Abstract: CiLin mountain coal mine in the process of production, due to pioneering reasons, mining the lower coal seam No.15 coal seam, led to the upper layer movement, deformation, may affect the upper not mined No.9 coal seam and the influence of roof, CiLin mountain coal mine for analyzing the feasibility of CiLin mountain coal mine with No.9 coal seam for engineering background, using UDEC numerical test system, establish a numerical calculation model of coal mining, dynamic simulation analysis of coal seam face through the push empty area, into the empty area, in the empty area and empty area five stages.The analysis shows that when the coal seam working face is not in and out of the empty area, the working face is basically free from the No.15 coal seam mining; when entering the empty area, the stress increases, causing damage to the top floor, the supporting measures should be strengthened; when the working face is in the empty area, slight step subsidence. The analysis shows that No.9 coal seam can be mined and has industrial practice. Through the monitoring and analysis of the ore pressure data during the normal mining of coal seam, it is shown that the surrounding rock pressure meets the normal production needs of the mine.