Аннотация:The pioneer space fluorescence ultra high energy cosmic rays (UHE CR) detector TUS, is preparing in SINP MSU, Russia. The main goal of this project is study of cosmic rays beyond GZK cut-off (50 EeV). It consists of segmented Fresnel–type mirror concentrator (area 1.86 m2 , focal distance 1.5 m) and photo receiver (256 pixels – PMT R1463). Total FOV of detector is 9 × 9 degrees. Developed electronics allow events measurements in various time scales, and provide PMT gain control to operate with any atmosphere UV background. Night atmosphere radiation depends mainly on moon phase and atmosphere air-glow and was studied in "Tatiana-1" and "Tatiana-2" experiments. The electronics of TUS were tested in space conditions during these experiments. Recently, detector TUS was included into "Mikhailo Lomonosov" satellite scientific payload. This satellite should be launched at the end of 2011 in honour of Russian scientist and founder of Moscow State University M.V. Lomonosov. TUS will study various extreme phenomena which produce UV light in the atmosphere (UHECR, transient luminous events) and will be a "pathfinder" for further projects (JEM-EUSO, MEMS Space Telescope).