The　amidoximated　polyacrylonitrile　(PAN)　fiber-Fe　(III)　complex　was　prepared　by　coordination　of　the　amidoximated　PAN　fiber　with　ferric　ions　and　characterized　using　XRD,　FT-IR　and　SEM,　and　then　used　as　the　heterogeneous　Fenton　catalyst　for　the　degradation　of　an　azo　dye,　C.I.　Reactive　Red　195　in　the　presence　of　H2O2　under　light　irradiation.　Two　important　factors　affecting　the　dye　degradation　including　Fe　content　of　catalyst　and　solution　pH　were　investigated　with　respect　of　decoloration　percentage　of　the　dye　in　this　work.　The　results　indicated　that　the　amidoximated　PAN　fiber-Fe　(III)　complex　can　be　prepared　by　coordination　of　the　amidoximated　PAN　fiber　with　ferric　ions　at　room　temperature,　and　increasing　the　number　of　the　amidoximation　groups　of　PAN　fibers　and　concentration　of　ferric　ions　in　solution　lead　to　a　high　Fe　content　of　catalyst.　Increasing　the　Fe　content　of　catalyst　can　greatly　promote　dye　degradation　in　water,　and　catalyst　has　still　high　photocatalytic　activity　on　dye　degradation　at　the　alkaline　medium.