Lithium is the lightest element among the components used for alloying industrial aluminum strained alloys. In addition to low density and increased rigidity, aluminum-lithium alloys have high strength characteristics and resistance to weariness loads. The need to use large-sized rolled or rolled semi-finished products appeared with the development of aviation. Specialists of OJSC «KUMZ» carried out a series of works on the development of a technology for casting a new Al-Cu-Mg-Li-alloy and obtaining large-sized flat slabs from it. The developed alloy has significantly higher properties than traditional alloys. Products from this alloy are an ideal structural material for use in the aircraft industry.