Abstract A type of aluminum-lithium alloys with high content of Li had been developed to pursuit high specific stiffness and strength using for aircraft lightweight. While the balance of mechanical performance and tailoring mechanism are still important research direction. For a designed novel Al-3.0Cu-2.0Li-0.4Mg-0.4Ag-0.3Mn-0.1Zr alloy, a relationship is given on characteristics of multiple precipitates (T 1 , δ’, θ’) and aging time as well as pre-stretch level. The results show that aging at