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Platinum nanocubes deposited on glassy carbon (Ptcube/GC) or carbon nanotubes (Ptcube/CNT) were prepared by linear sweep voltammetry.SEM and TEM results show that the scale of Ptcube about 38 nm, which was composed of small particles surrounded by the Pt (111) preferred orientation.Electrochemical investigations including cyclic voltammetry and current time curves, show that these two kinds of Pt cubes exhibit a high catalytic activity and good stability for the oxidation of ethanol than commercial Pt/C.It is worth to note that Ptcube showed an onset potential shifted negatively by 168 mV than commercial Pt/C sample.Electrochemical in-situ FTIR spectroscopy was also used to study the adsorption and oxidation behavior of ethanol in acidic media on Ptcube/CNT and commercial Pt/C,.The results show that negative shift of oxidation potential and increase of catalytic activity on Ptcube/CNT, which are mainly attributing to direct oxidation of ethanol to acetic acid at low potentials.