Abstract: An experimental study on the durability properties of high volume fly ash (HVFA) concrete that is suitable for channel revetment is carried out. The research on durability properties is under carbonation and drying-wetting cycles coupling effects. Compared with the single damage process, the weights of concrete increase and the relative dynamic modulus of elasticity decrease under coupling effects. And carbonation depths are significantly larger than that of the standard carbonation test. Environmental scanning electron microscope (ESEM) is used to investigate the microstructure variation of HVFA concrete. It is revealed that coupling effects cause some damage to the concretes. The incorporation of fly ash has obvious influence on the weight loss and relative dynamic modulus of elasticity. The carbonation resistance of the fly ash concrete is lower than that of the reference concrete.