Electron　beam　(EB)　degradation　of　perfluorooctanoic　acid　(PFOA)　and　perfluorooctane　sulfonate　(PFOS)　in　aqueous　solutions　was　studied.　It　suggested　that　PFOA　and　PFOS　degradation　followed　the　pseudo-first-order　kinetics,　and　degradation　rates　increased　with　increasing　initial　pH.　Radical　scavengers＇　experiments　indicated　that　hydrated　electron　and　hydrogen　radical　were　important　in　the　electron　beam　degradation　of　PFOA　and　PFOS,　especially　hydrated　electron.　The　decomposition　efficiencies　were　95.7%　for　PFOA　and　85.9%　for　PFOS,　by　EB　irradiation　in　an　anoxic　alkaline　solution　(pH　=　13).　The　potential　degradation　pathways　of　PFOA　and　PFOS　by　electron　beam　irradiation　through　defluorination　and　the　removal　of　CH2　unit　were　proposed.