The purpose of this study was to investigate the changes in the property of nylon fabrics dyed with safflower red and yellow colorants under Ultraviolet(UV)-light. For this purpose, nylon fabrics dyed with safflower red and yellow colorants were compared with each other after uv-light exposure in terms of K/S value, color changes(△E), morphology, and strength retention. K/S value rapidly decreased with inceasing exposure time, but K/S value of the samples dyed with safflower red colorants decreased less than that of samples dyed with safflower yellow colorants. In color changes, as increasing exposure time, L* increased, a* decreased, b* increased, and so △E increased in samples dyed with safflower red colorants. In color changes, as increasing exposure time, L* increased, a* and b* increased, and thereby △E increased in the samples dyed with safflower yellow colorants, indicating fading away by uv-light and changes of hue, value and chroma value.