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Multi-resonance phenomenon of nanocrystalline iron/paraffin composites is studied based on the general mechanism for each component. Associated with bound relation between the dynamic magnetization and static physical parameters, the relationship between the microwave energy loss and the nature of material is established. It is found that the microwave performance of composites is determined by the competition between natural resonance and exchange resonance, which can be controlled by material's microstructure and geometry features. With this approach, the design of multi-resonance is accessible.