Abstract: Predicting materials' broadband losses accurately is the key to improve their performance and realize the optimal design of power electrical equipment, such as high-frequency transformers, and electrical machines. However, existing hysteresis models are almost mathematical models based on the empirical formulas, which could not illustrate the physical progress of materials' magnetization. Based on the principle of energy-consistence, this paper modified the thermodynamic hysteresis model according to the physical mechanism. Aiming at the fine grain structure of new materials, more pinning sites were introduced, and the calculation method of pinning field's distribution probability with a large number of sites was proposed. Then, the relationship among pinning field strength, reversible field strength, and dynamic field strength was illustrated; while the dynamic and reversible ones were deemed as a whole variant, of which the solution process was deduced. Based on these works, the reversible field strength in different materials was acquired iteratively, and the dynamic hysteresis model was established consequently. The proposed model could identify the dynamic parameters under static magnetic measurement. Finally, the simulation and experimental results about newly developed amorphous and nanocrystalline alloy show that the original model has some defects during new materials' loss-simulated, while the modified one not only has a clear physical meaning but also has high accuracy and practicability.