Abstract: The phenomena of wettability of Co-Cr₃C₂ alloy with WC have been observed by adopting on-the-spot video recording and the structure formed by the infiltration of Co-Cr₂C₃ alloy into WC has been studied by adopting JCXA 733 type electronic probe microanalyser and 3014 type X-ray diffractometer to provide basis for the mechanism of the role of addition of Cr₃C₂ into WC-Co alloy.