With WeChat applet as the carrier, the construction of the search platform can avoid the problem of lost items as much as possible. Therefore, we analyzed nearly 1,000 pieces of data released by Henan Normal University's mutual aid group and social numbers on multiple walls, summarized the problems, and developed the "lost" WeChat applet. For college students, provide an information platform for information collection, resource sharing, and lost and found to help the owner find items that are important to him and provide convenience in life.