In order to study the geotechnical risk assessment and management technology in pile foundation engineering,the study conducts the fault tree analysis(FTA),clarifies the logical relationship between different fault factors,and calculates the occurrence probability of specific fault events with fault logic diagram.The study discusses the application of technology to control risks with specific cases,and points out the complexity of the geological conditions of the project area and its impact on the stability and safety of the building.The results show that fault tree analysis can effectively help people identify and manage the key risk factors affecting project safety,and it has important theoretical and practical application value for guiding practical engineering projects.Analysis and management of geotechnical risks in pile foundation engineering can identify and prevent potential risks in advance,effectively ensure the smooth progress of engineering projects and long-term stability of structures.