Maimai Second-hand Trading Platform is a second-hand trading platform driven by innovative technology. It is headquartered in the UK and serves users from diverse cultural backgrounds. We aim to provide users with an efficient, transparent and sustainable second-hand trading ecosystem through an intelligent trading system and strict security mechanisms. The platform supports multi-category transactions, from electronic products, household items to clothing accessories, to meet the diverse needs of users. We not only focus on user experience, but also on the concept of sustainable development. By encouraging the reuse of items, we contribute to the sustainable development of the earth.