Based　on　the　sol-gel　transition　property　of　sodium　alginate,　a　kind　of　composite　that:　zero　valent　iron　(ZVI)　powder　was　immobilized　on　the　surface　of　SMZ　was　prepared　so　that　the　composite　would　have　both　the　adsorption　capacity　of　SMZ　and　the　reducibility　of　ZVI.　The　composite　was　scanned　by　scanning　electron　microscope,　which　indicated　that　iron　powder　was　uniformly　entrapped　in　a　thin　calcium-alginate　film　on　the　SMZ　surface,　besides　the　film　did　not　impede　the　contact　between　Cr　(VI)　and　SMZ.　The　batch　experiments　aimed　to　test　the　capability　of　removing　soluble　Cr　(VI)　by　the　composite　and　showed　that:　removal　efficiency　of　composite,　SMZ,　ZVI　was74.1%,　38.4%,　9.1%,　respectively.　The　reacted　composites　was　also　scanned　by　X-Ray　photoelectron　spectrometer　(XPS),　it　revealed　that　Cr3+,　Cr6+　were　both　on　the　surface　of　the　composite,　which　verified　the　composite　owned　the　adsorption　and　the　reducing　ability.　The　reaction　between　the　composites　and　Cr　(VI)　can　be　expressed　by　pseudo-second　order　kinetic　model.　The　changing　trend　of　qe　and　k　was　opposite.　The　composite　with　a　5.4%　iron　content　showed　better　performance:　its　qe　was　0.96　mg/g,　and　k　was　0.011　g/(mg·h).　And　it　still　showed　good　performance　when　the　concentration　of　Cr　(VI)　was　70　mg/L.　It　has　a　qe　of　1.29　mg/g,　and　a　k　of　0.0094　g/(mg·h).　©,　2015,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.