The span of a cable-stayed bridge is big,the structure is complex,and all members of the structure affect each other.The differential equation of vibration on pre-stressed suspended structures is derived through the theory of D'Alember and factors to affecting the frequency of pre-stressed structure are analyzed.These factors include the section area,elastic modular,length of cable,and mass of whole structure,whereas pre-stress is not inclucled.A way to adjusting the frequency of the cable-stayed flyover is...