Herein,　the　radiolytic　degradations　of　atrazine　and　cyanuric　acid　were　performed　via　electron　beam　irradiation.　The　results　demonstrated　atrazine　could　be　completely　mineralized　without　any　residue　of　cyanuric　acid　in　aqueous　solution.　The　degradation　of　atrazine　followed　the　pseudo-first-order　reaction　kinetics.　The　studies　in　the　presence　of　different　radical　scavengers　(O-2　and　tert-butanol)　indicated　hydroxyl　radicals　were　the　main　species　for　the　decomposition　of　atrazine　into　cyanuric　acid,　while　e(aq)(-)　played　vital　role　in　the　degradation　of　cyanuric　acid.　During　the　radiolysis　processes　of　atrazine　and　cyanuric　acid,　some　organic　and　inorganic　intermediates　were　detected,　implying　dechlorination,　dealkylation,　and　deamination　occurred.　On　the　basis　of　the　effects　of　radicals　and　detected　products,　the　potential　radiolytic　degradation　pathways　of　atrazine　via　electron　beam　were　proposed.　(C)　2015　Elsevier　B.V.　All　rights　reserved.