Abstract: In order to study the height of water flowing fractured zone of Jurassic coal mining, firstly, based on the measured data of height of water flowing fractured zone under regional Jurassic coal seam mining, we found that there were greater differences with the calculation of the empirical formula in current specification. A non-linear formula which can be apply to predict the height of water flowing fractured zone in the study area was established by multifactorial regression analysis. Then, taking Jinjitan Coal Mine as the study area, the fissure developing height and dynamic process of roof deformation and destruction of fully mechanized caving mining in Jurassic coal seam was simulated and analyzed using RFPA software, which took engineering geological parameters dynamic variation of coal seam roof under the large-scale mining into consideration. Research shows that the prediction error of multivariate nonlinear formulas is smaller than that of other formulas; using multivariate nonlinear formulas and numerical simulation, the predicted height of water flowing fractured zone of the full-mechanized top-coal caving mining face in Jinjitan Coal Mine is 176.68 m and 174.80 m respectively, they are basically consistent.