Abstract: To produce national phase V gasoline from FCCG, the key operation parameters of the units in the selective hydrodesulfurization process were strictly regulated as a whole, like cutting point, fractionation precision, sulfur content of light gasoline from alkali extraction unit, sulfur content of heavy gasoline from hydrodesulfurization unit. The process adopts the RIPP`s selective HDS catalyst made by the regulation technology (RSAT). The optimal operation conditions are: cutting point is 50-60 ℃ with a mass ratio of 1:4 (light/heavy), mercaptan sulfur in light gasoline from alkali extraction unit is close to nil, sulfur content of heavy gasoline hydrodesulfurized is less than 10 μg/g. The sulfur content of the mixture of alkali extracted light gasoline with selective hydrodesulfurized gasoline is less than 10μg/g. Based on above conditions, the sulfur content can be reduced from 700-853 μg/g in feed to 8-9 μg/g in the product and the gasoline octane number loss is 1.4-1.5. The national phaseⅤgasoline is produced. The successful experience in the production lays a firm foundation for the next step using RSDS-III technology.