The Design and Realization of Secondhand Exchange System Based on B/S Abstract With the rapid development of science and information technology in recent years, Internet has greatly changed the aspect of almost every occupation of our lives. For the sake of network wildly been used, people can easily overcome the limitation of space and time to communication without going out of home. So what need us to do is to design a secondhand exchange system to achieve these goals. For this purpose, the thesis makes use of network programming and database to implement the system based on B/S model through comprehensive analysis and discuss which finally makes register user having a platform to issue resources and information. The system is developed according to software engineering, and asp and ACCESS 2000 is adopt to implement this system, which supply the storage and access data information. The thesis accomplishes the design of secondhand exchange system finally. By this system, we can conveniently exchange secondhand stuff. Key words: Database; Secondhand Exchange; B/S