The present investigation is concerned to study the prepared of nano composite catalyst of titanium dioxide and carbon nanotube (TiO2/CNT) based on photo-catalysts process. The synthesized composite catalyst was characterized by Brunauer, Emmett and Teller (BET), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), XRF and Raman Spectroscopy. Moreover, the nano composite catalyst was used as a dye to degradation of contaminated water that containing organic pollutants. The photo-catalytic degradation process was carried out at different operational parameters, (Initial concentration of hydrogen peroxide H2O2 of the medium, mixing speed, and flow rate for methylene blue (MB, C16H18N3SCl.3H2O) dye). The nano titanium dioxide / carbon nanotubes (TiO2/CNT) composite showed greater photo-degradation activity under solar and ultraviolet (UV) lamp.