In order to study the function and the application value of iron silicate polymer,a series of experiment were conducted in different ozonation reaction systems for degradation of chloronitrobenzenes(CNBs)in aqueous solution. Static test results showed that the iron silicate polymer was activated in catalytic ozonation for degradation CNBs not only in distilled water,but also in tap water; compared with the ozone alone,in deionized water condition,catalyzed ozonation could make the removal efficiency of oCNB,mCNB and pCNB enhanced by 41% ,39% and 46% respectively; in tap water condition,catalyzed ozonation could make the removal efficiency of oCNB,mCNB and pCNB enhanced by 27%,30% and 27% respectively. In a continuous flow process under the tap water condition,catalyzed ozonation could enhance the removal efficiency of oCNB,mCNB and pCNB by 20% ,24% and 20% respectively. As tert-butyl alcohol can inhibit the efficiency of catalyzed ozonation of CNBs,the mechanism of iron silicate polymer enhanced ozone oxidation of CNBs can be identified as that iron silicate polymer catalyzed ozone to decompose into hydroxyl radicals which further break up the molecule of CNBs.