The effects of shock waves on the structure of amorphous alloys FeBSi,FeMoBSi have been studied by means of X-ray diffraction;the lattice constant of the crystal phase α-Fe was measured.It has been found that its lattice constant becomes shorter than that of pure iron.The experimental results are fitted with theory by using the pair potenial model.It is certain that formation of B-substituted solid solution and omission solid solution would lead to a shorter lattice constant.