Abstract：Aiming at the difficulties of geological modelling and space unit division in pre-processing of numerical simulation analysis for engineering rock-mass structures，the coupling pattern and method of 3D geological model with numerical simulation are put forward to simplify the pre-processing. The refined 3D engineering geological integrated model was built by the 3D geological modelling system in the research area. Then，the element mesh model could be generated automatically. Subsequently，the model data were converted and imported to numerical simulation programs；and it offered different kinds of 3D mesh division models with abundant information. It can not only simplify the pre-processing of numerical computation and analysis，but also is abounding with the attributive information of 3D geological models. And it will offer a visual and convenient information platform for engineering design and optimization.
