It is necessary to get higherc‐axis alignment of Nd2Fe14B grains in Nd‐Fe‐B magnets for higher‐energy products. During the hot working process, where melt‐spun flakes were hot pressed followed by die‐upsetting, hot‐pressed bodies showed roughly isotropic structure whilec‐axis alignments were developed during die‐upsetting. In this report, we studied the relationship between the reductions during upsetting and the degree of thec‐axis alignments and also tried to get the formula of this relationship. We prepared samples having different reductions and evaluated remanence,c‐axis alignment and strains of each flake in the samples.c‐axis alignments were evaluated using x‐ray diffraction.1Strains were measured using the sizes of each deformed melt‐spun flake. In the range of 50%–70% reduction, remanence was lower in the surface layer than in the center. The difference in remanence in these two regions became smaller as the reduction became larger. The distribution ofc‐axis alignments and strains showed similar phenomena. Then we could propose the following formula showing the relationship between reduction andc‐axis alignment: (&sgr; − &sgr;0)/(&sgr;i− &sgr;0) = (1 − &egr;z)4, where &sgr; is standard deviation ofcaxis alignment and &sgr;0, &sgr;idenotes the &sgr; value at enough large strain and initial value of &sgr;, respectively. &egr;zmeans strain parallel to pressing axis.