Texture measurements of the as-received rolled Al-6%Cu-0.4%Zr alloy revealed that a copper component, {311}< 233 >, is developed at the surface and a S component, {631}< 113 >, is formed at the middle of the sheet. During early stages of superplastic deformation at 480 degrees C/5x10(-4) s(-1) the intensity of the Cu component increases slightly whereas the S component changes toward the brass component Bs, {110}< 112 >, by a slip process. For larger strains, both components decrease by a grain boundary sliding mechanism.