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Because of the advantage of geographical location between China and Mongolia, and the advantage of industrial structure and exchange space, China and Mongolia's trade development prospects are wide. Therefore, this paper chooses the data of China's 15 major coal listed companies from 2009 to 2014 to study, in order to enhance the efficiency of Mongolian enterprises and to promote the Sino Mongolian cooperation and exchange. The main work of this paper is to introduce the background and significance of the topic, to analysis the energy efficiency in the DEA, to establish the evaluation index system and analysis of the efficiency of China's coal enterprises.

An Analysis of the Production Efficiency of Large Coal Enterprises in China and its Enlightenment to the Enterprises in Mongolia