At present

the commonly used ambient vibration evaluation criteria caused by train vibrating loads is based on the test data and calculation results of a single train

which can not reflect the real vibration situations with multi-tunnels because of the rapid development of rail transit in China. There are four tunnels crossing each other between Hongshan Square Station and Zhongnan Road Station

which are the second line and the fourth line of Wuhan rail transit. The complicated multi-tunnels were simplified as four adjacent perpendicular tunnels with different distances according to its practical characters. Three-dimensional calculation models are established; and ambient vibration and spectrum characteristics are analyzed with different train numbers

different tunnel depths and different tunnel net distances. Approximate empirical formulas are suggested based on the calculation results and the vibration influence areas are determined accordingly. The research results can provide references to forecast and evaluate the ambient vibration for similar projects in future in China