单位生产总值钢产量指标对于调控钢产量，开展钢铁行业的节能、降耗和减排工作具有重要意义。首先给出了单位生产总值钢产量定义式，引入了“在役钢量”概念及其计算式；然后对单位GDP钢产量的定义式进行了两次变换，导出具有分析功能的新定义式；并以新定义式和钢产量计算式、钢铁行业能耗、物耗和排放计算式为依据，对钢产量及钢铁行业的能耗、物耗和排放进行了分析；最后，进行了与钢铁行业相关各参数的分类，并提出全面推进钢铁行业节能、降耗、减排工作的总体看法。

Steel output per unit GDP is an important index for controlling steel output,  for energy-saving, materials-decreasing and wastes-reducing of steel industry. This paper first gave the definition of steel output per unit GDP, introduced the concept and calculating formula of "in-use steel", Then two times of transformation for the definition formula of steel output per unit GDP were undertaken to obtain the new definition formulas with analytic function. Steel output and energy consumption,  materials consumption & wastes emission of steel industry were analyzed by using the new definition formulas of steel output per unit GDP, calculating formulas of steel output,  energy consumption,  materials consumption & wastes emission. Finally parameters related to steel industry were categorized and overall view for comprehensive promoting energy-saving, materials-decreasing and wastes-reducing of steel industry were put forward.