To　obtain　the　relationship　between　contact　degradation　status　and　thermal　behavior　of　Gas-insulated　Bus　(GIB),　this　paper　builds　multi-physics　finite-　element　(FE)　model　of　GIB,　then　the　current-carrying　friction　test　platform　of　GIB　contact　is　set　up,　which　is　used　to　carry　out　contact　degradation　test　under　cyclic　load.　Exponentially　weighted　moving　average　(EWMA)　algorithm　is　used　to　extract　long-term　degradation　law　of　contact　and　acquire　resistance　of　GIB　in　multiple　operation　time.　Based　on　the　electrical-thermal-fluid　coupling　model　and　the　long-term　degradation　law　of　contact,　this　paper　analyzes　temperature　rise　characteristic　of　tank　and　contact　under　multiple　operation　time.　The　result　shows　that　there　is　material　transfer　on　the　contact　surface,　and　the　overheating　defect　has　arisen　because　of　the　increase　of　contact　resistance.　In　the　operation　of　1,　5,　10,　20,　40　and　50 years,　the　contact　resistance　are　173　μΩ,　622　μΩ,　690　μΩ,　542　μΩ,　1304　μΩ　and　1220　μΩ,　and　the　contact　temperature　rise　are　33.2　,　66.8　,　71.3　,　61　,　114.2　and　108.2　.　The　research　results　can　provide　theoretical　support　for　life　cycle　temperature　rise　prediction　and　maintenance　of　GIB.　©　2022,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd.