Abstract: Taking Qinglong Mine as the experimental object, combining with the field actual measurement of development height of water flowing fractured zone, two methods including the similar material simulation and numerical simulation are used. The research results show that the developing height of water flowing fractured zone of the overburden rock in Qinglong Coal Mine is from 42 m to 46 m; along with the advance of the working surface, the development height of the water flowing fractured zone gradually increased, and finally reached the stability; during the mining process, the wall of coal on the front and behind of working face appeared the phenomenon of stress concentration; the final failure shape of the overlying strata is the "saddle" at the end of the working face.