Abstract: Life cycle cost analysis (LCCA)，according to life cycle thinking，is a systematic methodology，which assesses the environmental and economic performance of products through estimating the monetary value of environmental impact in their whole life cycle and checking their internal cost. Base on the model of life cycle cost，two indices of product greenness factor and greenness ratio were presented，which provided measurable indices for selecting alternatives or comparing the performance of different products. In this paper，LCCA was used to systematically analyze the economic and environmental performance of acetylene produced from natural gas. The results showed that LCCA could identify the main elements which affected the holistic performance of the process，and select the best process from alternatives.

摘要： 采用生命周期思想，通过对产品生命周期内的环境影响货币化和产品生产过程中内部成本的核算，建立综合考虑环境性能和经济性能的产品生命周期成本模型。在成本模型分析的基础上，提出产品绿色因子和绿色比值两个指标，为不同工艺或产品的性能比较提供量化依据。以天然气生产乙炔为案例分析对象，结果表明成本模型能够有效地识别影响产品综合性能的关键因素和最优的产品工艺方案的选择。