The rapid development of digital technology and the Internet has also created favorable conditions for the rise of second-hand trading platforms. The popularity of the Internet has made it easier for people to find and trade unused items. In contrast, the popularity of smartphones and apps has further promoted the convenience of second-hand transactions. Idle Fish is a subsidiary of Alibaba and provides a second-hand goods trading platform and community. This article analyzes Idle Fish’s operational strategy, including cooperation with Taobao and Alibaba, multi-functional services, platform page design and intelligent operations. A SWOT analysis was conducted on the platform’s strengths, opportunities, weaknesses, and threats. Finally, development strategies are proposed, including strengthening transaction security, improving community operation quality, encouraging celebrity and influencer participation, improving service quality, optimizing mobile application experience, collecting and analyzing user data, exploring partnerships, and maintaining quality control processes. Through these strategies, Idle Fish can fully realize its potential in the second-hand e-commerce market and meet evolving consumer needs such as sustainability, affordability and unique shopping experiences.