There are many factors influencing the height of caving zone, regulation of mining under bridge, village and water body only takes the influence of mining thickness into account, with limitations and inaccurate problems. Based on great number of measured data, height of caving zone , the mining thickness, hard rock lithology ratio coefficient and mining depth were got by multivariate statistics analysis method. The sensitivity of the influenced factors can be concluded according to the sensitivity evaluation model and its test model. Finally, the DM-M prediction model was established, and the practice showed that the model improved the prediction accuracy of the height of caving zone.
