hydrodesulfurization catalyst prepared above into the fixed bed reactor the heavy gasoline fraction incorporated with the sulfur rich component is subjected to selective hydrodesulfurization in a condition where a reacting temperature is 260 u00b0 c a reacting pressure is 1 8 mpa a liquid hourly space velocity is 3 0 h u2212 1 and a volume ratio of hydrogen to oil is 500 thereby obtaining a desulfurized heavy gasoline fraction mixing the desulfurized heavy gasoline fraction with the desulfurized light gasoline fraction to prepare a desulfurized gasoline and see table 8 for its composition the method for desulfurization of gasoline as described in this embodiment not only can reduce sulfur content in the gasoline feedstock below 10 ppm but also can control olefin content below 24 and loss of octane number ron is only 0 5 preparing a selective hydrodesulfurization catalyst according to the method described in embodiment 7 whereas the difference lies in that controlling co to have a loading of about 2 on the carrier and controlling mo to have a loading of about 8 on the carrier moreover co and mo which are loaded on the carrier have a mass ratio of 0 25 1 fluid catalytic cracking gasoline from daqing is taken as a feedstock see table 9 for its composition and a process flow of desulfurization of the gasoline feedstock as shown in fig4 firstly fractionating the gasoline feedstock into a light gasoline fraction and a heavy gasoline fraction where a cutting temperature of the.