A typical four-span reinforced concrete continuous bridge is employed as examples in this paper， and a plane strain Finite Element（FE）analysis model is developed for three liquefaction pile-ground-bridge sys? tems. Considering the dynamic coupling effect between the pore water and soil particle in the saturated soil，the ef? fect of stone column as a liquefaction countermeasure on excess pore pressure buildup and overall bridge-ground sys? tem seismic response are systematically investigated. In addition，the influences of stone columns on the bridge’s seismic fragility and earthquake hazard curves are explored through constructon of the liquefaction ground–bridge structures. Based on the probability theory，the effect of reinforcement measure using the stone column on the seis? mic risk of the pile-ground-bridge system is established，and the results with/without stone column scenarios are compared. The results show that the stone column has a significant effect on the sand liquefaction. The use of stone columns can significantly reduce the excess pore pressure of soil，thus lowering the bridge-ground system’s overall deformation，seismic vulnerability，and earthquake risk.