In this paper, we demonstrate IP-Explorer, a semantic web based IP knowledge base and trading platform with the following characteristics: First, it is based on the semantic web technology; Second, it is built by mining the China High-Tech Fair(CHTF) database and the State Intellectual Property Office of PRC (SIPO) database; Third, "Smart Pushing" proactively pushes useful information based on user profiles, browsing and searching records, and activities of peers; Fourth, "IP family" collects IP’s from different industry sectors and integrate them as a "family", helping the user to broaden his horizon; Fifth, "Technology Roadmap" provides a visualization tool for decision makers to observe technology history and trends.