Supported KVO3 catalysts were prepared by impregnating different kinds of supporters (α-Al2O3, γ-A12O3 and SiO2 powders) with a KVO3 solution. The activity of the bare supporters and supported catalysts were evaluated in a continuous micro-reactivity test unit, with n-butane as a raw material. The results show that KVO3 has no catalytic activity, but it can increase the selectivity to light olefins. The supporter of α-Al2O3 has good catalytic performance for nbutane cracking when the reaction temperature is below 700℃.