In order to study the effects of different pre-deformation on creep behavior and mechanical properties of aluminum alloy, the 2219 aluminum alloy was taken as example.Under condition of 175 ℃ and 180 MPa,creep behavior and mechanical properties of 2219 aluminum alloys with 0 to 8% pre-deformation after creep aging were investigated.The results show that the creep deformation and mechanical properties of materials increase greatly with the introduction of pre-deformation treatment.When the pre-deformation treatment is 1%,the creep deformation of the sample increases by 118% compared with that of the untreated sample.However,as the amount of pre-deformation continues to increase,the mechanical properties of the sample decline rapidly.With comprehensive consideration of creep deformation and the mechanical property,the most favorable pre-stretching for creep aging forming of components is 3%.