Abstract: The quality of rock mass is a prerequisite for determining the cavability of block caving methods, and the study of rock mass cavability is a relatively complex systematic process. In response to the limitations of traditional methods for assessing rock cavability such as RMR14 and RQD, an improved RMR14 assessment method is proposed based on JM Mine as the research object by modifying the evaluation indicators of the RMR14 method and using continuous function values. Then, the improved RMR14 method and RQD assessment method are comprehensively adopted, based on the Fuzzy Analytic Hierarchy Process theory, the improved RMR14 value and RQD value are selected as assessment factors for the dual F-AHP method, the normalization and quantification are carried out respectively, and then the weights are determined, so as to construct the assessment system of rock cavability. Based on this, a three-dimensional assessment model of the mining area is obtained through spatial interpolation using geostatistical methods for cavability analysis. The study results show that the cavability within the evaluation area of the JM Mine can be divided into three levels, namely level I, level II, and level III. The collection volume of level II cavability units accounts for 88.9% of the total volume of the evaluation area. The average N_Fi of the comprehensive assessment index for the overall cavability of the mining area is 0.239, and the assessment index N_Fi value of rock cavability based on the exploration lines, which varies between 0.216 and 0.250, the cavability is classified as level Ⅱ and also belongs to the difficult to cavability level. The results provide a reference basis for the subsequent design of the mine. At the same time, the assessment system also provides a certain reference for assessing the cavability of other block caving mines.