The　half-grouted　sleeve　connection　(HGSC)　is　commonly　used　in　precast　concrete　(PC)　structures　due　to　its　convenient　fabrication　method,　however,　the　long-term　mechanical　properties　of　the　HGSC　in　corrosive　environments　remain　unclear.　Therefore,　the　mechanical　behavior　of　HGSC　under　the　coupling　of　sulfate　erosion　and　dry-wet　cycles　(DWCs)　is　investigated　in　this　paper.　A　total　of　24　specimens　with　4d　and　8d　embedded　lengths　were　designed　and　subjected　to　sulfate　erosion　with　different　DWCs.　The　failure　modes　and　mechanical　properties　of　HGSCs　with　different　embedded　lengths　and　DWCs　were　comparatively　analyzed.　Following　this,　a　modified　bond-slip　model　considering　sulfate　erosion　was　proposed　and　validated　against　the　measured　data.　The　test　results　indicated　that　the　failure　modes　of　HGSCs　with　4d　and　8d　embedded　lengths　were　rebar　fracture　and　slip　failure,　respectively.　As　the　number　of　sulfate　erosions　increased,　the　performance　indicators　of　HGSCs　gradually　decreased.　After　180　dry-wet　cycles　(DWCs),　the　average　deformation　and　average　slip　under　peak　load　for　HGSCs　with　an　embedded　length　of　8d　decreased　by　36.6　%　and　37.7　%,　respectively.　In　contrast,　for　HGSCs　with　an　embedded　length　of　4d,　the　corresponding　values　increased　by　3.0　%　and　40.1　%,　respectively.　The　predicted　bond-slip　model　of　HGSC　considering　sulfate　erosion　agreed　well　with　the　experimental　results,　and　it　can　be　useful　in　the　life-cycle　modeling　of　the　PC　structures　with　HGSCs.