Online transaction becomes a main way of e-commerce at present. Information discovery and price discovery in e-commerce are realized in the platform mainly. This thesis presents an online transaction platform of interactive search after analyzing the research status of interactive search engine to solve the problem that buyers are hard to search seller information in this platform, bring the initiative of the sellers in principal part of trade into full play about using transaction platform, improving search efficiency and enhance VAS ability in transaction platform. The system has been implemented with .net technology and runs in campus network. Interactive search can be fulfilled using embedded search engine rather than using SQL trigger mechanism to raise search efficiency.