Subjected　to　a　corrosive　environment,　the　macroscopic　behavior　of　reinforced　concrete　structures　is　closely　related　to　the　bond　property　between　rebar　and　concrete.　For　assessing　the　material　performance　and　evaluating　the　nonlinear　bond　behavior　of　the　interface　between　corroded　ribbed　rebar　and　concrete,　and　finally　revealing　the　meso-mechanical　failure　mechanism　of　the　reinforced　concrete　structure,　we　propose　a　3D　mesoscopic　model　in　the　current　paper.　The　following　elements　that　may　influence　the　macroscopic　behavior　of　the　reinforced　concrete　are　considered　in　the　model:　(1)　the　friction　resistance　and　the　mechanical　interaction　between　corroded　ribbed　rebar,　rust　and　concrete　(2)　the　surface　characteristic　of　threaded　ribbed　bar.　The　proposed　mesoscopic　model　allows　us　to　assess　the　influences　of　corrosion　on　the　bond　performance　of　corroded　reinforced　concrete　through　a　two-stage　analysis:　after　considering　the　expansive　behavior　of　the　reinforced　concrete　in　the　model,　we　apply　a　pull-out　force　on　the　corroded　rebar　to　evaluate　the　bond-slip　behavior　between　the　corroded　rebar　and　concrete.　For　validating　our　model,　we　compare　the　failure　patterns　and　corroded　bond　stress-slip　curves　calculated　by　the　model　and　obtained　by　experimental　means　and　found　a　good　consistency　between　them.　Finally,　a　modified　model　was　developed　to　describe　the　corroded　bond　stress-slip　relationship.　It　has　been　found　that　when　relative　slip　is　applied,　the　concrete　continues　to　crack　along　pre-existing　cracks　caused　by　corrosion　products　until　the　concrete　splitting　failure　accorded.　With　the　increase　of　corrosion　level,　the　shape　of　the　bond　stress-slip　curve　is　similar　with　a　significantly　degradation　of　the　bond　strength　and　peak　slip,　especially　at　small　corrosion　levels.　Through　comparing　the　proposed　modified　formula　with　the　existing　test　data,　one　can　find　that　the　proposed　modified　formula　can　effectively　characterize　the　corroded　bond　stress-slip　relationship　between　deformed　rebar　and　concrete.