Abstract: Alkylation of benzene with ethanol has been investigated over Fe,Ni,Ti ion exchanged modified HZSM-5 catalysts. The catalysts were characterized by NH₃-TPD,PyIR,XRD,BET,ICP. The Ti loading amount is the most and the Ni loading amount is the least. Modification of Ni enhanced the strong acid and depressed the moderate acid. After modified by Fe the weak and moderate acid increased and the strong acid decreased. With modification of Ti, the weak and moderate acid did not change significantly while the strong acid increased .The ratio of B acid and L acid of Ni-ZSM-5 decreased, the Fe-HZSM-5 and Ti-HZSM-5 increased. The pore diameter of and the BET surface area decreased after Fe and Ti modification. The reaction results showed that the ethylbenzene selectivity of the catalysts decreased a little after modification, while the ethylbenzene yield and benzene conversion increased. In conclusion, the Fe-HZSM-5 and Ti-HZSM-5 were the proper catalysts for the title reaction.