Abstract: The microstructure evolution and hardening behavior of CH2696 alloy with aging hardening by different heat treatment scheme are studied. The results show that the supersaturation of CH2696 alloy matrix increases with the increase of solid solution temperature. In 1100 ℃ 2 h solution-treated CH2696 alloy the γ′phase precipitates adequately in 780 ℃ 16 h aging process, and the hardness increases significantly. The low temperature at 650 ℃ 16 h aging treatment plays the role of supplementary aging, it HBW hardness number is 350.