This　paper　presents　the　different　dispersed　degrees　carbon　nanotubes　(CNT)　on　the　modification　of　magnesium　phosphate　cement　(MPC).　The　dispersion　of　CNT　and　its　influences　on　workability,　mechanical　properties,　hydration　degree　and　pore　structure　of　MPC　as　well　as　the　chemical　interaction　between　CNT　and　MPC　were　systematically　investigated.　It　was　found　that　the　dispersity　of　CNT　increased　with　the　extension　of　sonication　time　in　the　presence　of　sodium　dodecyl　sulfate　(SDS).　When　SDS　added　separately,　which　was　harmful　to　the　mechanical　porosities　of　MPC.　After　CNT　added,　the　negative　effects　that　caused　by　SDS　on　the　properties　of　MPC　could　be　counteracted.　With　the　improvement　of　CNT　dispersity,　although　the　workability　of　MPC　paste　decreased,　the　compressive　and　flexural　strengths　of　MPC　increased.　The　addition　of　CNT　improved　the　hydration　degree　and　optimized　the　pore　structure　of　MPC.　Fourier　Transform　Infrared　Spectrometer　(FTIR)　result　indicated　that　there　was　no　chemical　reaction　between　CNT　and　the　hydration　products　of　MPC.　The　enhancement　in　the　properties　of　MPC　as　a　result　of　CNT　presence　were　mainly　due　to　bridging　effect,　pore-filling　effect　and　nano-size　effect.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.