Au/OMS-2　catalysts　were　prepared　by　pre-incorporation　(QI),　typical　wet　impregnation　(IM)　and　deposition-precipitation　(DP)　methods.　The　influences　of　prepared　methods　and　conditions　on　the　catalytic　activity　of　CO　oxidation　were　studied.　The　samples　were　characterized　by　X-ray　diffraction　(XRD)　and　Brunaner-Emmett-Teller　(BET).　As　compared　with　pre-incorporation　and　typical　wet　impregnation　methods,　Au/OMS-2-DP　prepared　from　deposition-precipitation　(DP)　method　revealed　the　highest　activity,　due　to　the　largest　surface　area　and　the　smallest　Au　particle　size.　A　study　was　conducted　on　the　effects　of　different　preparation　conditions　(i.e.,　precipitating　agents,　pH　of　solution,　Au　loading　and　calcinations　temperature)　on　the　catalytic　oxidation　of　CO　over　Au/OMS-2-DP.　Effects　of　precipitating　agents　on　catalytic　activity　were　obvious.　The　best　catalytic　activity　was　shown　by　the　Au/OMS-2-DP　catalyst　prepared　with　KOH　as　a　precipitating　agent,　which　could　be　explained　in　terms　of　the　smallest　Au　particle　size.　A　pH　of　9　generated　greater　amounts　of　Au　loading　and　smaller　Au　particles　on　OMS-2　than　other　pH　value.　The　sample　calcined　at　300°C　showed　the　highest　activity,　which　may　be　due　to　the　sample＇s　calcined　at　200°C　inability　to　decompose　completely　to　metallic　gold　while　the　sample　calcined　at　400°C　had　larger　particles　of　gold　deposited　on　the　support.　Au/OMS-2-DP　prepared　from　a　gold　solution　with　KOH　as　a　precipitating　agent,　pH　of　9,　Au　loading　at　5　wt%,　and　a　calcination　temperature　of　300°C　provides　the　optimum　catalytic　activity　for　CO　oxidation,　i.e.　100%　CO　conversion　at　67°C.