Fe and Ni nanopowders were prepared in mixture gas of H ₂ and Ar by arc discharge method. High-melting-point metals W and Mo were added to the raw material (bulk Fe or Ni). The structure, morphology and sizes of the nanopowders were analyzed using X-ray diffraction, transmission electron microscopy, BET, oxygen-nitrogen analysis and chemical analysis. The results show the oxide layer of Fe and Ni is destroyed and the temperature of melting sphere of Fe and Ni is increased due to adding high melting sphere of W and Mo, the productivity of nanopowders has been improved by 50%. The mass fraction of W and Mo in the as-prepared samples is only about 0.01%, and the purity of nanopowders is almost unchanged. The average sizes of Fe and Ni nanopowders are slightly increased under the same condition including atmosphere and pressure as well as power when high melting point metal is added into raw materials. The productivity of adding W in the raw materials is higher than that of adding Mo.