In this study，the Dongting Lake Bridge II was chosen as engineering background to investigate the effects of the central buckle on the end displacement of suspension girder. Considering the geometric nonlinear effect，three finite element models of the suspension bridge were established. Based on the FE model and considering multiple driving conditions, the effect of central buckle on the dynamic characteristic of the suspension bridge and end displacement under vehicle excitation was investigated. It is shown that the central buckle can significantly increase the stiffness of the suspension bridge，and it seems to govern the longitude modal displacement at the end of the girder. Moreover, the transient analysis was performed to investigate the vehicle-induced dynamic response of the suspension bridge. Furthermore, the effects of the central buckle on the longitude modal displacement in the end of girder were evaluated. The results show that the central buckle can be designed to decrease the peak value of the dynamic response of the girder. However, it increases the cumulative displacement at the end of the girder.