In　order　to　achieve　timely　diagnosis　of　overheating　faults　of　gas　insulated　bus　bars　(GIB),　this　paper　established　a　GIB　temperature　rise　thermal　network　model　including　contact　structure　based　on　thermoelectric　analogy　and　heat　transfer　theory.　The　contact　thermal　resistances　between　the　finger,　the　conductive　rod　and　the　substrate　were　calculated　by　the　disk-　contact　single　heat　flow　channel　model　(CMY　model),　and　the　nonlinear　convective　heat　transfer　resistance　and　the　radiant　heat　transfer　resistance　of　GIB　were　obtained　by　finite　element　numerical　simulation.　The　physical　tests　of　steady-state　temperature　rise　of　GIB　under　different　test　currents　were　carried　out.　The　results　show　that:　under　different　test　currents,　the　calculation　speed　of　thermal　network　method　is　about　34　times　that　of　finite　element　method,　the　maximum　temperature　error　between　the　calculated　and　measured　values　is　9.5%,　and　the　minimum　is　0.2%,　which　verifies　the　thermal　network　model　of　GIB.　This　model　can　be　used　to　quickly　estimate　the　finger　and　shell　temperature　of　GIB,　providing　an　effective　analysis　method　for　GIB　thermal　design　and　temperature　rise　monitoring.　©　2020,　Electrical　Technology　Press　Co.　Ltd.　All　right　reserved.