The rapid development of automobile and the greatly increased consumption of fuel have caused more and more serious air-pollution by the emission of tail gas[1,2]. To reduce the emission of tail gas from gasoline-powered engines, governments all over the world have tightened regulations on the composition of gasoline and required the production and use of clean fuels via the reduction of sulfur and olefins in gasoline. A new standard of the composition of gasoline will soon become effective in our country in which the content of olefins must be under 35% (volume fraction, the same below)[3]. However, approximately 80% of gasoline used in our country comes from FCC gasoline which contains olefins more than 50%. To decrease the content of olefins in gasoline, several measures have been developed, such as optimization of the FCC process, use of new FCC catalysts (GOR, LBO, RFG), hydrogenation, and so on. But the degree of reduction of olefins is not high (only by 6%～13%), and always accompanied by octane value decreasing. Therefore, it is urgent to develop a novel technique that can maintain the octane value while reducing the olefins in gasoline.