Abstract: To produce "sulfur-free gasoline", OCT-ME technology for ultra deep selective desulfurization of FCC gasoline was developed by Fushun Research Institute of Petroleum and Petrochemicals, which consists of FCC naphtha fractionation, LCN (light catalytic naphtha) sodium–free sweetening and fractioning with FCC diesel cut, HCN (heavy catalytic naphtha) hydrodesulfurization over a newly developed ME-1 catalyst. Results of pilot plant research showed that sweetened LCN and FCC diesel cut was easy to be separated through absorption fractionation, the sulfur content of treated LCN was in the range of 4.0—6.0 μg/g; compared with reference catalyst, when using ME-1 catalyst at a reaction temperature of 10 ℃ lower than the base case, at the sulfur content of treated HCN in the range of 5.0—8.0 μg/g, the olefin saturation rate reduced 22.7%—32.1% and the RON loss was 1.3—1.6 units less, which indicated that OCT-ME technology could produce "sulfur-free gasoline" (sulfur content less than 10 μg/g) with less RON loss.