Abstract: In this paper, to evaluate the cavability of ore rock comprehensively for guiding the block caving design, according to geological conditions exposed by engineering geological survey, the factors influencing the cavability of ore rock are studied by using multifactor comprehensive evaluation method．The results show that the comprehensive consideration on distribution law of the rock mass structure characteristics indexes can reflect the cavability of ore rock better．Finally, we classify the ore body cavability of one mining area in this paper, and find that the cavability of this mining area is between the levels of middle to better, which can provide an important guidance for the future work in mine.

Key words: rock mass structure, cavability, rock mass quality classification, MRMR method