Abstract: The texture changes of Al-Mg-Si-Cu alloy sheets which had been preaging treatment after solution were analyzed by means of electron back scattering diffraction (EBSD), the influence of preaging process on the alloy sheets texture was studied. The results show that the texture types basically unchanged and the density of texture changed in the alloys after different preaging treatments. Some texture components appeared such as very weak cube, weak brass B, R/S and the specific Q orientation occurred during rolled at a large reduction with natural aging treatment. Some texture components occurred including very strong G orientation, Q and R/S orientation when preaging at 150 ℃ for 5 min. Some texture components turned up including strong cube (deflection) and Q orientation when preaging at 150 ℃ for 30 min.