CO_2 concentration enrichment induced by climate change will enhance the deterioration of reinforced concrete (RC) structures. The influence of climate change on the reliability of reinforced concretestructure undercarbonization was analyzed based on the environmental conditions specified in the "Code for durability design of concrete structures". Consider of climate change, the average carbonation depth is increased for 20%-40%, and the reliability is decreased. It is predicted that, by 2100, the provisions specified in the code for I-A and I-B environment conditions would not satisfy the demand of structure durability.