In　this　work,magnesium　phosphate　cement　(MPC)was　prepared　by　natural　brucite　without　calcination.　The　influence　of　molar　ratio　of　phosphate　to　magnesium　(P　/　M)on　the　workability,mechanical　properties,phase　compositions　and　microstructure　of　the　MPC　was　mainly　investigated.　The　results　showed　that　with　the　decrease　of　P　/　M,the　fluidity　of　the　MPC　paste　decreased　gradually,the　setting　time　extended,and　the　compressive　strength　increased　first　and　then　decreased.　When　the　P　/　M　was　1　/　4,the　comprehensive　performance　of　MPC　was　promising,　which　the　fluidity　was　110　mm,the　setting　time　was　7　min,and　the　1　d　and　28　d　compressive　strengths　were　20.　0　MPa　and　43.　7　MPa,respectively.　The　microscopic　test　results　showed　that　the　hydration　products　of　the　MPC　were　MgKPO4·6H2　O　and　Ca10(OH)2(PO4)2　.　After　28　d　hydration　reaction　of　the　MPC,brucite　did　not　completely　reacted.　With　the　decrease　of　P　/　M,the　structural　compactness　of　hardened　matrix　increased,the　total　porosity　decreased.　©　2024　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.