With the rapid development of domestic super high-rise buildings in China, both the scale and depth of deep foundation pit projects keep expanding, and more deep foundation pits appear in the areas with dense buildings and population, which puts forward higher requirements for the design and construction of foundation pit projects. However, the present 2D survey data are incomplete and inaccurate, which restricts the effective application of geotechnical survey data by all parties involved in the project. The BIM technology, with its own characteristics of 3D visualization and parameterization, is able to apply the information of abstract and complex survey data to construct a digital 3D model with given geological information data. Then, communication and decision-making according to the digital 3D geological BIM model will improve the scientificity of engineering design scheme and construction scheme. This paper takes the BIM application in the foundation pit and basement engineering of the Qianhai Trading Plaza Project an example, to elaborate the application process of BIM technology in complex geology and pile foundation engineering. The feasibility of BIM application is demonstrated by comparing and analyzing the real data of the project. The study is able to provide reference for the construction of similar complex geological foundation pit.