PVP-protected　Cu/Pt　clusters　were　prepared　by　glycol/water　reduction　method　and　characterized　with　transmission　electron　microscopy　(TEM),　X-ray　diffraction　(XRD)　and　absorption　spectra.　TEM　and　XRD　analysis　show　that　the　Cu/Pt　clusters　with　different　molar　ratio　have　fcc　structure　with　particle　size　of　about　4　nm,　while　the　lattice　parameters　in　these　clusters　reduce　with　increasing　Cu　concentration.　From　the　X-ray　absorption　near　edge　structure　(XANES)　at　Cu-K　edge　and　Pt-L-2,L-3　edge,　we　demonstrate　that　the　d-electronic　states　of　Cu　and　Pt　are　affected　by　the　local　environment　as　a　function　of　Cu/Pt　molar　ratio.　With　increasing　Cu　concentration,　Pt　loses　a　fraction　of　5d　electrons　and　the　hybridization　between　p-　and　d-states　at　Cu　sites　is　enhanced.　(c)　2006　Elsevier　Ltd.　All　rights　reserved.