Grouted　sleeves　are　widely　used　in　precast　assembled　structures.　Many　experiments　show　that　grouted　sleeves　enhance　strength　and　stiffness　in　the　Grouted　Sleeve　Connection　Region　(GSCR)　of　precast　columns.　However,　measuring　the　GSCR’s　shear　strength　is　challenging　in　tests　due　to　sleeve　length,　as　it’s　an　inherent　part　of　these　columns.　Firstly,　the　GSCR　mechanics　model　was　developed　using　Modified　Compression　Field　Theory　(MCFT).　A　shear　strength　calculation　method　for　GSCR　was　also　proposed　by　analyzing　its　cross-sectional　strains.　Subsequently,　the　logic　of　the　calculation　process　was　validated　by　calculating　the　shear　strength　of　cast-in-place　short　columns　and　its　accuracy　was　confirmed　through　finite　element　analysis.　Finally,　the　effect　of　grouted　sleeves　on　GSCR’s　shear　strength　under　varying　axial　compression　and　moment　was　analyzed　using　the　established　computational　method.　The　analysis　showed　that　the　shear　strength　of　GSCR　was　significantly　higher　than　the　shear　strength　normal　concrete　section.　The　grouted　sleeves　bore　most　of　the　shear　force.　The　GSCR　section’s　shear　strength　increased　with　rising　axial　compression　ratio　but　weakened　as　the　bending　moment　grew.　These　findings　offer　valuable　insights　into　the　analysis　of　shear　strength　in　regions　with　grouted　sleeves.　©　The　Author(s),　under　exclusive　licence　to　Springer　Nature　B.V.　2025.