A　strip　sub-wavelength　radial　polarization　grating　is　designed　in　this　paper.　It　is　fabricated　by　beam　direct　write　lithography,　which　can　convert　a　rotation　of　polarization　plane　into　the　horizontal　displacement　of　facula　directly,　so　a　linear　measurement　of　rotation　angle　is　achieved　by　locating　the　facula　displacement.　The　grating　consists　of　12　000　units　are　arranged　horizontally,　the　direction　of　the　central　unit　is　0°,　and　the　right　or　the　left　ones　are　rotated　in　turn　by　30＇　in　counterclockwise　or　clockwise　directions　respectively　and　finally　achieve　a　measurement　range　of　±50°optical　rotation　angle.　The　theoretical　model　of　the　grating　is　established　based　on　the　Jones　Matrix,　and　the　relationship　among　the　polarization　characteristics　and　the　grating　ridge　height,　the　period,　the　duty　ratio,　the　incident　light　wavelength,　the　incident　angle,　and　the　temperature　is　analyzed　by　using　the　rigorous　coupled-wave　theory.　The　experimental　and　simulation　results　show　that　the　grating　TM　wave　transmittance　is　greater　than　80%,　and　the　extinction　ratio　is　better　than　26　dB.　It　achieves　the　optical　power　independent　measurement　of　the　optical　rotation　angle,　which　can　be　employed　to　build　a　new　type　of　polarimeter　with　no　mechanical　rotating　device　or　optical　transducers　with　no　rotary　translation　converter.　©　2020,　Science　Press.　All　right　reserved.