Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to prepare the precursors using sol - gel method. Then, the precursors were calcined in order to make barium hexaaluminate. Factors affecting the material properties of the barium hexaaluminate precursors were studied and they are the kinds and amount of alcohols, and reaction time. In addition, in the course of hydrolysis, the effects of the amount of water, reaction temperature and aging time were also studied in terms of the specific surface area and average particle size of the barium hexaaluminates.