The work aims to explore the design method of second-hand clothing trading platform based on persuasive design theory and lead users to conduct sustainable consumption behavior. Quantitative and qualitative research methods such as questionnaires and interviews were used to gain insight into user behavior, the inductive method was used to cluster the original demands of users, then a user experience map was drawn to extract the experience problems existing in the process of second-hand clothing trading. Under the theoretical guidance of Fogg Behavior Model, the design opportunities were found and the corresponding design strategies were obtained from the perspectives of motivation, ability and trigger factors, as the guidelines to create a second-hand clothing trading platform. Persuasive design was taken as the starting point to change user behavior and attitude and the design of the second-hand clothing trading platform was completed to improve the user experience and promote the development of sustainable consumption. According to the FBM, analysis is carried out from the perspective of behavior to propose the design strategies such as increasing the attractiveness of the platform, reducing users' cognitive load, and enhancing users' targeted feedback, so as to provide new ideas for improving the user experience of the second-hand clothing trading platform, and finally enable users to develop sustainable consumption habits.