Lever-type flexure hinge mechanism was usually used to amplify the tiny displacement produced by piezoactuator in the field of precision micro-displacement. The calculation formula of the magnification ratio for lever-type flexure hinge mechanism was deduced by considering the deviation of the rotation center of flexure hinge and it was verified by using the finite element analysis and experiment. The magnification ratios, which were obtained from the formula calculation, the FEM simulation analysis and experimental test, were 8.31, 8.38 and 8.20, respectively. The error between the FEM simulation value and the calculation value was 1% and the error between the FEM simulation value and the calculation value was 1.3%. Therefore, the correctness of the calculation formula was proved.