Though we already have several successful instances on gaming in library of China, powerful subjective reasons prohibited the development of game services since publicity, librarians and parents taking games as monsters. Also, public have no awareness of the game’s educational and social value. As a result, it is difficult to use game in entertainment, reading program and information literacy instruction. On the contrary, Libraries in US set up professional game librarians and consultants, and the game activities are in full swing. So it is quite necessary to analyze how they gradually overcome the prejudice and popularize game in library. And in this paper we will discuss the following factors: Service traditions, literacy, Library associations,education of future librarian.