Through　a　numerical　study,　we　proposed　and　demonstrated　that　the　one-dimensional　periodic　plasmonic-grooves　(1D-PPG)　can　give　rise　to　a　super　chiral　field　inside　grooves　under　normal　illumination　with　off-groove　linear　polarization.　The　handedness　of　the　optical　chirality　of　chiral　field　can　be　reversed　by　modifying　the　incident　polarization　angle　from　+　45　degrees　relative　to　groove＇s　period　direction　to　its　mirror-symmetrical　angle　-45　degrees.　This　makes　possible　a　novel　sensing　scheme　that　utilize　this　polarization-dependent　local　chiral　field　for　circular　dichroism　detecting;　meanwhile,　the　dielectric　environment-sensitive　plasmonic　resonance　of　1D-PPG　can　be　employed　for　refractive　index　sensing.　This　dual-sensing　strategy　offers　great　potential　for　low-cost　chirality　sensing　for　chiral　molecules.