The main purpose of this study is to investigate that when the cotton, PET, and nylon fabric grafting functional-group after irradiation by DV light. According to photochemical principles, Molecular electronic transitions of substrate are caused by the DV radiation, providing the chemical reaction energy required and producing the effect of modification. Traditionally, substrate is modified from the raw material modification and it required to put a lot of cost, time-consuming and the volume of production to reduce costs, but the use of photochemical method take place the modification in the processing stage, and exposure to the different wavelength light sources for modification, and even the surface of the substrate on the functional repaired and customized modification, etc., and it is environmentally clean process, low energy consumption and less air pollution . In the future, photochemical technology can change quality of organic material, giving the chemical modification binding on the side chain-group, and given the use of different materials.