The microstructure and texture evolution of electron-beam welded Al-Zn-Mg-Cu alloy were investigated using field emission scanning electron microscopy，transmission electron microscopy and electron back-scatter diffraction（EBSD）.The results indicated that the weld nugget zone was composed of equiaxed grains with an average grain size of 3-8 μm.The second phases are mainly distributed along the grain boundaries.After T6(solution treated and aged） treatment，Most of the second phases in weld nugget were dissolved into α（Al）.The base metal exhibits the typical<111> and<001> fibre textures in extrusion direction，and the sharpness slightly decreased after T6 treatment.No significant texture was observed in the nugget zone.