Cu-7Cr and Cu-7Cr-0.07Ag in-situ composites were prepared by the cast and thermo-mechanical treatment process. The microstructure, mechanical properties and conductivity of the in-situ composites were investigated by optical microscope, scanning electronic microscope, tensile-testing machine and microhmmeter. Results indicate that the trace addition of Ag can refine primary Cr dendrites and deformed Cr fibre, which leads to a significant increase in strength and slight improvement in conductivity. At the same time, the Cu-7Cr-0.07Ag in-situ composite shows a little higher plasticity