Abstract: As a new type of urban rail transit, the low\|medium speed maglev has little documentation on field measured results of vehicle\|rail coupling interaction. By analyzing the field measured vibration data of track\|bridge system of Changsha Maglev Express in speed\|raising test, the results show that the vibration of track\|bridge system gradually attenuates with the increase of propagation distance, and the attenuation from sleeper end to rail support is the most significant. There is a ′path blocking′ effect of rail row joint on the vibration propagation from sleeper to rail support, which is mainly reflected in the frequency range below 20 Hz. Type Ⅲ joint section with sleeper measuring point of 2~200 Hz vibration component is larger than rail row middle section. The dominant frequency band of measuring point vibration at rail support is 63~125 Hz. Under the operating condition of design speed of 100 km/h, the environmental vibration source intensity Lvl，z，max of type Ⅲ joint section and rail row middle section become 81.4 dB and 81.1 dB respectively, and both are 84.2 dB when the speed is raised to 150 km/h. The environmental vibration source intensity shows a significant linear relationship with the running speed, and the source intensity can be calculated according to the Lvl，z，max-v expression given in this study.