In　order　to　study　the　mechanical　properties　and　to　improve　the　connecting　reliability　of　grouted　sleeve　splicing　for　rebars　under　seismic　action,　grouted　sleeve　splices　were　prepared　for　steel　bars　with　a　diameter　of　25　mm　and　28　mm,　respectively.　High　stress　repeated　tension-compression　loading　tests　were　conducted　to　investigate　the　important　indexes,　including　the　failure　mode,　connection　performance,　damage　distribution　of　the　cementitious　grout　and　strain　variation　of　hoop-confinement.　The　test　results　show　that　the　failure　mode　is　fracture　of　the　steel　bar　with　an　embedded　length　of　eight　times　the　bar　diameter.　However,　severe　damage　occurs　at　the　end　of　the　cementitious　grout,　with　the　damage　depth　of　about　8%　of　the　total　length　of　the　sleeve.　The　yield　displacement　of　grouted　sleeve　splices　is　smaller　than　that　of　the　same　type　of　steel.　The　effect　of　high　stress　repeated　tension-compression　loading　on　the　connection　performance　is　not　obvious.　The　indexes　of　yield　ratio,　strength　ratio,　ductility　ratio,　and　capacity　ratio　were　used　to　evaluate　the　connection　performance　of　splices.　The　results　show　that　the　yield　ratio　of　splices　is　greater　than　one　and　the　ductility　ratios　of　grouted　sleeve　splices　are　all　over　four.　However,　the　capacity　ratio　of　splices　of　25　mm　steel　bars　is　only　51%　of　that　of　the　28　mm　bars,　which　may　be　optimized　to　reduce　its　effect　on　the　seismic　performance　of　structural　members.　©　2018,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.