Corrosion　of　steel　bars　in　the　marine　environment　is　an　important　reason　to　reduce　the　service　life　of　reinforced　concrete　structures.　In　this　study,　an　amino　alcohol　migrating　corrosion　inhibitor　(MCI)　was　coated　on　the　concrete　surface,　which　was　then　subjected　to　a　simulated　marine　atmospheric　environment　by　carbonation　and　salt　spraying.　The　carbonation　depth,　chloride　concentration　of　concrete,　electrochemical　performance　of　steel　bars　and　mass　loss　rate　of　steel　bar　were　determined　to　evaluate　the　corrosion　inhibition　performance　of　MCI.　NELD-BS610　hardened　concrete　bubble　spacing　coefficient　analyzer　and　scanning　electron　microscopy　(SEM)　were　applied　to　analyze　the　pore　structure　parameters　in　concrete　and　the　corrosion　behavior　of　steel　bar,　respectively.　The　test　results　showed　that　MCI　could　alleviate　the　deterioration　of　concrete　induced　by　accelerated　carbonation　and　chloride　attack,　and　delay　the　carbonation　effect.　After　7　days　of　accelerated　carbonation　and　35　days　of　chloride　attack,　the　carbonation　depth　and　chloride　concentration　of　concrete　coated　with　MCI　were　16.07%　and　16.93%　lower　than　those　of　concrete　uncoated　with　MCI,　respectively.　MCI　could　migrate　to　the　steel　bar　surface　of　steel　bar　to　form　a　protective　film,　significantly　improving　the　electrochemical　performance　of　the　steel　bar,　and　the　inhibition　efficiency　of　MCI　was　about　66.07　similar　to　97.91%.　Besides,　MCI　could　also　reduce　the　mass　loss　rate　of　steel　bars　and　porosity　of　concrete　induced　by　carbonation　and　chloride　attack.　For　the　specimens　coated　with　MCI,　the　mass　loss　rates　of　steel　bar　decreased　by　20.31　similar　to　39.78%,　and　pores　with　sizes　of　1.0　similar　to　0.2　mu　m　in　concrete　reduced　by　59.10　similar　to　76.38%.　The　results　of　this　research　are　purposeful　for　alleviating　the　corrosion　damage　problems　of　reinforced　concrete　in　marine　areas.