Abstract:The microstructure of copper during the process of continuous extrusion was studied with optical microscopes. The results indicated that grain in pass rolled zone and friction shear zone were stretched along the distortion orientation, the grain in upsetting zone turned into cell, shear bands and substructures were produced in sticking shear zone, the grain became fibrous and experienced a dynamic recrystallization during right-angle bending, the grain experienced a complete dynamic recrystallization and formed into fine recrystallized grain in expansion forming zone.