Abstract: Co-gasification of coke and Shengli atmospheric residuum in a fixed bed reactor was performed in the preliminary experimental study. The effects of operating parameters on gaseous products composition and coke formation were investigated. When the mass ratio of oxygen/steam/residuum was set at 0.3/1.0/1.0, pyrolysis temperature set at 800℃, and residence time less than 0.5s, the contents of light olefins (C2H4+C3H6), alkanes(CH4+C2H6) and synthesis gas (H2+CO) were about 24%, 28% and 37%, respectively. The SEM images of the coke formed on the feed coke surfacefrom residuum pyrolysis were observed, and the results showed that the coke formed was almost consumed with blown oxygen. The results of hot simulative experiment further indicated that coke and heavy oil co-gasification could produce light olefins and synthesis gas together, and the coking problem could be solved effectively.