work is the developed methodology for modeling parametric libraries of gears and links. The technique is presented in the form of a phased sequence of actions, divided into eight stages. In the development process, we used the method of parametric modeling of gears and links and the method of direct programming in CAD.