Abstract: Influence of high energy ball milling at high temperature on the carbothermal reduction of alumina was studied.The results showed that carbothermal reduction occurred in the process of high energy ball milling at high temperature 600℃ and AlON intermediate phase was formed. After milling, the resultant were reheated to 1250℃ in flowing nitrogen. The reaction rate of the reactants milled at high temperature was higher than that of milled at room temperature.