Achieving　a　synergistic　balance　between　strength　and　service-related　thermophysical　properties　remains　a　significant　challenge　in　structural　material.　This　study　addresses　this　issue　by　employing　cooperative　heat　treatment　strategies　to　optimise　Inconel-copper　bimetallic　structures　fabricated　via　Directed　Energy　Deposition-Arc　(DED-Arc).　Phase　diagram　calculations　guided　the　design　of　these　heat　treatments.　Comparative　analyses　revealed　that　the　solution　plus　aging　treatment　(STA2#)　achieved　a　balance　between　high　strength　and　ductility　with　a　tensile　strength　of　342.4　MPa　and　an　elongation　of　22.2%,　while　maintaining　excellent　thermal　conductivity.　Digital　image　correlation　revealed　localised　deformation　in　the　C18150　region,　and　the　improved　mechanical　properties　were　attributed　to　grain　boundary　and　precipitation　strengthening.　The　thermophysical　properties　were　significantly　improved　by　the　designed　cooperative　heat　treatment,　with　the　thermal　conductivity　of　the　STA2#　bimetallic　ranging　from　41.16　to　56.08　W/(mk)　over　a　temperature　range　of　30　to　310　degrees　C,　approximately　13%　improvement　than　the　as-fabricated　sample.　This　improvement　in　thermal　conductivity　resulted　from　the　decomposition　of　the　supersaturated　solid　solution.　This　study　provides　a　promising　heat　treatment　strategy　for　advancing　Inconel-copper　bimetallic　in　next-generation　rocket　engine　potential　application.