The　Ru/CeO2　catalyst　was　prepared　by　redox　co-precipitation　methods,　including　normal　precipitation,　reverse　precipitation　and　parallel　flow　precipitation.　The　obtained　catalysts　were　characterized　by　N-2　physisorption,　X-ray　diffraction　(XRD),　H-2　temperature-programmed　reduction　(H-2-TPR),　CO　chemisorption,　and　field-emission　scanning　electron　microscopy　(FE-SEM).　The　obvious　difference　of　Ru　dispersion　and　surface　texture　exist　in　the　catalysts　prepared　by　different　methods.　The　activity　test　showed　that　the　ammonia　synthesis　activity　of　the　Ru/CeO2　catalyst　prepared　by　reverse　precipitation　was　12.6%　at　10　MPa,　10000　h(-1),　and　425　degrees　C　which　was　much　higher　than　those　obtained　by　other　methods.　Such　a　high　catalytic　attributes　to　three　facts:　the　easier　reduction,　the　much　higher　dispersion　of　Ru　(45.6%)　and　bigger　surface　area　(120　m(2)/g).