Abstract: According to 3201 lower working face WF₆₂ fault geological and hydrogeological conditions of Jining Liangbaosi Coal Mine, based on the numerical simulation software FLAC^3D, we carried out fluid-structure coupling numerical simulation for working face floor mining-induced damage, to further explore influence law of working face advancing direction on floor mining damage when the lower plate coal is mined after mining upper plate coal first. The results show that the vertical stress concentration near fault zone rock mass is more obvious when the working face advancing is against the fault tendency, mining of coal floor has larger influence on destructive of plastic zone, and the floor damage depth is 5 m bigger than that working face advancing along the fault tendency. For safety mining, mining the lower plate coal after mining the first plate coal, advancing the working face should be along the fault tendency.