Abstract: 4A zeolite/TiO2 composite catalysts modified with Ce，Mn and Pt were prepared through impregnation and liquid phase deposition. The prepared catalysts were characterized by SEM，XRD and ICP，and their catalytic performances were evaluated with a self-made fixed bed reactor. Results showed that the catalytic performance of 4A zeolite/TiO2 composite catalyst is evidently enhanced compared with that of 4A zeolite，and the ethylene production is further improved when the composite catalyst is modified with Pt. The composite catalyst modification with Ce and Mn exhibits better catalytic performance than either the one modified with Ce or Mn. The enhanced catalytic performance might be attributed to the increased oxygen vacancies in the composite catalysts by the acceptance of thermal-induced electrons with the supported TiO2 from 4A zeolite.