Nanostructured W-La 2 O 3 composite powder was prepared by the high energy ball milling,or mechani ca l alloying(MA).Serially W-La 2 O 3 electrode materials were fabricate d by hot pressed sintering in vacuum .In each case the nanostructural evolutions was observed as function of milling tim e and sintering temperature using SEM,XRD and TEM.The results show that the si ntering densification depends on nanosize particle rearrangement ra sther than c onventional diffusion.The enhanced sinterability of MA W-L a 2 O 3 composite powder is attributed to their ultra-fine and homogeneously mixed state,high internal strain,as well as the sintering activation by impurity ele ments.