The main aim of the TUS experiment is to study the Ultra High Energy Cosmic Rays (UHECR) at E ~100 EeV from the space orbit by measuring the fluorescence and Cherenkov radiation of the Extensive Air Showers (EAS). The "Lomonosov" satellite, with the TUS detector on board, was launched on solar-synchronized orbit with altitude of about 500 km on April 28, 2016. It is the first orbital telescope aimed for such measurements. The TUS apparatus structure, methods of UHECR on-line selection and off-line data analysis are briefly presented. The preliminary results of the TUS data analysis are presented.