Fire　accidents　will　cause　deterioration　of　the　mechanical　properties　of　steel　and　concrete,　which　will　affect　the　bond-slip　behavior　of　the　interface　between　steel　and　concrete.　In　this　work,　in　order　to　further　understand　the　relationship　between　bonding　performance　of　reinforced　concrete　and　temperature,　a　central　pull-out　test　by　the　three-dimensional　(3D)　mesoscale　numerical　model　was　established.　The　surface　shape　of　deformed　rebar　and　the　heterogeneity　of　concrete　were　considered　in　the　model.　The　effectiveness　of　the　mesoscale　model　was　verified　against　with　the　available　test　results.　Moreover,　the　bond　failure　mechanism　between　deformed　rebar　and　concrete　was　discussed.　Subsequently,　the　influence　of　thickness　to　diameter　ratio,　elevated　temperature　and　cooling　down　on　the　bonding　behavior　was　discussed　using　the　mesoscale　numerical　model.　The　results　show　that　the　failure　mode　and　the　bond　stress-slip　curve　of　the　specimen　are　obviously　related　to　the　ratio　of　thickness　to　diameter.　The　bond　strength,　slip　and　bond　stress-slip　curve　of　the　specimen　at　high　temperature　are　significantly　different　from　those　after　cooling　down　according　to　the　experimental　and　numerical　results.　The　influence　of　temperature　on　bond　strength　is　greater　than　that　on　slip.　Finally,　on　the　basis　of　the　existing　theoretical　model　of　bonding　behavior　at　room　temperature,　a　calculation　method　that　can　predict　the　bond　stress-slip　curve　at　elevated　constant　temperature　is　proposed.　The　calculation　results　are　compared　with　the　simulation　and　test　results　to　illustrate　the　validity　of　the　prediction　formula.