Abstract: Aiming at the problem of large RON loss in the production of national Ⅴ standard gasoline from the catalytic cracking gasoline feed with high sulfur content，high olefin content and low aromatic content，solvent extraction and selective hydrodesulfurization combined technology（Referred to as RCDS technology） was developed. The results of the pilot test show that the RON loss is reduced by 0.9—1.9 units when using RCDS technology to process the catalytic cracking gasoline with the above characteristics producing national V standard gasoline compared with the selective hydrodesulfurization technology. Industrial application results show that using this technology to process Qingjiang catalytic cracking gasoline with sulfur mass fraction of 418—460 μg/g, olefin volume fraction of 27.6%—27.9%, and aromatic volume fraction of 19.2%—19.3%，When the product sulfur content is reduced to 7 μg/g，the gasoline RON loss is only 1.0—1.3 units，and the gasoline（C5+）yield is as high as 99.9%.

Key words: FCC gasoline, selective hydrodesulfurization, solvent extraction, combination process