Abstract: The study on the production of superfine FeS₂ powder with grinding mill is carried out due to the wide application of superfine FeS₂.The superfine FeS₂ powder with an average grain size of less than 3 5μm can be obtained after 4 hours of grinding at a pulp density of 50%,ball to material ratio of 5∶1 with the addition of PZ grinding aids.The paper analyzes the dynamics process of superfine grinding of FeS₂ and the relationship between the grain size and energy consumption of superfine grinding product which can be expressed by Charles law.