Abstract: Using NiO prepared by homogeneous precipitation as catalysts to catalytic ozonation for oxidizing bisphenol A in water, and the structure and properties of the catalysts were characterized by XRD, SEM, BET and pore size analysis. The affecting factors such as pH, ozone flow, dosage of catalysts and reaction time on the treatment effect were investigated. The experimental results show that NiO catalyst has a flocculent structure, and the catalyst surface is fluffy and rough. The catalyst has flocculent structure, a fluffy and coarse surface, larger specific surface area with mesoporous structure, which can provide active sites in the reaction. Catalyst has a large specific surface area and a mesoporous structure, which can provide more reactive sites in the catalytic reaction. When the pH solution was 6, ozone flow 10 mg/min, dosage of catalysts 1.0 g/L, reaction time 75 minutes and the initial concentration of bisphenol A 100 mg/L, the degradation efficiency was 95.3 %. Tert-butyl alcohol inhibition experiment indicates that the mechanism of NiO catalytic ozonation for oxidizing bisphenol A in water is mainly hydroxyl radicals produced by ozone's decomposition.