Magnetic analysis of an amorphous alloy magnet with high permeability and with low remanence was made in terms of electron diffraction. This alloy was composed of Co (66), Si (15), B (10), and Fe (9). The surface of the specimen was embedded with alumina particles which were able to give rise to distinct reflections. According to the analysis of the diffraction patterns obtained, the saturation induction of the specimen amounted to about 103G, and its remanence proved to be negligibly small.