The　application　of　self-healing　property　to　cement-based　materials　promoted　a　long-term　service　time　in　engineering.　In　this　study,　dimethyl　thio-toluene　diamine　(DMTDA)　microcapsules　were　synthesized　successfully　through　melting-dispersion-condensation　techniques,　and　enabled　crack　closure　thus　recovering　the　mechanical　property.　The　as-fabricated　DMTDA　microcapsules　showed　a　core-shell　structure　and　well-dispersed　properties　with　a　tailorable　core　fraction　and　diameter,　(e.g.,　a　diameter　of　312.7　+/-　97.6　mu　m　and　a　shell　thickness　of　15.2　+/-　2.6　mu　m　under　agitation　rate　of　300　RPM).　It　was　found　that　DMTDA　microcapsules　had　a　high　core　fraction　and　good　thermal　stability.　The　introduction　of　microcapsules　decreased　the　flowability　of　cement　paste　but　remained　integral　structures　during　the　mechanical　agitation.　The　increase　of　microcapsule　concentrations　led　to　a　significant　drop　in　porosity　but　a　slight　decrease　in　compressive　strength　of　cement　paste.　Most　importantly,　the　addition　of　DMTDA　microcapsules　and　isocyanates　microcapsules　in　the　cement　paste　could　repair　the　early　hydration　cracks　with　a　size　less　than　100　mu　m,　thereafter　achieving　a　satisfying　recovery　of　the　compressive　strength.