Abstract: Abstract:Is long mining pits for a long time under the influence of the thick sandstone roof aquifer, water fractured zone height is mine safety mining under water body is an important parameter, for his long mine sublevel caving mining under thick sandstone aquifer water flowing fractured zone height, this paper collected the mining area 17 groups of working face water fractured zone height measurement data for analysis.The results showed that;Lead water fracture zones empirical formula calculation results in his long mining area distortion problems, is not as his long mining area calculation formula for reference of the fissure zone, based on the use of the collected 17 groups of working face water fractured zone height measured data using multiple regression analysis it is concluded that the long Yu Bin mining area calculation new formula of the fractured zone height,Based on the background of ZF1403 working face in Yadian Mine, the height of water-conducting fracture zone was studied by means of regression formula, numerical simulation and field measurement. The results of the three research methods are basically consistent, and the application effect of regression formula is good.