The　Ru/CeO2　catalyst　was　prepared　by　precipitation　methods,　including　normal　precipitation,　reverse　precipitation,　parallel　flow　precipitation,　and　deposition-precipitation.　The　obtained　catalysts　were　characterized　by　N-2　adsorption-desorption,　X-ray　diffraction,　H-2　temperature-programmed　reduction,　CO　chemisorption,　and　X-ray　fluorescence　spectroscopy.　The　results　showed　that　the　ammonia　synthesis　activity　of　the　Ru/CeO2　catalyst　prepared　by　normal　precipitation　was　11.9%　at　10　MPa,　10000　h(-1),　and　450　degrees　C,　which　was　higher　than　those　obtained　by　other　methods.　The　residual　chloride　content　in　this　catalyst　was　much　lower　and　its　cerium　was　easier　to　be　reduced.　Thus　the　activity　of　the　catalyst　prepared　using　normal　precipitation　was　high.