Taking the 1^st-class industrial alumina and aluminum oxide as raw material, Calcined Alumina is produced through the unique compound additives technology ,turning phase calcinations in the low temperature, the adopting advanced grinding technology and process ,the product—high temperature micro powder has the characteristics of white powder or fine sand shape epigranular easy to disperse, stable in chemical performance, moderate high temperature shrinkage performance, good sintering performance ,high conversion and low sodium content. Calcined Alumina powder is the basic raw material for heat-resistant ,wear-resistant and corrosion-resistant products, such as high-alumina refractory, high strength ceramic products, car used sparking plug, senior grinding materials and so on.