Inert alumina ceramic ball with high strength, stability and thermal stability properties, can resist to high temperature, high pressure and acid, alkali, salt, and various organic solvent corrosion, inert alumina ceramic ball as support and cover material, catalyst in the reactor can buffer into the liquid and gas in the reactor on the impact of the catalyst, protect the catalyst, and improve the distribution of liquid and gas in the reactor.Inert alumina ceramic balls are widely used in petroleum, chemical industry, chemical fertilizer, natural gas and environmental protection industries.