Since the species Ga in Ga/HZSM-5 would be converted to Ga₂O₃ and applied to the conversion of n-hexane. The experimen-tal results of the catalytic reaction was compared with those over Ga/HZSM-5 catalyst. The mixture catalyst was also characterized by TEM and TPD analysis. These results were combined together to elucidate the relationship between the acid sites of HZSM-5 and active gallium species. Also, gallosilicate was synthesized by introducing Ga into the framework and applied to the conversion of n-hexane. Investigated here were the BTX selectivity, the influence of the calcination temperature and the effect of Ga-impregnation. This information was then correlated with the catalytic characteristics of gallosilicate to examine the active site for aromatization reaction.