Abstract: Under the background of China’s coal-based clean energy strategy, the environmental impact post-assessment system promotion of coal mining is imminent with the rapid development of the national environmental protection system reform. In this paper,the key contents of environmental impact post-assessment for coal mining were analysied systematically, the opportune?moment to assess environmental impact and service cycle were discussed.The paper will provide technical support for formulating Technical Guide named Environmental Impact Post-assessment of Coal Mining and promote the environmental impact post-assessment system.