Abstract: corrosion experiments of GFRP (Glass Fiber Reinforced Plastic) bars in artificial marine environment of continuous soaking and wet-dry cycling were carried out to study the deterioration mechanism of compressive mechanical properties. The results showed that compressive strength of the specimens decreased linearly with the increase of immersion time and wet-dry cycles during continuous soaking. The environment of wet-dry cycling had more effect on compression performance of GFRP bars than simply chlorine soaking. The effect of alkaline solution on the compression performance was more serious than chloride solution.