A kind of CWAO catalyst, RuO_2/γ-Al_2O_3, was prepared by dipping Al_2O_3 into the aqueous solution ofRuCl_3·3H_2O. 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 RuO_2/γ-Al_2O_3 catalyst were investi-gated and the reaction mechanism was preliminarily studied. Results showed that uniform dispersion of RuO_2 crystalliteswas observed on the surface of the catalyst. The activity of the catalyst was higher at calcination temperature of 300℃ for 3h and the particle reunion occurred and some large RuO_2 crystallites were abundant at high calcination temperature of500℃. The activity of the catalyst was better in the acid solution than in the alkaline solution. Increasing degradation tem-perature and using the catalyst could shorten the indution periods so that the phenol and COD removal were increased. ForRuO_2/γ-Al_2O_3 ctalyst, the phenol and COD removal wer A kind of CWAO catalyst, RuO 2 / γ-Al 2 O 3, was prepared by dipping Al 2 O 3 into the aqueous solution of RuCl 3 · 3H 2 O. 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 RuO 2 / γ-Al 2 O 3 catalyst were in stirred-gated and the reaction mechanism was preliminarily studied. The activity of the catalyst was higher at calcination temperature of 300 ° C for 3h and the particle reunion occurred and some large RuO 2 crystallites were abundant at high calcination temperature of 500 ° C. The activity of the catalyst was better in the acid solution than in the alkaline solution. Increasing degradation tem-perature and using the catalyst could shorten the indution periods so so the phenol and COD removal were increased. ForRuO 2 / γ-Al 2 O 3 ctalyst, the phenol and COD removal wer