To evaluate the aging resistance of fiber material, two aging methods are gradually formed: One Is natural aging methods, namely, the natural environment is directly used to the aging test: the other is the accelerated aging test method, that simulates some aging factors of the natural environmental
conditions to carry on the aging test in the laboratory. Because of the diversity of aging factors and the complexity of aging mechanism, the natural aging is undoubtedly the most important and most reliable test method. But the natural aging cycle is relatively long, differences in years, seasons, region, climatic
conditions led to the non-comparability of test results.