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Crystallographic structure,magnetic properties,and magnetic entropy change of the Cr-based spinel sulfides Co1-xCuxCr2S4 (x =0-0.8) have been investigated.All these compounds crystallize into the cubic spinel structure,the Cu substitution shrinks linearly the lattice constant at a ratio of 0.0223 A per Cu atom in the unit cell,and enhances linearly the Curie temperature and the spontaneous magnetization at the rates of 18 K and 0.33 μtB/f.u.per Cu atom in the unit cell,respectively.All these compounds show a typical behavior of second order magnetic transition,and a room temperature magnetic entropy change of 2.57 J/kg.K is achieved for Co0.4Cu0.6Cr2S4.