The　effects　of　silica　fume　contents　on　the　mechanical　properties　and　electromagnetic　transmission　properties　of　sulphoaluminate　cement　were　studied.　The　results　show　that　with　the　increase　of　silica　fume　content，the　compressive　strength　and　flexural　strength　of　sulphoaluminate　cement　increase　first　and　then　decrease，and　the　optimal　content　of　silica　fume　is　10%.　The　electromagnetic　transmission　performance　of　sulphoaluminate　cement　increases　with　the　increase　of　silica　fume　content.　Compared　with　the　sample　without　silica　fume，the　electromagnetic　transmission　property　of　silica　fume-sulphoaluminate　cement　is　improved　in　the　range　of　3.94-5.99　GHz.　The　peak　value　of　electromagnetic　transmittance　is　increased　by　23.9%　at　most.　©　2024　Tongji　University.　All　rights　reserved.