The effect of layered double hydroxides (LDH) on the gas separation properties of ethylene vinyl acetate copolymerwas investigated. Mg-Al LDH/EVA nanocomposite membranes were prepared from solution intercalation using organicallymodified LDH (DS-LDH). Dodecyl sulfate (DS)-LDH was obtained by the intercalation of DS anion in theinterlayer. The nanocomposite structure has been elucidated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR)spectroscopy and scanning electron microscopy (SEM). XRD pattern clearly shows that the DS-LDH layers are disorderlywell dispersed in the EVA matrix. The maximum tensile strength and elongation of the LDH/EVA nanocomposite membranewere found with the LDH content 3 wt%. The thermal properties of nanocompostie membrane were enhanced by the incorporationof LDH in EVA matrix. Gas permeation of LDH/EVA nanocomposite membranes with LDH contents of 1, 3,5 wt% was studied for O₂ and CO₂ single gases. The presence of 3 wt% LDH decreased O₂ permeability by up to 53%compared to the EVA membrane. In spite of barrier property of nanocomposite membrane, however, the gas permeabilityfor CO₂ was increased due to its strong affinity with the residual OH groups on the LDH.