Abstract:The structural characteristic of rock mass plays an important role in rock mass engineering construction,so correct evaluation of rock mass quality is of great engineering significance. Based on the collection and analysis of massive data,taking advantage of 3D visualization engineering software,3D engineering rock mass and block models are reconstructed by means of a new data structure and method. Then,effective estimation of 3D geological block models is made by geological statistics. Finally,block models with different indexes are combined using set operation algorithms of space pattern so as to analyze and evaluate rock mass quality. The theory is applied to rock mass quality evaluation in the third mining zone of Jinchuan mine with satisfying application efforts.