China's second-hand economy grew rapidly in 2024, with transaction volume reaching about 1.69 trillion yuan, a 28% year-on-year increase. This shift reflects a new consumer model integrating sustainability and individuality. While pilot programs aim to diversify trading channels and regulate the market, challenges remain in standardizing recycling channels and appraisal processes. The application of AI and big data is seen as key to overcoming trust and efficiency barriers.