Pt/SBA-15　catalysts　are　modified　by　cerium　dopant　and　agent.　Experimental　results　show　that　the　catalytic　activities　of　Pt/SBA-15　can　be　deeply　promoted　by　the　introduced　cerium　species,　especially　while　both　cerium　dopant　and　cerium　agent　are　introduced.　The　promoted　catalytic　activities　are　due　to　the　occurrence　of　new　coordination　environments,　promoted　physicochemical　properties　of　Pt　loading　created　by　both　introduced　cerium　species,　and　the　strong　metal-support　interactions　created　by　the　cerium　loading.