Around the parameter of the blade section shape, the air inlets of blade root are investigated. Firstly, based on the model of recrystallization critical stress for signal crystal alloy, the relationship model between residual stress and optimization parameters is established by the simulation method. Secondary, the detail-structur e with recrystallization is optimized under the constraint conditions of recryst allization critical stress and strength. Finally, through the analysis and comparison of the actual blade, the proposed model is effectively verified. The results show that the max-residual stress is completely reduced by 30%, and the recrystallization is effectively eliminated.