Based on the concept and theory of geologic body geometric modeling, the essential ways and techniques for building computer system of geometric modeling of geologic bodies were presented. The data structures of geologic body geometric modeling, construction of geologic bodies models, geometric operation and entirety properties analyses of geologic bodies were discussed. In addition, the concrete process for auto- mated ore-delineation and automated generation and plotting of exploration profile maps by using these theories and methods were put forward, and some actual application examples were also given.