As a design strategy with great sustainable potential, product-service systems are widely used to discuss issues related
to sustainable developpment. However, systems that are not properly designed will generate further serious irreversible
consequences on the environment. It is therefore necessary to accurately assess and analyze the environmental
impact of product-service system solutions. This paper expands the method of environmental life cycle analysis from
the analysis of products to the analysis and evaluation of product-service systems, discusses life cycle differences between
product-service systems and traditional product models, and demonstrates the application of life cycle analysis
methods to systems. The process unit establishment method was applied in sustainable design curriculum, in which
a sustainable takeaway lunch service system solution that was proposed in the course was tested. The process unit
was described to provide a theoretical basis and support for future in-depth measurement and analysis.

Authors: Nan Xia