Abstract: In recent years, it has been shown that the ramp bridge has relatively high seismic vulnerability under earthquake. In order to reduce the seismic damage, effective constrainting forms of the ramp bridge should be established. Based on the investigation results of the constrainting forms supported on the continuous girder bridges in the Wenchuan earthquake, 4 different constrainting forms supported on the ramp bridges are established. Taking a ramp bridge in Shijiazhuang as an example, we compare the vibration characteristics and the seismic response of the ramp bridge with different constrains. The results show that the elastomeric pad bearings have a certain shear deformation ability, which could reduce the stiffness of the system of the piers and the bearings. Using these bearings, the seismic force of the upper structure could be effectively distributed which could protect the lower structure, but engineers should also pay attention to the larger beam displacements. Fixed bearings or piers beam consolidation form setting on the bridges will enlarge the pier internal force and increase the damage probability of the lower structure. So it is not suitable to set them on the short piers with higher stiffness. The proposed seismic double-layer stopper and grading limit bearing in this paper have good limiting ability and can dissipate the seismic energy.