Grouted　reinforcement　sleeve　connection　is　one　of　the　main　methods　to　connect　steels.　In　this　article,　to　investigate　the　mechanical　mechanism　and　behavior　of　grouted　sleeve　splices,　six　large-diameter　grouted　sleeve　splices　were　manufactured.　The　connection　property,　failure　mode,　bearing　capacity,　damage　distribution,　and　hoop　confining　mechanism　were　investigated　through　uniaxial　tensile　test.　The　performance　of　grouted　sleeve　splices　was　evaluated　according　to　several　indexes　of　quantification.　It　was　shown　that　the　tensile　strength　of　the　sleeve　splice　is　equal　to　the　tensile　strength　of　the　steel　bar　with　an　embedded　length　of　eight　times　the　bar　diameter.　Severe　damage　occurred　at　the　end　of　the　cementitious　grout,　with　the　damage　depth　about　8%　of　the　total　sleeve　length.　Based　on　the　test　results,　an　empirical　expression　of　hoop　confining　strain　along　the　axis　direction　of　sleeve　was　proposed.　The　yield　ratio　and　strength　ratio　of　sleeve　splices　meet　the　standard　requirements,　and　the　sleeve　capacity　ratio　varies　with　different　bar　diameter.　The　ductility　ratio　of　grouted　sleeve　splices　was　all　more　than　4%,　which　could　meet　the　earthquake-resistant　need　in　low-moderate　seismic　regions.