Abstract: Based on the theory of vehicle-track coupled dynamics, a spatial subway train-track coupled dynamic model considering the measured irregularities of rail was established in this paper. Influence of the measured track irregularities on the dynamic performance of the train-track coupled system was analyzed, and then compared with that of the commonly used American AAR6 track spectrum in simulations. The results indicate that the existing simulation used American AAR6 track spectrum overestimates the wheel-rail interaction state and track deformation, but significantly underestimates the vibration of the track system. This highlights the urgent need for research on track spectra that are consistent with the actual conditions of urban rail transit in China. It can effectively improve the accuracy of vehicle-track mechanical performance evaluation, and make our urban rail transit get further development.