Abstract: In the technology of three-dimensional geological body, texture mapping has always been one of the parts ignored in the process of texture mapping.Although three-dimensional geological body texture mapping could be primarily realized, there still exists problems such as distortion and boundary gap.To improve the effect of texture mapping this study takes a coal mine strata model as the research object based on computer vision by building and completing the sample database of texture mapping, and by using Delaunay triangulation to improve the quality of grid model for three-dimensional reconstruction, and by choosing normal mapping and seamless border processing technology to conduct three-dimensional geological body texture mapping.The results show that the three-dimensional geological bodies by using DT and normal mapping technology are finer and prettier than the present ones.Thus, the sense of reality of three-dimensional geological body models have been greatly increased and the problem of discontinuous boundary has been solved.