Abstract: A series of Al₂O₃, TiO₂-Al₂O₃ and TiO₂-MgO-Al₂O₃ oxides were prepared by the pH swing method and the paralleled flow precipitation method, respectively, and their supported hydrodesulfurization catalysts for the hydro-upgrading of heavy fluid catalytic cracking naphtha were assessed. The characterization results showed that in the binary TiO₂-Al₂O₃ supports, TiO₂ is dispersed on the surface of Al₂O₃ and there is a surface enriching tendency of TiO₂ with the increasing TiO₂ content; compared with binary TiO₂-Al₂O₃ supports, trinary TiO₂-MgO-Al₂O₃ supports have relatively smaller pore volumes and diameters but higher acid amounts. The catalytic assessment results revealed that the catalysts supported on trinary TiO₂-MgO-Al₂O₃ oxides demonstrated better hydrosulfurization performance, and gave a desulfurization ratio of >90% while presenting a lower olefin saturation.