Pd/delta,　O-Al2O3　catalyst　samples　promoted　with　rare　earth　oxides　for　anthraquinone　hydrogenation　to　H2O2　were　prepared　by　impregnating　delta,　O-Al2O3　with　aqueous　solutions　of　rare　earth　nitrate　and　PdCl2　successively.　The　effect　of　the　rare　earth　oxides　on　the　catalytic　performance　of　Pd/delta,　O-Al2O3　catalyst　was　investigated　by　means　of　XRD,　N-2　adsorption　and　H-2-O-2　titration　techniques.　The　results　showed　that　the　rare　earth　oxides　are　good　promoters　of　Pd/delta,　O-Al2O3　for　the　reaction,　and　they　can　inhibit　the　growth　of　alumina　crystals　at　high　temperature,　increase　the　catalyst　surface　area,　improve　the　Pd　dispersion　and　enhance　the　catalytic　activity　effectively.　The　promotion　effect　of　the　rare　earth　oxides　on　the　catalytic　performance　of　Pd/delta,　O-Al2O3　catalyst　for　anthraquinone　hydrogenation　to　H2O2　is　in　the　order　La＞Nd＞Pr＞Sm＞Ce.