In this article, the author considers the problem of orientation in the large spaces of the library. An analysis of the literature and world experience of designing a visual communication system was carried out. The importance and necessity of designing spatial orientation systems in the architectural space of libraries was considered. Special attention is paid to the main functions, options for use, installation and types of influence on the interior design of modern libraries. Innovative virtual and augmented reality orientation systems in normal and critical situations are considered. It was determined that the means of visual communication in the architectural space of libraries implement a number of basic functions: spatial orientation, navigation, structuring of movement routes, creation of visual style and orientation in critical situations, which collectively makes modern library spaces convenient, flexible, interactive and easy to navigate.