The　BaZrO3　material　was　synthesized　by　the　citric　acid　method.　A　series　of　Ru/BaZrO3　catalyst　samples　were　prepared　using　the　above　BaZrO3　calcined　at　different　temperatures　as　the　support.　The　support　materials　and　catalyst　samples　were　characterized　by　X-ray　diffraction　(XRD),　H-2　temperature　programmed　reduction　(H-2-TPR),　CO2　temperature　programmed　desorption　(CO2-TPD),　N-2　adsorption-desorption　isotherms　and　scanning　electron　microscopy　(SEM).　The　results　show　that　the　catalytic　performance　is　greatly　influenced　by　the　calcination　temperature　of　the　BaZrO3　support.　The　highest　catalytic　activity　for　ammonia　synthesis　is　obtained　on　the　Ru-based　catalyst　with　the　support　calcined　at　750　degrees　C.　The　ammonia　concentration　of　RBZ-750　can　achieve　to　9.12%　under　the　condition　of　425　degrees　C,　5　MPa　and　10　000　h(-1).　The　strong　mental-support　interaction　and　electron　conductivity　of　the　support　may　be　the　key　factors　for　the　high　activity　at　low　reaction　temperature.