The thermal behavior of transformation and characteristics of seeded sample powders prepared by simultaneous $alpha$-Al2O3 seed addition with water on the Al-sec-butoxide hydrolysis were studied. $alpha$-Al2O3 seed particles are shown to act as nuclei for transformation of $ heta$-to $alpha$-Al2O3 and to result in an increase in thetransformation kinetics and lowering of the transformation temperature by as much as 143$^{circ}C$. Simultaneous seed addition on the hydrolysis resulted in uniform dispersin and creation of nucleation site on seed surface and only 0.1wt% seeding lowered the transformation temperature by as much as 115$^{circ}C$. For 3wt% seed addition, $alpha$-Al2O3 single phase was obtained at 95$0^{circ}C$ for 100 minutes and the specific surface area of products were lowered to 11.9$m^2$/g as compared with that of $alpha$-Al2O3 powder prepared without seed at 115$0^{circ}C$ ; 15.1$m^2$/g due to depression of vermicular structure growth.