Abstract: Catalyst supports with a metal wall and a porous layer，were prepared by an anodic oxidation method. The supported Co-Mo/ Al2O3-Al catalysts were obtained by impregnation with ammonium molybdate and cobalt nitrate. The physical structure of the porous anodic alumina was characterized by using SEM and BET. The results indicated that the influences of electrolysis and after-treatment conditions，including electrolyte concentration，hydration time and temperature，and organic addition，on the structure of porous anodic alumina were significant. The pore size and SBET can be adjusted by altering the electrolysis and after treatment conditions. High-porosity and higher surface area alumina supports were prepared via two-step anodization method under the conditions of oxalic acid concentration 4 %，anodic oxidation time 1 h，hydration temperature 80 ºC and hydration time 3 h. The catalysts exhibited considerable selectivity and activity for FCC gasoline heavy fraction hydrodesulfurization.