Abstract: According to the fact that the empirical equation is not suitable for depth of destroyed floor in Hancheng mine area, in order to determine the depth of destroyed floor, for water control measures, the law of depth of destroyed floor must been knew. Taking coal mining face No.3105 of Sangshuping mine as research object, based on the measured value of depth of destroyed floor, main factors of effecting was been determined. Then use the FLAC3D to build a numerical model, combine with linear regression to build a regression model which considering multi-factors. Through compare the measured value of depth of destroyed floor and empirical equation show that the regression model is accurate. It can prediction depth of destroyed floor in Hancheng mine area, Of great significance to coal mining in Weibei coalfield.