To　reduce　carbon　emission　of　magnesium　phosphate　cement　(MPC),　improve　its　performance　and　promote　the　multiple　utilization　of　brucite　resources,　magnesium　phosphate　cement　was　prepared　by　natural　brucite　(NB)　instead　of　traditional　dead-burned　MgO　(NBMPC),　and　modified　by　ultrafine　metakaolin　(UMK)　and　metakaolin　(MK).　The　effects　of　varying　UMK/MK　on　the　properties　and　reaction　of　NBMPC　were　studied.　The　optimal　combination,　with　10　%　UMK　and　20　%　MK,　resulted　in　a　72　%　reduction　in　carbon　emissions.　This　combination　achieved　the　fluidity　of　155　mm,　final　setting　time　of　33　min,　compressive　strength　of　60.49　MPa　at　28　days,　tensile　bonding　strength　of　3.13　MPa　at　28　days　and　interfacial　flexural　tensile　strength　of　9.56　MPa　at　28　days.　Microscopic　analysis　showed　that　UMK/MK　did　not　change　the　types　of　reaction　products,　and　influenced　reaction　degree　of　NB　and　pore　structure.　The　findings　indicate　that　modified　NBMPC　provides　enhanced　performance　and　environmental　sustainability,　making　it　a　viable　alternative　to　traditional　MPC.