At present, 80% of more than 2,500 universities in China have subscribed to Elsevier database, and most universities spend more than 600,000 dollars every year. The total annual expenditure of the Chinese Academy of Sciences system for purchasing Elsevier products is more than 6 million dollars. As a result, Science Director has become one of the most frequently used databases by researchers in China, and has an irreplaceable position in other similar databases.