Abstract: Construction of pumped storage power stations is characterized by complicated topography, narrow construction space, difficult road layout, and mutual restriction between excavation and dam filling. To consider these characteristics, an auxiliary 3D modeling method for excavation is developed through AutoCAD secondary development to obtain the relevant position, shape and blasting parameters of a 3D solid model. And a simulation model for describing the procedure and characteristics of excavating construction of a general pumped storage power station, particularly the relationship of excavation and filling and the influence of topography and slag road, is also presented in this paper. This model is solved and implemented on the Visual Studio C#.Net platform and validated through application to an engineering example, demonstrating its effectiveness and feasibility of excavation simulation.