The　amidoximated　PAN　fiber　(denoted　as　AO-PAN)　and　the　mix-modified　PAN　fiber　(denoted　as　M-PAN)　were　prepared　with　hydroxylamine　and　its　mixture　with　hydrazine,　and　then　used　to　coordinate　with　Fe3+,　respectively,　to　produce　two　Fe-modified　PAN　fiber　complexes　(denoted　as　Fe-AO-PAN　and　Fe-M-PAN,　respectively).　Coordinating　kinetics　of　both　modified　PAN　fibers　with　Fe3+　was　mainly　studied,　and　effect　of　temperature　and　Fe3+　nitial　concentration　on　coordinating　kinetics　were　also　examined.　The　catalytic　activities　of　both　Fe-modified　PAN　fiber　complexes　were　investigated　in　the　oxidative　degradation　of　an　azo　dye　(Reactive　Red　195)　by　DRS　and　ESR　methods.　The　results　indicated　that　within　the　observed　temperature　and　concentration　range,　equilibrium　data　for　the　coordination　of　Fe3+　with　two　modified　PAN　fibers　were　obtained　and　correlated　with　Langmuir　and　Freundlich　isotherm　equations,　and　coordination　kinetics　showed　better　agreement　with　the　Lagergren　second　order　equation.　Fe　coordinating　capacity　and　reaction　rate　constant　of　AO-PAN　to　Fe3+　were　higher　than　those　of　M-PAN　to　Fe3+　at　the　same　conditions,　indicating　that　AO-PAN　reacted　with　Fe3+　more　easily　than　M-PAN.　Two　Fe-modified　PAN　fibers　complexes　have　the　significant　catalytic　effect　on　dye　degradation,　and　Fe-AO-PAN　showed　the　stronger　catalytic　performance　than　Fe-M-PAN　in　the　dark.　Moreover,　catalytic　ability　of　the　Fe-modified　PAN　fiber　complexes,　especially　Fe-AO-PAN　was　remarkably　enhanced　by　light　irradiation.