The cooling method is a major factor in controlling residual stress, but also has significant influence on y' precipitation behavior and thereby mechanical performance. These effects of cooling rate make residual stress control a more complicated issue for superalloys. Residual stress evolution in a ^150mm 720Li disk during different cooling treatments has been studied by FEM simulation. XRD measurements and contour method were also carried out on the heat treated disk to verify the simulation predictions. Considering the influence of cooling type on residual stress and y' precipitation behavior, a special solid quenching treatment using induction heated dies as heat-transfer medium was introduced to relieve the residual stress and ensure the strength simultaneously.