In　this　work,　red　mud-blast　furnace　slag　(RM-BFS)　based　geopolymers　with　excellent　electromagnetic　wave　absorption　property　is　synthesized　through　the　incorporation　of　wave-absorption　materials.　The　electromagnetic　absorption　property　of　geopolymer　is　characterized　through　the　arched　test,　in　which　the　reflection　loss　of　specimens　is　tested　by　vector　network　analyzer　(VNA).　The　microstructure　and　conductivity　of　geopolymers　are　characterized　through　scanning　electron　microscopy　(SEM),　concrete　porous　structure　analyzer　and　conductivity　tester.　The　crystalline　phase　and　functional　groups　of　geopolymers　are　characterized　by　X-ray　diffraction　(XRD)　and　Fourier　transform　infrared　spectroscopy　(FTIR).　Compared　to　Portland　cement　concrete　(PCC),　wave　absorption　band　of　the　geopolymer　is　wider　and　the　absorption　peak　in　high　frequency　band　is　more　intense.　With　the　optimal　addition　of　hollow　glass　microsphere　(HGM),　Fe2O3　and　graphite　particles,　the　absorption　bandwidth　with　reflection　loss　less　than　−5　dB　are　12.4,　7.7　and　8.1　GHz,　and　the　maximum　reflection　loss　are　−9.4,　−8.4　and　−8.7　dB,　respectively.　This　study　might　give　a　clue　for　preparation　of　geopolymers　with　high　electromagnetic　wave　absorption　properties.　©　2023　Elsevier　Ltd