Effects of carbon nanotubes(CNT)and alumina(γ-Al_2O_3)supports on the catalytic activities of hydrodesulfurization(HDS)process over Co-Mo catalyst have been studied.XRD results indicated that the main active phases in CNT and γ-Al_2O_3 supported Co-Mo catalysts are MoO_2 and MoO_3,respectively.The TPR results reveal that the reduction peak temperatures of the active species on CNT supported Co-Mo catalyst is lower than those on alumina supported Co-Mo catalyst,indicating that the CNT supports favor the reduction of active species.Catalytic evaluation results displayed that the sulfur content in the reaction products on the CNT supported Co-Mo catalyst is lower than that on the alumina supported Co-Mo catalyst if the HDS reaction was carried out at a temperature above 583 K.