An estimation algorithm was proposed to calculate the displacement field of turbine blade profile during solidification based on reverse engineering in investment casting. Firstly

the turbine blade profile was reconstructed based on measured data from coordinate measuring machine （CMM）. Secondly

two-step match algorithm was employed to calculate the rotating and translating matrixes which were defined as the best space transformation of reconstructed profile to CAD model profile. Thirdly

the normal offset-distance of every node between the reconstructed profile and CAD model profile was calculated to be suggested as displacement of the node

which can be used for accurate modification of sequent mould. The practical validation shows that the method mentioned can achieve the accurate estimation for displacement of turbine blade profile in investment casting

providing a desirable basis for mould modification.