The　corrosion　problem　of　steel-reinforced　concrete　(SRC)　columns　in　coastal　areas　is　becoming　increasingly　severe　and　needs　to　be　solved　urgently.　This　study　established　a　numerical　analysis　model　for　SRC　middle-length　columns　considering　corrosion　effects.　The　bond-slip　constitutive　relationship　between　corroded　steel　and　concrete　was　established.　It　was　found　that　when　the　rust　rate　is　low,　the　bonding　stress　of　SRC　columns　is　slightly　increased　compared　to　those　without　corrosion.　The　ultimate　and　residual　bonding　stress　will　decrease　significantly　when　the　rust　rate　exceeds　1.5%.　The　comparison　between　the　numerical　analysis　model　and　the　experimental　results　shows　that　the　establishment　of　the　model　is　reasonable.　Subsequent　parameter　analysis　showed　that　for　corroded　SRC　mid-length　columns,　the　larger　the　slenderness　ratio　of　the　component,　the　faster　the　decrease　in　axial　compression　performance.　The　rust　rate　increased　from　0　to　30%,　and　the　axial　compression　performance　of　SRC　columns　decreased　significantly.　When　the　rust　rate　exceeded　30%,　the　axial　compression　performance　of　concrete　columns　tended　to　stabilize.　A　formula　for　calculating　SRC　middle-length　columns＇　ultimate　bearing　capacity　considering　corrosion　effects　has　been　proposed.