A new type of sweetening catalyst was explored for removing high molecular weight mercaptan in hydrogenated gasoline. The effects of reaction temperature，catalyst concentration and mercaptan structure on mercaptan conversion were studied. The results showed that in a certain range, the catalytic activity can be increased by rising the reaction temperature and the concentration of catalyst. The lower molecular weight mercaptans and n-thiols could be easily oxidated than the contrary mercaptans. The novel catalyst could effectively oxidize the mercaptans to disulfides. The mercaptan concentration in gasoline could be reduced from 100ug/g to less than 5ug/g , and the Doctor Test became negative.