Abstract: The accelerated aging tests of alkali-ultraviolet circulation of glass fiber/epoxy vinlester (GF/EVE) composites used in wind power project were carried out. The change of moisture absorption rate, micro morphology, surface element content, initial decomposition temperature and erosion mass loss rate of the CF/EVE composite samples were investigated to reveal the aging mechanism of GF/EVE composites in alkali-ultraviolet circulation aging and the change of erosion resistance of GF/EVE composites under different cyclic aging cycles. The results show that the coaction of photo-oxidative, hydrolysis reaction and water diffusion causes the surface resin of the GF/EVE composites aging degradation and fiber decomposition and also causes fiber and resin matrix to debond. The breakdown of resin molecular chain and the decrease of resin crosslinking density cause the decline of initial decomposition temperature of resin under circulation aging. The erosion mass loss rate decreases by 2.06% at the first aging cycle and the erosion mass loss rate increases by 32.8% at the end of aging.