Abstract: With the continuous mining of the mine, the stope conditions become increasingly complex, which brings a lot of problems such as stress concentration, the deformation of surrounding rock, and seriously restricts the high yield and high efficiency of mine. For the geological conditions of fully mechanized caving face surrounding rock in Dongtan Coal Mine thick coal seam with gangue, we analyze the weakness of original section and support scheme, and propose a new inverted-trapezoid large section support scheme, design corresponding supporting parameters. The field practice and in-situ monitoring results show that the determined roadway shape and support parameters can meet the needs of the safety production.