oly(lactic acid) (PLA), the ?rst melt-processable synthetic ?bre produced from annually renewable resources. The effects of exposure to UV/Ozone, on the surface modification and dyeing properties of poly(lactic acid) (PLA) and poly)ethylene terephthalate( (PET) fabrics were studied. Two different surface treatments were investigated: 1)UV/Ozone irradiation on dry fabric(dry method). 2)UV/Ozone irradiation on distilled water, hydrogen peroxide, hydrogen peroxide/sodium silicate impregnated fabrics(wet method). The results show that UV/Ozone treatment of the PLA and PET fabrics improved wettability, created oxygen-containing moieties at the fibre surface, and resulted in etching and roughening of the surface. . The untreated and the treated PLA and PET fabrics were dyed with two, Black and Blue, disperse dyes, to investigate the possibility of achieving deep dyeing of the fabrics treated with wet method. The results show that the UV/Ozone treatment reduces the samples? reflectance values in all wavelengths.