The　study　examines　the　effects　of　cold　stretching,　ranging　from　1%　to　7%,　on　the　microstructure,　mechanical　properties,　and　corrosion　resistance　of　Al-Mg　alloy　extruded　profiles.　Microscopic　observations　reveal　that　deformation　introduces　a　high　density　of　dislocations,　substantially　enhancing　the　alloy＇s　strength,　with　dislocation　strengthening　being　the　primary　mechanism.　However,　the　corrosion　resistance　of　the　alloy　decreases　postcold　stretching,　which　is　attributed　to　the　increased　dislocation　density　and　the　proportion　of　high-angle　grain　boundaries,　leading　to　an　increase　in　beta-phase　precipitates　along　grain　boundaries.　The　findings　suggest　that　while　cold　stretching　enhances　the　strength　of　the　alloy,　it　adversely　affects　its　corrosion　resistance.　In　consideration　of　comprehensive　performance,　the　cold　stretching　range　is　determined　to　be　between　1　and　3%.