Activated alumina ball has a white spherical appearance, and is porous, non-toxic, odorless, not easy to pulverize, and insoluble in water.Activated alumina ball is widely used in the gas-liquid phase drying and automatic instrument in petrochemical industry and air separation wind drying. Activated alumina ball can selectively adsorb water from gas, steam and some liquids. After saturated adsorption, the water can be removed by heating at about 175-315 ℃ to revive. Adsorption and reactivation can be carried out many times. In addition to being used as a desiccant, this kind of alumina ball can also absorb lubricating oil vapor from polluted oxygen, hydrogen, carbon dioxide, natural gas, etc. Activated alumina ball can also be used as catalyst, catalyst carrier and chromatographic analysis carrier. This kind of alumina ball can be used as a fluoride remover for high fluoride drinking water (with large fluoride removal capacity), a fluoride remover for circulating alkanes in the production of alkyl benzene, a deacidification regenerant for transformer oil, a drying agent for gas drying in the oxygen making industry, textile industry, electronic industry, as well as in chemical fertilizer, petrochemical drying and other industries, a purifying agent, and a pressure swing adsorption dew point up to - 55 degrees in the air separation industry. Activated alumina ball is an efficient desiccant for deep drying of trace water. Activated alumina ball is very suitable for heatless regeneration devices.