Cu-steel　bimetallic　porous　composite　structures　can　be　used　as　lightweight,　damping,　and　electro-conductive　elements　in　critical　environments　where　traditional　single　materials　become　ineffective.　In　the　present　work,　a　novel　Cu-steel　bimetallic　porous　composite　with　a　double-helix　entangled　structure　was　developed.　The　mechanical　properties　(static　stiffness,　loss　factor,　and　tangent　modulus)　of　the　as-synthesized　composite　were　characterized　by　compressive　tests,　and　its　electrical　sensitivity　to　compressive　force　was　examined　by　mechanical–electrical　coupling　tests.　The　effect　of　the　copper/steel　weight　ratio　on　mechanical　and　electrical　performances　was　analyzed　in　detail.　It　is　found　that　the　Cu-steel　bimetallic　porous　composite　with　a　relatively　high　weight　ratio　has　a　larger　average　loss　factor　and　lower　stiffness　than　that　with　a　low　weight　ratio.　The　structural　characteristics　and　complex　microstructural　changes　of　the　deformed　specimen　allow　the　tangent　modulus　and　stiffness　to　exhibit　a　non-proportional　relationship　with　the　weight　ratio　over　a　range　of　displacement.　The　resistance-force　curves　exhibit　an　obvious　nonlinearity　and　degradation　due　to　the　contact　between　internal　bimetallic　wires.　The　resistance-stiffness　history　reveals　that　the　mitigation　of　electrical　conductivity　continued　with　the　enlargement　of　stiffness　and　weight　ratio.　©　2020　Elsevier　Ltd