In this study is aimed at the sensitivity of ultraviolet to research deeply. Shining the kevlar single fiber, the kevlar yarns and the kevlar fabrics to research the tendency of tension decreasing. And using Xenon arc lamp light to simulate the sunlight is shining the kevlar single fiber, the kevlar yarns and the kevlar fabrics. Comparing the difference of tension each other. In results indicate that strength of shining the kevlar single fiber, the kevlar yarns and the kevlar fabric than Xenon arc lamp light.
