Correlations between nanostructure of AuPd active sites synthesized with different preparation methods and their catalytic activities for the oxidation of alcohols were investigated. The catalytic activity strongly depend on the morphology and Au/Pd molar ratio of the AuPd active site, these were attributed by the differences in preparation methods. The Au_Pd_-PVP/HT catalyst prepared with a simultaneous reduction method exhibited the highest activity for aerobic oxidation of alcohol; ex. TON = 395,700, TOF = 207,000 h^ for 1-phenylethanol oxidation.Characterizations with TEM, XPS, XAFS and other analytical techniques suggested that the highly active Au_Pd_-PVP/HT catalyst possessed uniform AuPd nanoalloys and the largest amount of electrons in Au 5d states. These results proposed that formation of the uniform AuPd nanoalloys allowed a big electron transfer from Pd to Au atoms, and which played an important factor for the significant activity of the Au_Pd_-PVP/HT
