Abstract: In order to solve the problem of surface subsidence and water resources destruction can be easily caused by conventional mining because of complex geological conditions,dense surface buildings and underground pipelines in Jinggong No.1 Mine of China Coal Pingshuo Group Co.,Ltd.,through analyzing the stratigraphic characteristics and hydrogeological conditions of the mining area,the filling mining technology based on aeolian sand and high water expansion materials is proposed,and the FLAC^3D numerical simulation method is adopted to optimize and design different mining heights,filling materials and process parameters,and determine the filling strategies suitable for continuous mining and fully mechanized mining faces,including material ratio,filling step distance and process flow.When the equivalent mining height of filling mining is 0.35 m,numerical simulation shows that the surface subsidence coefficient is 0.27,effectively controlling surface subsidence and protecting surface buildings,groundwater,and pipeline facilities.The research shows that the aeolian sand high water expansion material filling technology has significant advantages in terms of economy and environmental protection,providing effective technical support for green mining in coal mines under similar complex geological conditions.