Abstract: In order to establish excavation 3D model simpler, more quickly, more efficient, more accurately, more directly and to realize 3D displaying of the design results, a 3D excavation software for parametric modeling and dynamic displaying is developed. The functions, architecture, key technology, difficulties, countermeasures and realization process of this software are introduced. Meanwhile, application of the software to the excavation of CCTV verifies the feasibility and practicality. The results show that this study has important theoretical significance and application value.