In　this　study,　the　impacts　of　CO2-absorbed　triethanolamine　solutions　(TEA-CO2)　on　the　mechanical　property,　phase　composition　and　micro-structure　of　cement　mortars　were　investigated.　The　results　showed　that　TEA-CO2　addition　increased　the　1d,　3d,　and　28d　compressive　strength　by　47%,　19%,　and　4%,　respectively,　which　suggests　a　synergistic　effect　of　triethanolamine　and　absorbed　CO2　on　strength　development　of　cement　mortars.　The　enhancement　is　due　to　TEA-CO2　accelerates　hydration　of　aluminate　and　silicate　phases　in　early　age.　TEA-CO2　facilitated　CaCO3　formation　to　increase　cement　hydration　degree　and　modify　the　pore　structures.　However,　the　hydration　of　silicate　phases　was　delayed　slightly　by　TEA-CO2　at　28d.　The　above　results　provide　theoretical　support　for　further　utilization　of　CO2　in　cementitious　materials.