Abstract: In order to establish three-dimensional geological model of ore deposit，techniques for modeling and visualizing of borehole data are proposed.Platform independent SQLite embedded database is utilized and data structures of collar table，sample table，survey table and lithology table are designed to organize and manage the borehole data.Two kinds of errors existed in borehole data are analyzed before creating the three-dimensional borehole model.The curve of borehole trace is simplified as polygonal line，then formulas for calculating borehole trace of two mathematical models are put forward，including average angles with total length and total angle with half length.Borehole data structure of graph associating attributes table is proposed to store three-dimensional borehole model.Points and line segments are used to store the spatial location of borehole openings and samples，and the data table is used to store the attributes of drilling number，element grade and weight of samples.Borehole trace is displayed by polyline and attributes are visualized by the forms of texts，colors，figures in three-dimensional space.The above algorithms are implemented on Hoops 3D platform and the three-dimensional borehole model of a copper mine between 32# and 56# exploration line is built.The copper orebody boundary is delineated through the borehole trace and visualization of copper grade.The results show that the techniques proposed in this paper for creating three-dimensional borehole model is accurate and reliable，and it is helpful for enhancing the efficiency of geological analysis and deposit modeling.

Key words: Geological modeling, Data visualization, SQLite embedded database, Three-dimensional borehole model, Borehole trace curve, Hoops 3D platform