There is a subsided area covering 4 700～5 300 ha sunk as perennial or seasonal pond-ings in Xuzhou mining area.The average depth of water in these pondings is about 3～3.5m and the deepest ponding is about 7m.It is impossible to recultivate this kind of subsided area.For making use of the deeply subsided area,several types of constructed wetlands are proposed to build.On the basis of the characteristics of natural environment,hydrology,river system,sunk degree of the subsided area,three types of constructed wetlands including decontaminated constructed wetland,fishery constructed wetland and landscape constructed wetland can be built.The decontaminated constructed wetland should be built in shallow pondings,especially in some seasonal pondings or perennial poundings with a water depth no more than 0.5m.The aquatic and wetland plants,such as reed and cattail,can be introduced to the decontaminated constructed wetlands.The principles of choosing wetland plants are that these plants should be native with strong purification capacity and economic efficiency.The reed wetland has both economic efficiency and strong purification capacity,hence the subsided area can be improved by creating constructed wetlands.Such a measure adopted should also be suitable to local conditions,especially for Xuzhou,as water is shoutage in the city.The remediation of constructed wetland can not only withhold precipitation resource but also reuse tail water of wastewater so as to mitigate the contradition of water shortage issue.