Abstract: Lanxing Coal Mine 2201 working face is designed to recover coal pillar which is left during the process of the old mining, so the condition of it is very complicated. In order to mining this working face safely and efficiently, the study set up old mining area occurrence conditions model through theory analysis and site observation, FLAC^3D software is used to simulate old mining area secondary mining and analyze the wall rock stress distribution in the process of mining. It was concluded that stress transferred to the front coal pillar following the advance of working face, and the scope of mining was 30 to 36 m, and abutment pressure of excavating pillar showed higher-lower-higher tendency, and it's easy to appear stress concentration when coal pillar was mined or the roadway is crossed, and ground pressure was strong, so it should take measures for support and management in advance.