In this study, combined deterioration mechanism in reinforced concrete with CO2, flying salt, acid rain is reconstituted by transient reaction-diffusion equation and super long-term deterioration process is analyzed in RCP scenario.This method is confirmed to be consistent with research of the past about carbonation and to be suitable for complex hysteresis in RCP scenario.Simple formula for building group is also formed and reliability design method with mixture distribution of carbonation in several RCP scenarios is proposed. Probability of carbonation by mixture distribution increases in durable member with thick cover depth after 100 years. RCP 100 1) 40 2),3) 4 DuCOM Lecca CIKS Life-365 Life365 SIMCO STADIUM DuCOM Lecca CIKS Life365 STADIUM * Graduate Student,