In order to assess the effects of the chemical compositions in TNT-containing wastewater on TNT degradation with O₃/H₂O₂,the experiments were carried out with HCO₃^-,NO₃^-,SO₄^-,HCOO^-,Cu²⁺and Al³⁺. Results show that HCO₃^-,HCOO^- and Cu²⁺ can suppress the TNT degradation with O₃/H₂O₂，and their inhibition ability is: Cu²⁺ > HCOO^-> HCO₃^-. Al³⁺ can increase the TNT degradation, and the effects of NO₃^-,SO₄^- on TNT degradation with O₃/H₂O₂ were not found.