In this paper magnetization remanence curves were studied for nanocrystalline Pr 8 Fe 87 B 5,Pr 12 Fe 82 B 6 and Pr 15 Fe 77 B 8.Initially the sample was at remanence following saturation along z-axis.After rotating the magnet by 5 n degrees (n =0,1,...,18) a field H was applied along z-axis and then decreased to zero,and the remanence J n r was measured as a function of H.The curves were compared with those calculated based on the nucleation of reverse domain model and domain wall pinning model.The latter model succeeds in simulation much better than the former,and it is concluded that the magnetization reversal is dominated by domain wall pinning for all the samples.The nucleation mechanism contribution,while remains small,increases with the increase of Pr content. In this paper magnetization remanence curves were studied for nanocrystalline Pr 8 Fe 87 B 5, Pr 12 Fe 82 B 6 and Pr 15 Fe 77 B 8.Initially the sample was at remanence following saturation along the z-axis. After rotating the magnet by 5 n degrees (n = 0,1, ..., 18) a field H was applied along z-axis and then decreased to zero, and the remanence J nr was measured as a function of H.The curves were compared with those calculated based on the nucleation of reverse domain model and domain wall pinning model. latter latter model succeeds in simulation much better than the former, and it is concluded that the magnetization reversal is dominated by domain wall pinning for all the samples. nucleation mechanism contribution, while remains small, increases with the increase of Pr content.