Abstract: Three-dimensional stratum modeling and visualization are the important application of three-dimensional geological information system (GIS) in geosciences，and it can completely and unambiguously define the various geologic structures information，which is very helpful for actual geological analysis.On the basis of this，the three-dimensional strata model establishing method is proposed，which is based on tetrahedral network(TEN)，generalized tri-prism(GTP) and visualization toolkit(VTK).The borehole data is used to establish the three-dimensional strata model by the method.Firstly，the triangle irregular network (TIN) is generated by the borehole collar data；then，according to the spatial sequence of strata，each triangle of TIN is expanded downward to obtain GTP voxel model along the borehole，and the GTP voxel model is tetrahedron subdivided by building the three-dimensional strata model；finally，three-dimensional display and spatial analysis functions such as property inquiry，distance and angle measurement and cut are realized by the three-dimensional strata visualization system developed by visualization toolkit(VTK).The experiments are conducted based on the borehole data of a mine，the results show that the GTP model based on TEN contributes to solve the problem of space entity subdivision and cutting，the application of VTK in three-dimensional stratum visualization is feasible，and the performance of VTK in visualization function and spatial analysis is perfect.Therefore，it has some reference for enhancing the efficiency of mine geological analysis and mine geological modeling and visualization.

Key words: Three-dimensional strata modeling, Visualization, Borehole data, Tetrahedral Network, Generalized tri-prism, Triangulated irregular network, Visualization toolkit