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A kind of CWAO catalyst, RuO2/γ-Al2O3, was prepared by dipping Al2O3 into the aqueous solution of RuCl3.3H2O. XRD, SEM and TEM were used to determine the catalytic structure. Influences of the calcination temperature,the initial pH of the feed solution and degradation temperature on the activity of the RuO2/γ-Al2O3 catalyst were investigated and the reaction mechanism was preliminarily studied. Results showed that uniform dispersion of RuO2 crystallites was observed on the surface of the catalyst. The activity of the catalyst was higher at calcination temperature of 300℃ for 3 h and the particle reunion occurred and some large RuO2 crystallites were abundant at high calcination temperature of 500℃. The activity of the catalyst was better in the acid solution than in the alkaline solution. Increasing degradation temperature and using the catalyst could shorten the induction periods so that the phenol and COD removal were increased. For RuO2/γ-Al2O3 catalyst, the phenol and COD removal were respectively 98% and 80% in a temperature of 150℃, pH of 5.6 and pressure of 3 MPa after a 2 h reaction. This indicated that Ru/γ-Al2O3 catalyst had good activity.