A　new　type　of　radially　polarized　grating　is　designed　to　solve　the　problems　of　nonlinear　measurement　of　Faraday　rotation　existing　in　the　power　optical　sensing.　The　distribution　of　the　grating　vector　is　in　accordance　with　the　special　method,　so　that　the　polarization　distribution　of　the　polarized　light　can　be　transformed　into　the　distribution　of　light　intensity,　which　rotates　synchronously　with　polarization　plane.　The　theory　of　polarization　detection　is　analyzed　by　using　Jones　matrix,　and　the　parameters　of　the　grating　are　simulated　by　rigorous　coupled　wave　theory.　Finally,　the　grating　is　fabricated　and　tested.　The　results　show　that　the　TM　transmittance　of　the　grating　is　greater　than　80%,　the　extinction　ratio　is　greater　than　100,　and　the　detection　of　the　polarization　state　can　be　realized.　It　has　the　advantages　of　large　linear　measurement　range　and　measurement　results　independent　on　the　absolute　intensity,　so　that　it　will　be　a　new　detection　technology　of　polarization　based　on　the　image　method.　©　2017,　Editorial　Office　of　Opto-Electronic　Engineering.　All　right　reserved.