This work is devoted to the study of the features of computer modeling systems, their analysis and development. The classification of modeling systems is given, the content and possibilities of existing systems are analyzed. Particular attention is paid to the division of all systems into groups according to the logic of construction and functionality. The advantages and disadvantages of the systems of each group are noted. Basic (light) level systems that work in vector space have a closed mathematical model. It is emphasized that the modeling process depends on the considerations of the designer and is reduced to the iterative process of creating a drawing. Features of systems are given and variants of 2-D and 3-D models of real technical units and mechanisms in AutoCAD and Compass-graph systems are given. The systems of the middle group, which are created for 3-D modeling of products and calculations, are considered. Working in such programs, the developer uses electronic copies of real models, which allows you to use the modeling logic of assembly objects. The most complex are the higher level systems used for complex products, which include elements of complex shape and dense layout of a large number of assembly units. The study identified software packages Unigraphics (NX), ProEngineer, Catia, Creo. Complex systems have an open mathematical model of construction and allow end-to-end analysis of the model according to certain parameters. The paper also draws attention to another approach to modeling. So-called PLM and BIM technologies greatly facilitate the process of modeling objects, using a system of well-organized computer models instead of a separate set of drawings. The rapid development of cloud CAD operating in a virtual computing environment is noted. From the made analysis the prospects of further qualitative development of automated systems by parallel development of equipment park together with modeling technology are resulted.