The efficacy and the affecting factors of ozone oxidization for TNT-containing wastewater were studied. The related experiments were carried out by inletting continuously O₃ into the water under the conditions that the affecting factors were controlled in levels. The concentration of TNT and the COD value of the wastewater were monitored during the process of oxidization. The reactions involved in the wastewater treatment include direct and indirect oxidization ones. The former consists of the reaction between O₃ and the pollutants,while the latter is the one of hydroxyl radical with the pollutants,which is caused by O₃. Both of the reaction′s contributions to the degradation of TNT depend on the pH value of wastewater. During the ozone oxidization of TNT,trinitrobenzene-like by-products (except TNT) were formed and accumulated in the wastewater with pH below 8,but in the wastewater with pH=11,these by-products were not monitored. Rising pH,lowing TNT concentration and adding pH buffer are useful measures to increase the TNT removal efficiency by ozone oxidization. Therefore,ozone oxidization process is expected to be suitable for treating the TNT wastewater with higher pH and lower concentration of TNT.