Abstract: Huainan energy-based city have simultaneously been conducting since 2003 the program of Three Industrial Bases'(referring to coal-mining coal power plants coal chemical industries) and Eco-city Huainan'.Regarded as a typical example of huge-scale ecological engineering in coal-mine area under above construction background in east China,the strategic idea and the rounded framework on eco-environment restoration of coal-mining subsidence land are put forward scientifically with the concept of sustainable development in this paper.The framework in detail concerns these aspects as following: focusing on one objective,conducting two core issues;conceiving the restoration mapping of three divisional sites in whole coal-mining area;acting up to four main principles;exploring and practicing the innovating engineering implementation concentrated upon five kinds of keystone eco-restoration techniques with the life-cycle concept of coal exploitation and utilization.