Abstract: In order to study influence laws of upper and lower panel mining sequence on floor failure characteristics, taking the conditions of Heze Longgu Coal Mine 1302 working face as engineering background, the fluid-solid coupling numerical simulation of working face floor mining-induced damage is carried out. Research shows that when lower panel is mined, the pore water pressure of fault fracture zone is more concentrated, mining stress has larger destructive on floor plastic area, failure depth is deeper 5 m than the first mined hanging wall. For safety mining, taking the mining method of "first mining upper panel, then mining lower panel" can provide a theoretical basis for normal mining of working face.