The article describes the use of complex software “UFOModeler” to build simulation models of operating systems of different nature. The introduced software system is a promising instrument for construction of simulation models of objects. Model operation of the facility represents a system-object model in terms of the "Node-Function-Object" graphic-analytical approach, which in turn implies the description of the object being modeled as a system consisting of subsystems and which is part of a super-system. We consider two examples of construction of models of functioning of technical systems: a technical production line of plastic containers, as well as a line on the synthesis of modified nanocrystalline hydroxyapatite. We provide: a description of technical devices that make up the modeled object; the development process of the graphic-analytical structural system model; the processes describing the behavior of certain technical devices.