Abstract: Desulfurization tests of FCC light gasoline by extractive distillation were carried out. Optimum desulfurization solvent and the process conditions were selected. Results show that self-made TSJ is the optimum desulfurization solvent. Under the conditions of 2-stages distillation, a TSJ/FCC light gasoline volume ratio of 0.4 and a FCC light gasoline space velocity of 1.5h-1, the sulfur content of treated FCC light gasoline A is dropped from 114μg/g to 48.2μg/g, the desulfurization rate is 57.72% and the yield reaches 99.20%, meeting the sulfur content of National Ⅳ emission standard for gasoline（≯50μg/g）. The sulfur–rich solvent TSJ can be regenerated by N2 tripping. After 5 times of regeneration and desulfurization, the desulfurization rate of FCC light gasoline A is nearly unchanged. Desulfurization of several FCC light gasolines by extractive distillation using TSJ was investigated and high desulfurization rate and high yield can be obtained.