Abstract: The coked zeolite catalyst FX-02 used in synthesis of ethylbenzene with dry gas of FCC (Fluid Catalytic Cracking) was studied by TPO（Temperature　Programmed Oxidation） experiment, by which the coked catalyst was regenerated. The acid properties of the regenerated catalyst were investigated by NH3-TPD(Temperature Programmed Desorption) and compared with the fresh catalyst. Pore structures, activity, crystal phase and specific area were also studied. The components of the coke on the catalyst were analyzed by GC/MS(Gas Chromatography/Mass Spectrometry). The experimental results illustrated that the coke deposited on the active site center of the catalyst led to the catalyst deactivation and could be burned out when the temperature was over 300 ℃. The coke was most compatibly burned at 500 ℃～550 ℃ and burned off completely at 600 ℃. It was also shown that the acid sorts and proportion can be restored completely through regeneration at 550 ℃. The percentage of restored acid amount exceeded 95% and the crystal and the pore structure were nearly as same as the fresh catalyst. The assessment of intrinsic activity of the regenerated catalyst was satisfied by compared with that of the fresh catalyst.