Abstract: As the acid-base salt, moisture, UV light, temperature and other environmental conditions has some influence on the FRP bars, which makes the international long-term performance of FRP international study be more and more concerned. This paper proposes the study of CFRP's durability in the of acid-base erosion using BP neural network method CFRP's. The results show that this method is possible and it can provide theoretical basis for the durability design.