Abstract: A systematic study was conducted on the durability performance degradation laws of Carbon Fiber Reinforced Polymer (CFRP) plates under various harsh environments, aiming to address the critical challenge of long-term durability assessment for CFRP in civil engineering applications. By simulating typical service environments such as natural climate, accelerated aging, and typical environment such as corrosion of organic acids produced by plants and animals, the performance degradation patterns of CFRP materials under different environmental conditions were quantitatively analyzed using a combination of peak load-bearing capacity tests and mathematical model fitting. The research results indicate that CFRP materials exhibit significant time-dependent strength degradation under all tested environmental conditions. After 28 days of aging, the residual strength retention rates were 79.6% for specimens in natural outdoor environments, 75.1% for those in artificial accelerated aging environments, while specimens immersed in a strong acidic environment with pH=1 showed a dramatic reduction to just 65.3% after only 7 days. By establishing a linear relationship model between residual strength and the logarithm of aging time, quantitative degradation coefficients for different environmental conditions were obtained. This study establishes for the first time a predictive model for CFRP strength degradation that encompasses natural climate, accelerated aging, and chemical corrosion environments, clarifying the quantitative relationship between environmental types and performance degradation rates. It provides important theoretical foundations and data support for accurately evaluating the long-term performance evolution and predicting the service life of CFRP-strengthened structures in complex environments.