Sustainability and digitalization have become the main direction of transformation of enterprises. Building a digital twin platform network can provide enterprises with a comprehensive view of products, manufacture, supply chain, customer experience, and profitability, which is conducive to the construction of a sustainable business model. The purpose of this paper is to study how enterprises use digital twin platform networks to generate economic, social and environmental benefits in various dimensions and their coupling relationships. Based on the literature review, this paper constructs a five-dimensional framework of a sustainable business model, and analyses the coupling relationship between dimensions. Using Haier as a way to verify the five-dimensional framework, it explores the dynamic mechanism of the Haier digital twin platform network, constructs an integrated framework based on coupling perspective and compares it with other two home appliance enterprises. The study shows that, through the digital twin platform network, enterprises can remove the disadvantage of focusing on a single product life cycle, and form a comprehensive network, so as to promote overall sustainable upgrades. This paper draws generic strategies and digital transformation suggestions for enterprises to innovate the sustainable business model. The conclusion enriches the research on sustainable business models both theoretically and practically and provides a feasible reference for the transformation of enterprises in digital economy environment.

The present study on product service system (PSS) paid little attention to strategic lifecycle perspective, herein lost strategic sustainable for PSS, firms and service supply chains (SSC). To improve it, this paper critically reviewed the study on PSS, firm, and SSC etc. with strategic and tactical lifecycle perspective. Based on this review, it redefined PSS and put forward an evolution framework of PSS for firms across SSC with integrated lifecycle perspective. This framework might give a new approach on the evolution mechanism of PSS for firms across SSC.