Abstract: To address the limitations of coal mine gangue on the green development of mines,Changcun Coal Mine is taken as the research object.Combined with the specific conditions of the mine,the existing well roadway surface engineering and facilities and equipment above and below the well are fully utilized.A suitable downhole filling area is selected in the mine,when laying out the main roadway in the mining area,a tape transportation roadway is set up along the edge of this section,forming a complete transportation and auxiliary transportation system;Connect with the existing main roadway of the mining area to form a complete downhole filling and transportation system;Use a fully mechanized roadheader to select a strip area with appropriate length and width for stoping,block both ends of the strip,and fill the strip with slurry to carry out complete downhole filling mining.The surface subsidence observation results of filling mining indicate that this technology has low compression rate of filling bodies,low cost of filling materials,and simple and easy operation process.