[en] An investigation on the H₂-reduction of granulated W-oxides in the condition approaching commercial practice has been carried out. The effects of major parameters, such as oxide form, the thickness of powder sample, the form of powder boat, and the flow direction of hydrogen etc, on the particle size, size distribution and the BET-S of reduced W-powder were studied. Because the oxides were granulated and the perforated boats were used, the permeability of the powdery oxides will be markedly improved, so, very fine tungsten powder with narrow particle size distribution (e.g. FSSS-d = 0,3, ranging 0,1-0,9 micron) can be produced, and the fine powder productivity can be doubled. Some problems regarding to the reduction mechanism are discussed. 5 refs., 7 figs., 3 tabs. (Author)