Abstract: In order to investigate the effects of wet dry cycles in salt solution conditions on the interfacial bonding property of carbon fiber reinforced polymer(CFRP)-concrete, this paper adopted 5% NaCl solution to simulate seawater environment.After different times of wetting drying cycle, the single shear test was used to study the changes of 48 specimens' interfacial properties.The effects of the above mentioned environment condition on the types of interfacial bonding failure, interfacial capacity and interfacial shear stress were analyzed. The test results show that after wet dry cycles in salt solution, the interface bonding property will be significantly degraded.With the increase of cycle times, the interfacial capacity that is related to the strength of concrete and the CFRP size continues to decrease. Although the interfacial shear stress distribution under different environmental conditions all expresses as the transmission from the loading end to the free endas the load increasing, the effective bonding length does not change during the whole transfer process.