Abstract: Based on the reliability evaluating indicators of functional reliability and capability utilization,in combination with studies on the energy consumption states of steel manufacturing process systems,a new assessment system of energy reliability,process energy efficiency ratio and similar degree was established to describe the level of energy consumption reliability.The concept of contribution index was used to quantitatively analyze the influence of the two latter indicators on the energy reliability.Finally,the new assessment index was also applied to evaluating the energy consumption reliability of an EAF special steel plant.The evaluating result shows that the energy consumption reliability increases from 0.64 in the year 2008 to 0.72 in the year 2009;meanwhile,main reasons for the change of energy consumption reliability in the period of 2006 to 2009 were also discussed.