This research focused on the feasibility and treatment efficiency of Advance Oxidation Process (AOP)-UV/TiO2 for three different kinds of simulated dye wastewater (FBL, FBB and S-RL). The first part of this study investigated the treatment of simulated dye wastewater with UV/TiO2 by changing TiO2 dosages, TiO2 particle sizes and dye concentrations. The efficiency was measured by color removal and TOC removal. The optimum conditions obtained for treatment of different dye wastewater were different. The treatment of Indanthrene red (FBB) by UV/TiO2 was the best, with 99.68% of TOC removal percentage and nearly 100% of color removal while treatment of FBL with 96.11% of TOC removal and almost 100% of color removal. The removal efficiency was lowest for S-RL dye solution with 81.88% of TOC and 95.87% for color removal. Both Langmuir adsorption isotherm and modified Langmuir-Hinshelwood kinetic model (modified L-H model) were fitted to the experimental data and were able to correlate the adsorption patterns and the kinetics of the dyes studied. Since the photocatalysts (TiO2) used were nano-sized powder and is difficult to separate from the wastewater, the second part of this research focuses on the preparation of TiO2-film on glass-substrate and the treatment of simulated FBL dye wastewater by UV/TiO2-film oxidation then followed. The experimental results showed the TiO2-films are suitable only for the dye wastewater treatment in low concentration.