Activated Alumina has the advantages of large surface area, many mciro-pores, well disperser, so it has a high affinity for water/ impurity and actived catalyst. According to the applications of balls, there are 3 types of Activated Alumina Sorbent, Activated Alumina Desiccant and Activated Alumina Catalyst carrier. Meantime interior composition of the crystal phase was divided into mode Y and X-P.