From the viewpoint of process speciifcs and thermodynamics, this article has put forward a route for maximiza-tion of low-carbon oleifns via co-processing of methanol and heavy oil. Catalytic cracking experiments on co-processing of methanol and heavy oil at different ratios in a ifxed lfuidized bed reactor had been conducted. Test results have revealed that when 12.5%of methanol was blended to the heavy oil a good products distribution and relatively higher yield of low-carbon oleifns could be obtained. The overall yield of low-carbon oleifns could reach 50.16%, with the yield of ethylene, propylene and butylene equating to 5.47%, 28.93%and 15.76%, respectively.