Method of heavily desulfurating and reducing olefinic hydrocarbon for gasoline

The method for further desulfurization and reducing olefine content in the gasoline includes the following steps: cutting the gasoline raw material into light fraction and heavy fraction, making the light fraction undergo the processes of alkali refinement treatment and removing mercaptans, and making the heavy fraction and hydrogen gas successively contact with hydrogenation refining catalyst and octane value restoring agent, then mixing the above-mentioned desulfurized light fraction and heavy fraction so as to obtain the invented gasoline product in which the sulfur content is less than 200 ppm and olefine content is less than 20 V%.