To improve the transverse seismic capacity of continuous skewed girder bridges with elastomeric pad bearings and reveal their transverse seismic behaviors under different design parameters, the OpenSees was used to establish a three-dimensional finite element model of a typical continuous skewed girder bridge, while considering the sliding effect of elastomeric pad bearings, the hysteretic mechanical properties of reinforced concrete retainers, and the abutment-backfill interaction. The transverse seismic performance of the bridge was investigated for different combinations of retainer strength and gap. The results indicate that with an increase of both retainer strength and gap, the displacement of the bearings decreased in the transverse direction, but increased in the longitudinal direction. The transverse displacement of the main beams decreases with an increase of retainer strength. The increase of the plane rotation angle of the girder is detrimental to the shear safety of the bearings at the both sides of abutments. With greater strength and smaller gaps of retainers, the pier columns are more likely to be at an elastoplastic stage. In this paper, all the seismic performance indices of the modeled bridge satisfy the requirements in the design codes with a retainer strength of 40% of the reaction force and gap of 0.08 m.