Abstract: The nano- Hβ molecular sieve was prepared by hydrothermal method，and the composite Hβ-Al2O3 alkylation catalysts were prepared by mechanical kneading. The causes of the Hβ-Al2O3 catalysts deactivation were investigated by means of TG, BET, NH3-TPD and Py-IR. The effect of regeneration conditions on the performance of the regenerated catalysts was examined, and the coke combustion kinetics of the deactivated catalyst was also investigated. The results show that the carbon deposition is the main reason of catalyst deactivation, which blocks up the micropores and covers quite a number of moderate intensity L acid center of the catalyst. The suitable regeneration conditions of the deactivated catalyst are: temperature 450 ℃, air flow 50 ml?min-1for the 5mL catalyst tested. Two stages with different carbon removal rate can be seen during the regeneration process and can be described respectively in two kinetic equations.