In　this　work,　the　degradation　of　carbamazepine　(CBZ)　in　water　by　UV/H2O2　and　UV/Fe(II),　two　UV-based　photolysis　processes,　was　investigated.　The　addition　of　H2O2　and　Fe(II)　significantly　improved　the　CBZ　decomposition　rate　relevant　to　UV　treatment　alone.　For　UV/H2O2　photolysis,　CBZ　photodegradation　followed　pseudo-first-order　kinetics.　The　rate　of　CBZ　degradation　increased　with　the　increase　of　H2O2　concentrations　and　the　decrease　of　initial　CBZ　concentrations.　CBZ　oxidation　rates　in　sea　water　and　surface　water　were　lower　than　that　in　pure　water　and　the　maximum　CBZ　degradation　occurred　at　pH　7.　Additionally,　both　Cl-　and　HCO3　(-)　could　inhibit　the　CBZ　decomposition　in　UV/H2O2　photolysis.　For　the　UV/Fe(II)　system,　CBZ　photodegradation　also　showed　pseudo-first-order　kinetics.　The　results　showed　that　the　degradation　increased　as　the　initial　Fe(II)　concentration　increased　up　to　a　certain　limit　at　which　Fe(II)　reduced　the　degradation　by　scavenging　the　.　O-2　was　favorable　for　CBZ　degradation　in　UV/Fe(II)　process.　Finally,　major　degradation　products　of　CBZ,　including　degradation　intermediates,　organic　acids,　and　inorganic　ions　were　detected　by　LC/MS/MS　and　IC.　Based　on　the　LC/MS/MS　and　IC　analysis,　the　possible　degradation　pathways　of　CBZ　photolysis　were　proposed.　Results　demonstrated　that　UV/H2O2　and　UV/Fe(II)　were　both　potential　technologies　for　water　treatment　containing　CBZ.　However,　considering　the　energy　consumption,　UV/Fe(II)　was　more　efficient　than　UV/H2O2　process　for　CBZ　degradation.