本文通过对相关文献的翻译与梳理,对不同时期美国公共图书馆的社会角色与服务定位进行了回顾与介绍,对未来公共图书馆的角色结合技术发展与社会期望进行了展望。 In this paper, we review and introduce the social roles and service orientation of American public libraries in different periods through the translation and combing of relevant documents. We expect the future development of public libraries and the expectation of society in the future.