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The performance of sulfonamide and macrolide antibiotics in a spiked water removed by O3 and O3/H2O2 was evaluated uder different conditions such as ozone dosage, pH and H2O2/O3 mole ratio. The results showed that O3 and O3/H2O2 were proved to be effective to oxdize sulfamethoxazole of sulfonamides containing the aromatic ring and erythromycin of macrolides, which were built of mostly saturated hydrocarbon structure, and O3 was preferentially to oxidize sulfamethoxazole. With the reaction time of 30 min, when the ozone cocentrations were 2mg/L and 3mg/L, sulfamethoxazole and erythromycin removal efficiency was 93% and 91%, respectively. The sulfamethoxazole and erythromycin were removed completely within 30 min with ozone 6 mg/L. Degradation of sulfamethoxazole containing unsaturated C-C bonds occured easier at low pH only by O3. Degradation of erythromycin with fully saturated structure was difficult, but the improved removal efficiency could be obtained at higher pH. The high concentratins of H2O2 to ozonation was favor to remove those antibiotics. At the 0.5 mole ratio of H2O2/O3 ,the highest removal efficiency could be reached for all the antibiotics .