The moisture absorption has influence on the mechanical properties of fiber reinforced composites. In this study, we investigate th effect of degradation in various aqueous environment and intermittent drying on the mechanical properties of E-glass fiber reinforced composites. The tensile strength is measured using strand specimen with 40~50wt. % E-glass fiber content and the fracture surfaces are also observed by scanning electron microscope(SEM). The results show that the decreasing tendency of tensile strength as a function of immersion and drying time are similar to the behavior of samples immersed in aqueous environment.