Dynamic characteristics of bridge structure are critical parameters in evaluating structural total performance.This paper aims to identify parameters of dynamic characteristic such as natural frequency,modal shape and modal damping,through modal-analyzing on the main bridge.According to design information,a theoretical model was built with the finite element analysis software Midas-Civil.A comparison shows that the both are in good agreement.It is carried out that qualitative evaluation of torsional and vertical curved rigidity,symmetry and more physical parameters for the main bridge of Dongjiang Great Bridge.The experimental results can provide basis and references for the rectification of finite element modal and final acceptance of construction,also for the evaluating service behavior and health monitoring of bridge.