5 the method of bottleneck diagnosis about energy systems has been proposed 6 the universal simulation method based on elimination of residual on nodes has been applied successfully in the analysis of flow network in energy system 提出了能量系统的瓶颈辩识方法。本方法以火用损失系数为变量,引入高效能可代换元件的概念来体现工程实在节能潜力,实现了对系统能耗关键元件的诊断。