ArapidandsimplewaytoprepareporousFe2O3/Fe3O4@carbonoctahedronarrayedonthree-dimensionalgraphenefoam(Fe2O3/Fe3O4@C/G)nanocompositeswasdeveloped.Firstly,Fe-metalorganicframeworks(MOFs)/grapheneoxide(GO)precursorwasfabricatedbygrowingoctahedralFe-MOFsonthesurfaceofGOandthentheas-preparedFe-MOFs/GOwasrapidlytransformedintoporousFe2O3/Fe3O4@C/Gbycombustingthemixtureofprecursorsandtriethylamine(TEA)inair.Inthecombustionprocess,GOwasreducedandconnectedeachotherintoN-dopedGfoam,andFe-MOFsweretransformedintoporousFe2O3/Fe3O4@CoctahedronandarrayedonGfoam.Theporousstructure,porouscarbonandGfoamrelievedthevolumeexpansionofFe2O3/Fe3O4nanoparticles,andenhancedelectricalconductivityofnanocomposites.Theas-preparedFe2O3/Fe3O4@C/Gshowedahighdischargecapacity(1210mAhg?1,200cycles)andlongcyclelife(5?A?g?1,400cycles)whenwasappliedtolithium-ionbatteries.ThisworktoprepareFe2O3/Fe3O4@C/GnanocompositesthroughthecombustionofTEAandFe-MOFs/GOcouldsaveenergy,achieverapidpreparationandshortenthereactiontime.Itmightprovideanoriginalwayforfabricationoftransitionmetaloxides@CderivedfromMOFsandaconstructiveviewintothepreparationofcompositematerials.