The　Au/FeO3　catalyst　for　water-gas　shift　reaction　was　prepared　by　coprecipitation　method.　Under　vigorous　stirring,　the　aqueous　solution　of　HAuCl(4)(.)4H(2)O　and　Fe(NO3)(3)(.)9H(2)O　was　firstly　mixed,　then　the　aqueous　mixture　and　the　aqueous　solution　of　Na(2)CO(3)(.)10H(2)O　were　simultaneously　added　dropwise　to　deionized　water　at　60degreesC　kept　through　flowing　water　and　at　a　constant　pH　value　adjusted　by　diluted　Na2CO3.　The　brown　suspension　was　kept　under　stirring　for　desired　time.　After　cooling　to　room　temperature,　the　resulting　precipitate　was　alternatively　centrifuged　and　washed　until　no　AgCl　precipitate　was　noted　on　dropping　AgNO3　solution　into　the　filtrate.　Further,　the　paste　was　dried　at　120degreesC,　then　heated　to　desired　temperature　at　a　heating　rate　of　5　degreesC/min　and　calcined　at　the　corresponding　temperature　for　desired　time.　The　effect　of　the　preparation　parameters　was　systematcally　explored　on　the　WGS　reactivity.　The　results　showed　that,　some　preparation　parameters,　such　as　gold　loading,　precipitant,　precipitation　manner,　pH　value　during　precipitation,　calcination　atmosphere,　temperature,　etc,　can　exert　much　influence　on　the　catalyst　activity.　The　gold　introduced　by　coprecipitation　can　highly　disperse　on　the　surface　of　Fe2O3　support.　Moreover,　the　nanometer　gold　particles　can　depress　the　crystallization　of　the　support　and　significantly　reduce　the　reduction　temperature　of　the　support　toward　Fe3O4.　The　high　catalytic　activity　of　Au/Fe2O3　catalyst　under　low　temperature　can　be　attributed　to　the　synergism　between　nanoscale　gold　particle　and　Fe3O4　phase,　while　the　latter　still　works　at　high　reaction　temperature.　If　the　aggregation　of　the　nano-scale　gold　particles　occurs,　the　catalytic　activity　decreases.