In the rapid development of the global digital economy

cross-border e-commerce has become an important part of international trade. The traditional cross-border e-commerce model often exists slow response speed

high inventory costs

low matching degree of user demand and other pain points. However

the company represented by SHEIN has achieved an average annual compound growth rate of over 100% with the help of digital supply chain. This paper analyzes SHEIN's closed-loop growth flywheel model centered on "user recruitment - data decision-making - supply chain response - experience optimization" through case studies. It also looks into the future and explores what the industry can learn from each other.