A　large　rupture　strain　(LRS)　fiber　reinforced　polymer　(FRP),　with　a　rupture　strain　value　of　more　than　5%,　is　a　promising　alternative　to　traditional　FRPs　with　a　1-3%　rupture　strain　for　seismic　retrofitting　of　reinforced　concrete　(RC)　structures.　The　LRS　FRPs　provide　a　bilinear　stiffness　around　concrete　columns　while　this　feature　is　linear　for　traditional　FRPs　(e.g.,　carbon　FRP).　This　paper　presents　a　careful　analysis　of　the　compressive　behavior　of　LRS　FRP　wrapped　square　column,　especially　since　their　confining　stress　is　nonuniformly　distributed.　A　total　of　66　square　concrete　columns,　measuring　150　x　150　x　300　mm　with　varied　corner　radii　from　0　to　75　mm　were　tested　under　monotonic　axial　compression.　The　experimental　results,　in　terms　of　full　stress-strain　behavior,　compressive　strength,　hoop　strain　distribution,　and　dilation　behavior　were　systematically　investigated.　As　the　corner　radius　increases,　the　strength　enhancement　after　LRS　FRP　confinement　also　increases,　and　the　hoop　strain　is　more　uniformly　distributed.　The　stress-train　curves　exhibit　a　triple-section　pattern　with　a　smooth　transition　zone.　The　peak　dilation　rate　of　LRS　FRP-confined　concrete　is　higher　than　that　of　traditional　FRP-confined　concrete,　and　the　curve　of　dilation　rate　versus　axial　strain　exhibits　a　remarkably　long　stable　response.　Moreover,　results　show　that　most　existing　models　of　FRP-confined　concrete　can　provide　conservative　predictions　for　an　improved　compressive　strength　of　LRS　FRP-confined　square　concrete　columns.