With the popularization of Internet technology and the rapid develapnent of mobile peayment, peaple’s living standards are c inproving. The purchasing power of college students is also increasing day by day. The desire for consumption is exuberant. The reason for shopping is more the pursue of the trend and beauty. In this context, many college students are blindly impulsive, resulting in a large number of items being idle. These goods have valuein use, but they are no longer used because the buyer loses freshness, this is a comon phcnomenon in college life. So we build the second-hand trading platform. On the one hand, the establishment of campus second-hand trading platform can help college students to solve idle items and free up living space on the other hand, it can also improve the utilization of resources and respond to the call of national green environmental protection and resource conservation.