The coordination of energy security and efficient development and ecological environment protection in large open-pit coal mine area is not only the basis of regional economic, environmental development and energy security, but also the key to the sustainable development of mining area. Aiming at the problems of energy development and environmental protection of large open-pit coal mines in the cold grassland area of eastern Inner Mongolia, the effects of open-pit coal mining on water, soil, vegetation, landscape and ecological stability were systematically studied; The concept of "source reduction and system restoration" is put forward. Taking systematic ecological reduction as the main line, technologies such as source reduction of mining technology, loss control during stratum reconstruction, quality and capacity improvement of topsoil, plant microbial drought resistance and growth promotion, landscape reconstruction imitating natural landform, water resource utilization guarantee of ecological restoration in mining area are developed, The ecosystem loss reduction and collaborative restoration technology system and application mode of large open-pit mining drainage recovery integration and multi factor coordination have been established, and good application demonstration has been carried out in Baorixile open-pit Coal Mine and Shengli energy open-pit Coal Mine in typical cold grassland mining areas, which provides a systematic solution to the ecological problems caused by open-pit mining in ecologically fragile areas in China.
 

Cold steppe area,systemic ecological impairment,source impairment of mining technology,process loss control,multi-element system restoration,integrated demonstration