Abstract: The authors study the online-booking process, the subject of the study is an information system of network of cinemas. Based on the analysis of the existing information system network of cinemas the authors define the requirements for the system on-line ticket booking. The online booking module, implemented by means of the PHP, MySQL database and CSS, has the following functionality: the possibility to book tickets for the movie sessions (up to 6 tickets); displaying the date of a movie session with the day of the week as additional information; displaying the time of the end of a movie session, for the convenient of time planning for cinema audiences; showing the genre of the film, its duration and age restriction; presenting special offers and the average ticket price; previewing  the occupancy of the cinema hall, without going to a separate Web page. The authors used by the method of deduction in which the conclusion on a common set of features is made based on a variety of partial signs. The authors also analyzed the existing module of online tickets booking of UCS Premiera. Developed online booking module was integrated with the information base cinema (1C: Enterprise). The booking system was tested during three months and then implemented in the "Planeta Kino" network of cinemas. Implementation of the online booking module enhances the role of the client's participation in the work of cinema, thus allowing the system to refer to the level of CSRP-Systems.