Based on the numerical simulation results of ProCAST, an reverse deformation method for investment casting die is presented. The node information is extracted fi rst, and the disordered grids are changed into order ones. The effi ciency of sorting and matching can be improved by the combination of the methods which are used for the simplifi cation of grid fi les and quick sort. And the reverse deformation system of die is built. The example proves the better effect on die design of turbine blade.