Geothermal　resources　management　systems　and　geological　material　visualization　applications　often　need　user-steered　interactive　displays　of　a　geological　body　representing　the　underlying　sparse　borehole　data.　This　paper　presents　an　approach　for　characterization　of　3D　shape　and　relationships　of　groundwater　units　by　using　data　obtained　from　the　borehole.　At　the　same　time,　we　realize　interactive　visualization.　There　are　four　Groundwater　units　in　research　area:　impermeable　stratum,　which　is　made　of　the　Quarternary　sand　clay;　water-bearing　stratum,　which　is　made　of　Quarternary　silt　sands,　gravel　and　sandstone　geothermal　rock　groups;　water-bearing　stratum,　which　is　made　of　rock　with　crack　configuration　geothermal　rock　groups;　impermeable,　which　is　made　of　rock.　The　methodology　encompasses　the　following　main　steps:　the　borehole　data　are　linearly　interpolated　on　geological　characteristics,　divided　the　entire　set　of　2D　sections　into　subsets　of　＇similar＇　2D　sections;　To　generate　2D　sections　using　the　elements　of　each　subset　using　the　triangulation　(Delaunay)　and　Kriging　arithmetic;　To　divide　the　entire　set　of　border　points　that　belong　to　a　sub-set　of　similar　2D　sections　into　classes　of　＇corresponding＇　border　points;　build　3D　grid　data.　3D　objection　is　visualized　employing　Direct　Volume　Rendering　(DVR),　which　includes　ray-casting　and　z-buffer　algorithm.　Visualization　is　realized　in　programmable　data　analysis　and　visualization　environment　IDL.　With　this　approach　Fuzhou　geothermal　field　three-dimension　visualization　system　was　developed　successfully.　It　is　able　to　realize　three-dimensional　interactive　incision,　analysis　and　query.　©　2005　IEEE.