Liquid phase photografting of acrylic acid(AA) was carried out onto poly(ethylene terephthalate) films and fabrics on which benzophenone(BP) had been previously coated. The effects of various reaction conditions were investigated. As Ah concentration was increased, the yea yield was increased up to a specific value and then decreased, and the even of BP concentration showed the same tendency. It was also found that the graft yield increased with UV irradiation time and reaction temperature. The effect of dissolved oxygen in the reaction solution, photoyafting without using a photosensitizer, pre-irradiation photografting method and the kinds and concentrations of solvent on the graft yield were investigated. The changes in hydrophilic properties, dyeability, thermal properties and morphology of grafied films and fabrics were compared with the original samples.