The Preisach model decomposes the magnetization process into reversible and irreversible parts. In the improved DOK model, it is necessary to model the reversible component separately and add it proportionally to the irreversible component in order to calculate the total magnetization. Many magnetic processes of a magnetic material are simulated by different susceptibility functions. The reversal curves of the twosamples were simulated by the improved DOK model. The study results showed that the parameters embodied the varied magnetic processes of the two samples.