The　influence　of　ultrasonic　and　three　types　of　chemical　surfactants　(including　cationic　surfactants:　CTAB,　anionic　surfactants:　SDS,　and　nonionic　surfactants:　TX-405)　on　the　dispersion　of　CNTs　was　investigated.　The　techniques　include　UV-Vis-NIR　spectrophotometer,　laser　particle　size　analyser　and　scanning　electrical　microscope　(SEM).　The　results　show　that:　1)　Ultrasonic　leads　to　a　dispersive　effect　on　CNTs　in　water,　and　the　optimal　ultrasonic　time　is　120　s;　2)　Three　types　of　surfactants　have　positive　effects　on　the　dispersion　of　CNTs　in　water,　among　which　cationic　surfactant　(CATB)　leads　to　the　best　dispersibility;　3)　CNTs　with　more　carboxyl　groups　show　better　dispersion　in　water　indicated　from　UV-vis-NIR　spectra　and　particle　size　measurement;　4)　The　optimum　concentration　of　surfactants　is　5:　1　(the　mass　ratio　of　dispersant　to　CNTs);　5)　Three　types　of　surfactants　can　improve　the　dispersion　of　CNTs　in　cement　pastes　indicated　from　SEM　images　at　the　optimum　dosage.