Abstract: In order to study the seismic vulnerability and influencing factors of continuous rigid frame bridges without cushion cap in deep reservoir areas, a three-dimensional finite element model of a high pier capless continuous rigid frame bridge was established by OpenSees. Additional mass method was used to simulate hydrodynamic pressure, and p-y curve method was used to simulate pile-soil interaction. Then, by randomly selecting 20 near-field seismic waves, the probabilistic seismic demand model of different components of the bridge was established with peak ground acceleration (PGA) as the seismic intensity parameter, curvature and relative displacement as damage indicators. Seismic vulnerability curves were drawn in the meantime. Finally, the effects of the number of tie beams and different pier section forms on the seismic vulnerability of the bridge were discussed. The research results show that the number of tie beams affects the damage location and seismic damage probability of each component of the bridge, so that the number of tie beams should be reasonably set. Compared with the conventional lower structure form (with caps) of continuous rigid frame bridges, capless continuous rigid frame bridges have a lower risk of seismic damage.