Mechanism　of　accelerated　self-healing　behavior　of　cement　mortars　incorporating　triethanolamine　(TEA)　was　investigated.　The　crack　width　in　cement　mortar　specimens　and　the　healing　efficiency　of　cracks　during　immersion　in　water　were　quantitatively　measured　according　to　the　Poiseuille＇s　law.　To　reveal　the　working　mechanism　of　TEA　in　the　accelerated　self-healing　of　cracks　in　cement　mortars　during　water　immersion,　multi-techniques　including　X-ray　diffraction　(XRD),　thermogravimetry　(TG),　nitrogen　sorption　isotherm　and　scanning　electron　microscopy　(SEM)　were　employed　to　determine　the　changes　in　composition　and　microstructure　of　hydration　products　in　the　presence　of　TEA　before　and　after　water　immersion.　In　addition,　carbonation　process　of　synthesized　CH　powder　was　studied.　Results　show　that　self-healing　of　the　cracks　in　cement　mortars　during　water　penetration　is　a　result　of　the　continuous　formation　of　CaCO3　on　the　fractured　surfaces.　TEA　addition　visibly　enhances　the　self-healing　performance　of　cement　mortars　and　a　higher　dosage　of　TEA　leads　to　a　higher　self　healing　efficiency,　because　of　the　accelerated　precipitation　of　CaCO3　on　the　fractured　surface　in　mortars.　TEA　addition　results　in　great　morphological　changes　and　increasing　the　surface　area　of　portlandite　as　the　second　major　hydration　product　of　cement.　Thus　the　carbonation　process　is　notably　accelerated　in　the　mortars　containing　TEA.　Moreover,　the　TEA-Ca2+complexation　may　promote　the　decalcification　of　C-S-H.