Fire　and　corrosion　change　the　bond　behavior　and　bearing　capacity　of　marine　concrete　structures,　and　the　multi-　hazard　coupling　mechanism　is　unclear.　Therefore,　this　paper　aims　to　establish　the　relationship　between　the　flexural　capacity　and　bond　performance　of　corroded　beams　by　flexural　and　sustained　load　pullout　tests.　Furthermore,　this　study　verifies　the　accuracy　of　corroded　beams　moment　calculation　equation　considering　the　bond　behavior.　The　sustained　load　pullout　and　flexural　tests　are　performed　under　varying　corrosion　degrees.　The　test　results　indicate　that　the　reinforcement　slip　and　mid-span　deflection　of　beams　increase　with　increasing　high　temperature.　Heating　to　800　degree　celsius　results　in　a　slip　of　2.2　mm,　and　the　damage　degree　rises　with　increased　temperature　and　corrosion　degree.　The　damaged　bond　strength　of　corroded　specimens　with　different　temperatures,　embedded　lengths,　and　rebar　diameters　is　subsequently　calculated.　The　influence　coefficient　of　corrosion　and　temperature　on　bond　strength　is　determined　using　the　damage　principle,　and　the　influence　coefficient　of　bond　performance　on　the　moment-bearing　capacity　is　also　calculated.　The　bond　strength　calculation　formula　is　obtained　based　on　the　nonlinear　superposition　principle,　and　a　moment-bearing　formula　considering　bond　performance　under　fire　is　formulated.　Finally,　using　the　finite　element　method,　five　concrete　beams　under　fire　is　simulated,　and　establish　a　nonlinear　spring　to　reflect　the　bond-slip　relationship,　achieving　a　simulated　deflection　check　for　corroded　beams　under　coupling　action　between　fire　and　fatigue　load.　The　finite　element　verification　results　of　corroded　beams　under　fire,　using　the　unified　bond-slip　model,　are　in　close　agreement　with　the　experimental　results.