The　purpose　of　this　study　is　to　propose　an　efficient　and　economical　organic　triethanolamine-triisopropanolamine　corrosion　inhibitor　(OTTCI)　to　reduce　the　corrosion　of　steel　in　reinforced　concrete.　The　influence　of　OTTCI　on　corrosion　of　steel　in　reinforced　concrete　under　the　coupling　effect　of　freeze-thaw　cycles　and　chloride　attack　(FTCs-CA)　were　characterized　by　electrochemical　impedance　spectroscopy　(EIS),　dynamic　electrode　potential　(PDP),　mechanical　properties　(mass　loss　rate　(M),　compressive　strength　(fn)　and　relative　dynamic　elastic　modulus　value　(Pi)),　capillary　water　absorption　(CWA),　bubble　spacing　coefficient　(BSC)　and　scanning　electron　microscope　(SEM).　The　inhibition　mechanism　of　OTTCI　was　also　analyzed　and　summarized.　The　results　displayed　that　the　dosage　of　OTTCI　delayed　the　degradation　of　reinforced　concrete　under　FTCs-CA.　After　150　cycles,　the　M　value　of　specimens　with　1.0　%　OTTCI　reduced　by　66.31　%　compared　to　that　of　specimens　without　OTTCI,　the　Pi　value　increased　by　51.9　%,　and　the　polarization　resistance　and　corrosion　inhibition　efficiency　reached　2744.19　Ω　cm2　and　92.88　%,　respectively.　In　addition,　OTTCI　significantly　reduced　the　CWA　value　and　porosity.　After　150　cycles,　the　CWA　and　porosity　with　1.0　%　OTTCI　decreased　by　60.1　%　and　54.54　%　respectively.　The　capillary　water　absorption　coefficient　increased　linearly　with　the　increase　of　FTCs-CA.　SEM　tests　illustrated　that　OTTCI　inhibited　the　development　of　internal　cracks　and　macropores　in　concrete　and　promoted　the　formation　of　hydrated　calcium　silicate　gels　and　calcite.　The　application　of　this　study　not　only　provides　a　new　method　to　alleviate　the　deterioration　of　reinforced　concrete,　but　also　offers　theoretical　and　technical　support　for　further　investigate　on　the　deterioration　characteristics　of　reinforced　concrete　in　harsh　environments.　©　2024