The effect of cold working on the aging behaviors and mechanical Properties of the Al-2Li-3Cu-0.12Zr alloy have been studied. This results show that the formation of T₁ and θ′ phases are accelerated by introduction of 5% cold rolling after as-quenched state two step aging treatment is most effective in aging response and impact energy increase among tested conditions. This results are attributed to the two step aging treatment which has the more dense and homogeneous distribution of strengthening phases such as T₁ and θ′. It is thought to be due to the participation of lithium to the formation of T₁ phase in early stage of aging treatment.