Mo-30Cu alloy was prepared by liquid sintering. Microstructures and composition of the alloy were analyzed with SEM, TEM and XRD, and the influence of sintering temperatures and relative density on microstructures and properties of the alloy was studied. The results indicate that the microstructure of the Mo-30Cu alloy is homogeneous, in which are only Mo phase and Cu phase for the alloy; a medium changing zone is between Mo phase and Cu phase. The sintering temperature plays the most important role on the microstructures and properties of the alloy. Relative density and thermal conductivity of Mo-30Cu alloy sintered at 1300 oC are 99.6% and 196 W·(m·K)-1, respectively