Abstract: A series of HDS catalysts were prepared using titanium modified cylindrical Al2O3 and SBA 15 SiO2 supports. The active components of Mo, Ni and NiP were loaded on Al2O3 and Ti modified Al2O3 supports. NiP was supported onto the SiO2 and Ti modified SiO2 supports. The influence of titanium modification was investigated on the reduction temperature of the supported active components by temperature programmed reduction (TPR) method. The results show that the titanium modification can lower the reduction temperature of the active components on all catalyst tested. The reduction temperature of NiP on the silica carrier increases significantly compared with that on the alumina carrier. The reason for the lower reduction temperature of active components on the modified catalyst is due to the changes of interaction between active component and carrier by modification of titanium.