Abstract: In order to accurately predict and analyze the impact of mining on the bridge building, taking the working face in Sandaogou Coal Mine as the experimental platform, FLAC^3D is used to predict and analyze mining subsidence of bridge building under the condition of large mining height and shallow overburden, and the influence scope is determined. The results show that the inclination of surface is one of the main factors resulting in bridge building damage; bridge building damage showed the tend of damage accumulation - completely destroyed - failure to be stable; through the selection of boundary conditions and the appropriate geotechnical parameters, the basic law of the bridge subsidence damage can be more accurately simulated.