Based on large amount of left coal resource in Ruifeng Mining Industry of Jingxing Group, according to sufficient research, super high water material filling technology was adopted to recycle the left coal resource, combined with mine second-mining physical property and economic ability, an appropriate new overall top beam suspended support was studied, the support structure was simple, with easy operation, could support breaking roof in second-mining area, maintain filling space, cooperate with the pack filling and complete the filling second-mining.