Abstract: Alumina carrier was prepared using secondary nano particle self-assembly method and the residue hydrotreating catalysts prepared by impregnation with different contents of active metal using two different dipping methods were investigated. It is found that the pore volume of catalysts prepared through conventional way without complexing agent reduces from 1.2 mL/g to 0.3 mL/g and the specific surface area decreases from 253 m2/g to 55 m2/g and the active metal distribution is not even, as contrast with the impregnation results with complexing agent. Meanwhile the results indicate that the active metal is not evenly distributed on carrier with increasing amount of active metal loading, mainly concentrated and piled-up in smaller pore and on the surface of portion of the large pore. The addition of complexing agent in impregnation step can make active metal evenly distribute.