In order to make sure the mechanism of the dynamic modulus of the thermosetting epoxy asphalt mixture(EAM) for steel bridge pavement, and to establish its master curve, the dynamic modulus of EAM was tested and analyzed based on the simple performance test(SPT), and compared with the dynamic modulus with other two ordinary asphalt mixtures. According to the time temperature superposition theory, the dynamic modulus master curve of the EAM was established through a least squares regression analysis. The result shows that dynamic modulus of the EAM is significantly larger than the other two mixtures, on the other hand, the dynamic modulus of EAM decreases with the temperature increasing and increases with the frequency increasing. At last, the dynamic modulus master curve of EAM at 20℃ is established. The master curve can provide material parameter to the dynamic design and analysis of the epoxy asphalt pavement on steel bridge deck.