Abstract: We have Synthesized a compound, for which molecular formula is {Mo[S₂CN(C₂H₅)₂]₄}⁺{MoCl₆}^-, and determined its crystal structure by X-ray diffraction method. It is monoclinic, space group P2₁/a, with cell dimensions a = 14.716(6) Å, b = 16.012(6) Å, c= 17.108(9)Å, β = 102.63 (4)° and Z=4. The structure was solved by Patter son method and refined by using the Least-squares method to final consistence factors R= 0.0908, R_w= 0.0761.