本报告的主要内容包括钢铁流程能效的定义，以首钢京唐公司的数据作为评估依据，划分钢铁流程能效评估的边界和范围。并阐述了钢铁流程能效的计算方法，以及能源投入、损失的取值原则，解析了京唐2015年数据和能效的特征，能效指标综合衡量了企业的能源整体利用水平，为企业提高能效提供了指引方向。最后，比较分析了能源效率与传统能耗评价指标体系的特点。

This report mainly introduces the definition of energy efficiency in steel process with the evaluation basis of the data from Shougang Jingtang company, divides the boundary and scope of energy efficiency assessment of steel process. The calculation method of energy efficiency of iron and steel process is described along with value principle of energy input and loss, the analysis about characteristics of data and energy efficiency is given with the situation of Jingtang in 2015, energy efficiency indicators comprehensively measure the overall energy utilization level of enterprises and provide guidance for enterprises to improve energy efficiency. Finally, the characteristics of energy efficiency an traditional energy consumption evaluation index are compared and analyzed.