Activity　and　stability　of　1%Pd-0.2%Pt/Al2O3　and　1%Pd-0.2%Pt/0.6%Ce/Al2O3　catalysts　prepared　by　impregnation　method　for　catalytic　combustion　of　methane　in　air　were　investigated.　The　catalysts　before　and　after　reaction　were　characterized　by　BET,　CO　chemisorption,　XRD　and　XPS　techniques.　Results　showed　that　the　presence　of　Ce　significantly　increased　the　activity　and　thermal　stability　of　the　Pd-Pt/Al2O3　catalyst　towards　methane　combustion,　which　could　be　attributed　to　more　highly-dispersed　active　PdO　particles　over　the　Pd-Pt/Ce/Al2O3　catalyst　surface　as　well　as　the　retarded　sintering　of　PdO　and　the　maintained　oxidized　state　of　surface　Pd　during　the　combustion　process　in　the　presence　of　Ce.