The complex of Cu(Ⅱ) with 4-(4′-pyridyl)-1,3-dithiole-2-one was synthesized in ethanol,and it was characterized by IR,elemental analysis and X-ray diffraction method.X-ray single crystal analysis reveals that the crystal belongs to triclinic,space group P-1,and it is a binuclear complex which consists of two CuSO4,four C8H5NOS2 ligands,two H2O ligands and six free H2O molecules.The complexes linked by the S…S contacts form two dimensional sandwich structure,and further form steady three dimensional structure by intermolecular hydrogen bonding interactions.