AbstractDue to the development of the traffic network, more and more excavations of foundation pits nearby highway are brought through. It is a very important question that how to control the influence of the excavation to highway bridge foundation. A practical engineering was studied here. In order to better reflect the influence of foundation pit excavation to bridge pile foundation, 3d numerical analysis method considering the interaction of pit, soil and pile was used. The mechanical behavior in the whole process of the construction of foundation pit was analyzed. The feasibility of the construction method and corresponding supporting measures was discussed. The effect of grouting reinforcement was also discussed. By the results, retaining piles have shield effect on the stress of bridge piles and using grouting reinforcement can greatly reduce the deformation of surrounding soil.