Abstract: The surface of the mining area of Wulan Mine is a fragile grassland environment. The mining area requires strict environmental protection conditions. During the mining process, it is necessary to ensure that the surface does not have large displacement. Based on MIDAS/GTS and FLAC3D, this paper conducts numerical simulation of the collapse pit of Wulan Mine, and analyzes the microseismic and stress data in combination with the data obtained from the ground pressure monitoring system, so as to provide data support for the goaf management of Wulan Mine and provide reference for similar mines.