Abstract: Influence of feedstock property on the yields and properties of residual oil formed during residue hydrotreating were studied by autoclave, using four residue feeds from different sources under the same reaction conditions. The experimental results demonstrated that feedstocks with higher viscosity and asphaltene content, no matter atmospheric residue (AR) or vacuum residue (VR), exhibited higher conversions, higher yields of gasoline, diesel and coke, as well as lower residual (>350℃) yields. Compared with feedstock, in residual formed by hydrotreating, its saturate content increased while aromatic content decreased. In all the four feedstocks tested, only for Fushun VR having extreme low asphaltene content, in its residual formed by hydrotreating the sum of asphaltene plus coke yield was higher than the asphaltene content in feedstock, which indicated that during hydrotreating reactions, for feedstocks with relative high asphaltene content, the asphaltene species mainly hydrocracked to smaller molecules.