A slope seawall project is near a bridge,and may have a negative impact on the bridge.We analyze two typical sections of excavation and cement mixing pile by a three-dimensional finite element model established by Plaxis 3D,and obtain the maximum displacement results of bridge pile foundation.The results show that the horizontal displacement of the bridge pile is much larger than the vertical displacement.The horizontal displacement of the cement pile is smaller than that of the cement mixing pile.The displacements of two typical sections are both less than 5 mm requirements.