The steel damping composite sliding （SDS） bearing has the advantages of sliding energy consumption， self-reset and good economy. However， the isolation performance of the bearing is still lack of experimental verification of the real bridge， and the influence of different design parameters on its isolation rate is also lack of deep research. To solve these problems， a two span continuous girder bridge was taken as the research object， and the shaking table test of 1∶5 scaled model was carried out. The isolation effect of the high damping rubber （HDR） bearing and the SDS bearing under different intensity earthquake is compared by using the isolation rates of displacement at the top of the pier， shear force in the bottom and bridge deck displacement. The finite element model is also conducted to study effects of yield force， initial stiffness， yield stiffness ratio， damping ratio on the displacement at the top of the pier， shear force in the bottom and bridge deck displacement. Under different types of earthquake， the available parameter range is analyzed. Results show that the isolation rate of the SDS bearing was slightly better than that of the HDR bearing in the longitudinal bridge direction， and close to that of the HDR bearing in the transverse bridge direction， which indicates parameter optimization method is available for the SDS bearing.