It　was　learned　that　99　%　degradation　rate　of　carbamazepine　(CBZ)　(75　mg/L)　in　solutions　was　got　under　10　kGy　by　EB　(electron　beam)　irradiation　while　15.74%　and　96.02%　CBZ　(2　mg/L)　degradation　rate　was　got　by　UV　and　UV/H2O2　process　in　180　min.　EB-radiolysis　was　thought　to　be　an　efficient　and　energy-saving　method　to　decompose　CBZ　in　comparison　of　energy　consumption　between　EB　irradiation　and　UV/H2O2.　Alkali　metal　cations　which　existed　in　surface　water　have　little　inhibition　on　the　degradation　of　CBZ　under　EB　and　UV/H2O2　process.　The　anions　usually　existed　in　surface　water　had　little　suppression　on　EB-radiolysis　of　CBZ,　while　have　an　inhibition　on　UV-photodegradation　of　CBZ.　Fe3+　promoted　the　degradation　under　EB　irradiation　and　UV　(ultraviolet)　irradiation　because　of　being　the　OH.　promoter.　In　addition,　Fe2+　hugely　enhanced　the　degradation　of　CBZ　under　UV　irradiation.　On　the　basis　of　the　intermediates＇　appearance　during　the　radiolysis,　the　main　degradation　pathway　for　the　mineralization　of　CBZ　was　proposed　under　EB　irradiation.　It　came　to　a　conclusion　that　EB-radiolysis　was　an　efficient　and　energy-saving　method　to　completely　mineralize　CBZ.