Abstract: The strength and fracture toughness of 2A97-T84 alloy plate after warm compaction（260℃） with different deformation amounts（0%,20% and 25%）were measured by tensile machine and fatigue testing machine. The microstructure and fracture were observed by metallographic microscope, SEM and TEM. The results show that the strength and elongation of the alloy increase first and then decrease with the increase of deformation amount. The σ_b, σ_0.2, δof 20% deformed alloys are 543, 436 MPa and 5.1%, respectively. When the amount of deformation is 25%, the σ_b、σ_0.2 and δ of the alloy are 520,430 MPa and 3.5%, respectively. The fracture toughness of the alloy first increases and then decreases, the maximum fracture toughness reaches 18.56 MPa·m^1/2. The degree of recrystallization is increased by the warm-pressing, and excessive recrystallized grains deteriorate the fracture toughness of the alloy. The secondary phase is broken by the warm-pressing, and the fracture toughness is improved. When the deformation is 20%, the strengthening phase δ’ phase and T₁ phase in the alloy are the most, and the strength can be improved. When the deformation is 25%,recrystallization consumes a large number of dislocation’s energy, resulting in a decrease in the number of strengthening phases and a decrease in alloy strength.