Abstract: In order to promote gypsum mine safety production management, and improve the recovery rate of room and pillar mining resources,reasonably determine the mining and remaining ratio of room and pillar in the process of mining,stope mine pressure laws under different mining and remaining ratio conditions are simulated and analyzed by UDEC,the results show that the influence degree of mining width on stability of working face is far greater than the pillar width on working face.In addition,through the analysis of the plastic zone chart of numerical calculation,vertical displacement, vertical stress and principal stress chart, the paper ultimately determines that the reasonable ratio of mining and remaining in depth is 128~351 m,dip angle is 6°~10°，ore-bearing layer is 4 m×4 m.