There are many people to pay more attention to think tanks. The paper analyzes the development of the think tanks from the perspective of the whole world. By accessing the data from the database of ISI Web of Knowledge, we analyze the development of foreign think tanks, and through using the information visualization tools, the software of CiteSpace, we draw the knowledge map of current researching focus, the mapping of countries and educational institutions. We obtain the researching contents and methods of think tanks, and finally put forward suggestion to the development of domestic think tanks.