Ru/CeO2　catalysts　were　prepared　using　K2RuO4　and　Ce(NO3)(3)　as　the　raw　materials　by　redox　methods.　The　obtained　catalysts　were　characterized　by　N-2　physisorption,　X-ray　diffraction　(XRD),　field-emission　scanning　electron　microscopy　(FE-SEM),　CO　chemisorption　and　temperature-programmed　reduction　(H-2-TPR).　The　Ru/CeO2　catalyst　prepared　by　self　redox　co-precipitation　has　the　largest　surface　area　of　120　m(2).g(-1)　and　the　highest　dispersion　of　45.6%.　The　Ru/CeO2　catalyst　prepared　by　self　redox　co-precipitation　shows　the　best　activity,　the　ammonia　concentration　in　the　exit　gas　reaches　12.6%　under　the　conditions　of　10.0　MPa,　425　degrees　C,　and　10000　h(-1).