Abstract:Strategic emerging industries are based on major technological breakthroughs and major development needs, which play a leading role in the overall and long-term development of the economy and society. At present, Liaoning is in the middle and late stage of industrial development, and actively developing strategic emerging industries is an important way to promote the optimization and upgrading of the industrial structure of Liaoning province and to cope with the increase of the current economic downward pressure. Based on the data of 17 sample enterprises in the strategic emerging industries of Liaoning Province in 2012-2016 years, this paper uses data envelopment analysis (DEA) to measure the input-output efficiency of strategic emerging industrial enterprises in Liaoning. The empirical results show that only a few of the sample enterprises have achieved the best input-output efficiency. Most of the enterprises still have the inefficiency of scale efficiency or pure technical efficiency, or the two cases are ineffective at the same time. Finally, the corresponding improvement mechanism is put forward for Liaoning's strategic emerging industries.