Analytical reagents have been used for preparation of pure C_3S and its solid solutions containing Fe_2O_3 or FeO. The data from M(?)ssbauer Spectra of samples suggest that 4Si~(4+) are replaced by 4Fe~(3+), 1Ca~(2+) by 1Fe~(3+), and 1Fe~(3+) occupies one octahedron hole; Fe~(2+) mainly replaced Ca~(2+). Spectroscopic Study has indicated there may be extream distortion and higher orientation disorder in (SiO_4) tetrahedron, the reduction of lattice order and translation symmetry by results of ionic replacements of Fe~(3+) or Fe~(2+) in C_3S crystal lattice. Analytical reagents have been used for preparation of pure C_3S and its solid solutions containing Fe_2O_3 or FeO. The data from M (?) Ssbauer Spectra of samples suggest that 4Si ~ (4+) are replaced by 4Fe ~ (3+), 1Ca ~ (2+) by 1Fe ~ (3+), and 1Fe ~ (3+) occupies one octahedron hole; Fe ~ (2+) mainly replaced Ca ~ (2+). Spectroscopic Study has indicated there may be extream distortion and higher orientation disorder in (SiO_4) tetrahedron, the reduction of lattice order and translation symmetry by results of ionic replacements of Fe ~ (3+) or Fe ~ (2+) in C_3S crystal lattice.