Ru+Ba+K/AC　catalysts　with　high　turnover　frequency　were　synthesized　by　co-impregnation　with　Ba(NO3)2　and　the　complex　compound　of　glycerol　and　K2RuO4.　The　turnover　frequency　of　the　prepared　catalysts　is　between　0.87　and　1.30　s-1,　which　is　1.26　to　1.88　times　higher　than　that　of　the　Ru/AC　catalyst　with　RuCl3　as　a　precursor　for　ammonia　synthesis.　The　higher　turnover　frequency　of　the　Ru+Ba+K/AC　catalysts　than　the　Ru/AC　catalyst　could　be　attributed　to　the　higher　absorption　and　lower　activation　energy　of　nitrogen　on　the　Ru　surface　and　the　narrow-sized　distribution　of　Ru　nanocrystals　at　the　reaction　temperature.