Ordered　intermetallic　PtSb　was　synthesized　by　arc-melting　and　then　sintering　treatment.　The　electrooxidation　of　liquid　ethanol　on　PtSb　was　investigated　at　room　temperature　by　cyclic　voltammetry　and　chronoamperometry.　The　results　were　compared　with　those　at　a　polycrystalline　platinum　electrode　surface.　It　was　found　that　at　the　PtSb　surface　the　onset　potential　for　ethanol　oxidation　was　shifted　negatively　over　200　mV　and　the　current　density　at　PtSb　electrode　was　about　six　fold　as　that　at　Pt　electrode.　XRD　and　XPS　technologies　were　used　to　investigate　the　crystal　structure　and　electron　effect.　The　results　of　electrochemical　test　and　ex-site　FT-IR　test　suggested　that　ethanol　decomposition　on　PtSb　favors　the　reactive　intermediate　route　and　the　CO　intermediate　has　less　effect　on　PtSb　than　on　Pt.　Part　of　the　dynamic　parameters　of　the　electrocatalytic　oxidation　of　ethanol　on　Pt　and　PtSb　electrodes　were　obtained　through　the　cyclic　voltammetry　of　different　scanning　speed.　The　electron　exchange　coefficient　(α)　for　C2H5OH　oxidation　on　PtSb　electrode　was　much　higher　than　that　on　Pt　electrode.