In the United States, library associations represented by American Library Association play a vital role in the overall development of the libraries. Especially, the successful and rapid promotion of game service significantly showed the diverse ability and great energy of library associations. In order to reverse the attitude of librarians towards games, library associations at all levels have made multiple efforts on practice, research and guidance. This paper analyzes the various efforts of American Library Association, including branches of ALA on the successful promotion of game service. We found that comparing with other library systems, the extraordinary organizational characteristics and working mechanism of American Library Association brought to this success on marketing new services and enhancing social influence.