Abstract: Non-eqt ilibrium sintering of nanocrystalline WC/Co powder was processed by laser sintering.The X-ray diffraction,scanning electron microscope and transmiasion electron microscope analyses showed that the original nanostructure feature of WC/Co powder was maintained after sintering;further more,the initial nanocrystaline grains were further refined.After the raw powder with average grain size of 150 nm was sin.tered at laser power of 1 000-1 600W and scan speed of 2-2.5 m/min,the grain size in sintered sample decreased to 3045 nm.