Research conclusions:The erection by swing method is a good way for construction of the bridge above － crossing the busy existing railway．This method has the features of money － saving，practice，safety，reliability，cutting the influence of the construction on traffic and reducing the construction risk，and has a wide applicable prospecting． The design and construction of the swinged continuous beam presented in this paper can provide the important reference to the similar works，especially to the bridge design for passenger dedicated line．