Climate　change　significantly　affects　existing　infrastructure　by　enhancing　the　deterioration　of　concrete　structures.　As　the　number　of　repairs　and　strengthening　increases　during　the　service　life　of　a　bridge,　the　cost　and　environmental　impact　gradually　increase　as　well.　This　study　aims　to　propose　a　framework　with　climate　adaptability　considering　reliability,　environment,　and　cost,　to　realize　the　optimization　of　the　life-cycle　maintenance　strategy　of　bridges　under　climate　change.　In　this　study,　four　preventive　maintenance　and　four　essential　maintenance　of　bridges　were　comprehensively　considered,　and　the　reliability,　environmental　impacts　and　cost　of　the　bridge　at　the　maintenance　stage　were　quantitatively　analyzed.　By　using　the　decision　tree　method,　the　optimal　strategy　of　bridge　life　cycle　maintenance　and　reinforcement　under　climate　change　scenario　was　proposed,　with　the　environmental　impacts,　environmental　cost,　economic　cost　and　comprehensive　cost　as　the　optimization　objectives,　respectively.　Finally,　a　failure　probability　calculation　model　of　emission　reduction　target　of　bridges　was　estimated,　based　on　the　CO2　emission　reduction　targets　by　China　in　the　Paris　agreement.　To　demonstrate　the　applicability　of　the　proposed　framework,　a　typical　highway　bridge　was　taken　as　an　example.　It　can　be　observed　from　the　results　that　the　maintenance　strategies　determined　with　different　optimization　objectives　show　great　differences　in　environmental　and　economic　costs.　With　the　deepening　of　climate　scenario,　the　failure　probability　of　bridge　emission　reduction　of　maintenance　strategies　with　diverse　optimization　objectives　will　increase　by　10%-20%.　The　findings　highlight　the　climate　adaptability　assessment　framework　is　of　significant　for　optimizing　the　maintenance　budget　and　environmental　impact　of　aging　bridge　structures　in　China,　and　is　expected　to　support　decision-making　for　bridge　maintenance　under　the　influence　of　climate　change.