Yantenglianghuai(Yanzhou,Tengzhou,south Huai and north Huai 4 cities),who mainly developed energy industry,is one of the 19 important comprehensive developmental areas in China.Coal mining and land cave in made it a weak ecological system with more exploitation and less terrilorial management.After investigation,the coal mining cave in land in this area as was classified into 5 types:cave in dry land,cave in swamp land,seasonal water heaped up lave in land,shallow water and deep water heaped up land,...