Abstract: A series of alumina supported Ni, Mo-Ni and W-Ni catalysts were prepared by co-impregnation and the structure and nickel species were characterized by XRD, TPR and XPS. The effect of additive Mo(W) on catalyst activity for the hydrogenation of olefins in the fraction (boiling spread: 70℃～350℃) was studied. TPR characterization reveals the addition of additives shifts the high-temperature reduced peak to higher temperature but the low-temperature reduced peak to lower one. For the decrease of deoxidizing temperature, the effect of Mo is better than that of W. XRD measurements show that Mo and W increase the dispersion of NiO on the supports in the order of Mo>W. XPS analyse reveals the ratio of surface NiAl2O4 increases due to the presence of Mo and W. The shift of Ni2p3/2 peak indicates a stronger interaction between the NiO and γ-Al2O3 support.