Effect of stress states （tension/ /compression） on creep aging behavior in the process of creep aging forming of 2219 aluminum alloy was studied. The mechanical properties of 2219 aluminum alloy under uniaxial tension/compression were investigated when ageing at 165 to 185℃ by room temperature tensile test. The results show that the optimal creep aging time is 11h. Under the same aging regime， the creep deformation of tensile stress and compressive stress increases with the increase of temperature， and the creep deformation of tensile stress is always greater than that of compressive stress. Regardless of the creep aging under tensile/compressive stress or the conventional aging without stress， the aging properties decrease with the increase of temperature. However， the decrease of properties is most obvious after tensile stress aging. Finally， when the aging temperature is 165℃， all the performance indexes are the best under different stress states.