The　ultra-high　temperature　characteristics　of　ultra-deep　formation　pose　a　serious　threat　to　the　safety　and　efficiency　of　drilling.　In　this　paper,　we　proposed　a　novel　method　of　dual-channel　drillpipe　for　drilling　ultra-deep　formation.　A　transient　heat　transfer　model　of　dual-channel　drillpipe　drilling　was　established　considering　the　different　heat　transfer　mechanisms　of　different　regions,　combined　with　technological　characteristics　of　dual-channel　drillpipe　drilling　as　well　as　the　variable　mass　flow　of　fluid　at　the　dual-channel　valve.　The　validity　of　the　model　has　been　indirectly　verified　by　the　measured　temperatures　of　a　real　case.　Numerical　simulation　results　showed　that,　compared　with　conventional　drilling　method,　the　dual-channel　drillpipe　drilling　could　reduce　the　bottom　hole　pressure　to　lower　extent　and　reached　a　stable　state　in　shorter　time.　Meanwhile,　the　insulation　effect　of　the　auxiliary　fluid　could　slow　down　the　reduction　in　the　temperature　of　injected　drilling　fluid　and　the　increase　in　the　temperature　of　the　returned　fluid　above　the　dual-channel　valve.　Furthermore,　the　formation　transferred　less　heat　to　the　wellbore　than　conventional　drilling.　Therefore,　dual-channel　drillpipe　drilling　has　the　potential　to　become　an　effective　method　for　drilling　in　ultra-deep　formation　at　ultra-high　temperature.　©　2023　Elsevier　Ltd