Abstract: The hierarchical porous Hβ zeolite with BEA structure was prepared by alkaline treating Hβ zeolite with NaOH solution. The zeolites before and after treatment were characterized by XRD, SEM, N2 adsorption-desorption, NH3-TPD and Py-IR. The FCC light gasoline etherification was investigated in a fixed bed reactor. The results show that alkali treatment can change pore structure and adjust the amount and distribution of acidic sites effectively. As the alkalinity of NaOH solution increases, part of the microporous structure is destroyed, mesopore and acidity increases. At proper alkalinity, with increasing treatment temperature and time, the specific surface area and acid of the Hβ zeolite decrease. At conditions of 0.2 mol/L NaOH solution, 60 ℃, 0.5 h, the micropore structure of the zeolite can be preserved to a maximum extent while the mesopore is formed. The Hβ zeolite treated at this condition has the best catalytic activity.