Low recovery rate of top coal, coal wall rib spalling, serious roof caving, instability of support and equipment in specially thick coal seam inclined fully mechanized working face confines the safe and efficient mining in working face. 8101 large inclined and fluctuated thick coal seam fully mechanized working face of Ruilong Mine was taken as example, rebound apparatus test was conducted in main mining coal seam, 3d top coal release simulation experiment platform was studied, the practice showed that recovery rate achieved by 85%, realized the safe and efficient mining of working face.