Abstract: Nano-HZSM-5 samples were hydrothermally treated under various temperatures and modified by tetraethoxysilane (TEOS), then a series of Si-ZnO/HZSM-5 catalysts were prepared by stepwise wet impregnation method using zinc nitrate. The effect of hydrothermal treating temperature and silylation on the aromatization of straight-run gasoline over ZnO/HZSM-5 catalyst was investigated. Test results showed that with the increase of hydrothermal treating temperature, the aromatization stability of catalyst increased firstly followed by decrease, which indicated that suitable hydrothermal treating temperature was helpful for catalyst having good activity and stability in the aromatization of straight-run gasoline. Silylation treatment could further improve the aromatization stability of catalyst and reduced the amount of coke deposited on catalyst. However, when the mass fraction of SiO2 on the catalyst was over 12%, a significant decrease of catalyst aromatization performance was observed due to the reduction of catalyst pore size.