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In this article,the FCC diesel fuel is chemically treated with GZ reagent.The existent gum,insolubles after oxidation,and iodine munber are greatly reduced after chermical treatment.This method has a good effect and is simple.This method is characterized by high recovery rate of fuel(>99.7?and low cost.The property of the mixture of chemically treated diesel fuel with straight-run diesel fuel can meet the requirements of national standard GB252-2000.The color and oxidation stability of the mixed fuel after having been stored for three months were still lower than the values specified in the national standard.