Top-coal caving method with horizontal sectional light-support in steep and close seams

Said invention relates to underground coal mining method, especially the horizontal sectional light support roof caving coal mining in very steep close range coal bed, which contains combined unitization laneway of cross range coal bed, digging slice drift according to horizontal slice roof caving height, digging return airway, digging air way, digging coal sliding conduit, man pass conduit and communicating slice drift, track stone door and return air stone door. The coal getting process contains forepoling, top coal drilling, charging, moving foot end, moving hydraulic support, blasting and top coal caving.