To investigate the influences of pumice chemical surface properties on catalytic ozonation, the decomposition rate of ozone in water was measured over pumice and the mechanism of ozone catalytic decomposition was discussed. The results showed that the pseudo-first order rate of ozone decomposition increased by 37.4 ％ for pumice catalysts. When t-BuOH was added, the rate constant decreased by 45.2 ％ for pumice catalysts, suggesting that the decomposition of ozone followed the mechanism of hydroxyl radical (·OH). The removal of ozone increased with the increasing of surface hydroxyl groups. High initial pH presented a positive effect in the ozone alone and ozone/pumice system. The pumice surface at nearly zero charged point was favorable for the decomposition of ozone in aqueous solution. Ozone aqueous decomposition in the presence of pumice takes place mainly on the natural material surface. The presence of metal oxides in pumice might catalyse ozone decomposition into more active radicals.